Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Classic & Vintage This forum is to discuss the many aspects of classic and vintage bicycles, including musclebikes, lightweights, middleweights, hi-wheelers, bone-shakers, safety bikes and much more.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 09-29-11, 04:14 AM   #1
uprightbent
Senior Member
Thread Starter
 
Join Date: Aug 2005
Location: Washington DC area
Bikes:
Posts: 253
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Anyone regret going the 650B route?

Sure there's lot of praise for the wider tire ride at lower pressures, and the seemingly perfect in between size of the 650B. Of course finding one to test-ride is another story. I'm tempted to build a VO Polyvalent but I'm wondering if others have done the same only to retreat back to their 28mm tires or similar? Was it not what everyone said it would be?

Besides a conversion, which can obviously be tricky with brakes, and Kogswell out of business, my 650 "test" frame options seem limited.
uprightbent is offline   Reply With Quote
Old 09-29-11, 04:44 AM   #2
JunkYardBike
Since 1938...
 
JunkYardBike's Avatar
 
Join Date: Aug 2006
Location: Northwestern NJ
Bikes:
Posts: 6,208
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
no
JunkYardBike is offline   Reply With Quote
Old 09-29-11, 04:50 AM   #3
JunkYardBike
Since 1938...
 
JunkYardBike's Avatar
 
Join Date: Aug 2006
Location: Northwestern NJ
Bikes:
Posts: 6,208
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
http://www.rawlandcycles.com/store/i...intItemID=3953
http://www.renehersebicycles.com/Randonneur%20bikes.htm

I don't think a conversion is all the complicated. Just find brakes with long enough reach - they're out there. Search the web and find what frames people have successfully used.

That being said, I don't find the ride of my 650B Kogswell radically different from my 700x32c Trek TX500. It's a bit more cushy and the Hetres tires do feel a bit quicker than the 32c Paselas. Also, the 42mm Hetres are a little more forgiving on rough pavement and gravel. It's more of a luxury to me than a necessity. I could live without the 650b. But I don't regret building it up and I enjoy riding it. It's my 'A' ride now.

Last edited by JunkYardBike; 09-29-11 at 04:54 AM.
JunkYardBike is offline   Reply With Quote
Old 09-29-11, 06:36 AM   #4
bikamper
Senior Member
 
Join Date: Nov 2009
Location: E. Dundee, IL
Bikes: 1954 Robin Hood, 1964 Dunelt, 1968 Raleigh Superbe, 1969 Robin Hood, 197? Gitane, 1973 Raleigh SuperCourse, 1981 Miyata 710, 1990 Miyata 600GT, 2007 Rivendell Bleriot
Posts: 427
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I gotta say no, also. I find the ride on my Bleriot to be really comfortable, if a tad bit slower. I commute and tour so speed is not of the essence. I'm running 40-something Col Di Vies. If there is a regret, it's that the Bleriot is too nice for what I use it for.

There are always drum and disc brakes, too. I run drums on the above.
bikamper is offline   Reply With Quote
Old 09-29-11, 06:51 AM   #5
clubman 
Youngman Grande
 
clubman's Avatar
 
Join Date: Jan 2010
Location: Nova Scotia
Bikes: roadsters, club bikes, fixed and classic
Posts: 2,955
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 18 Post(s)
I did some heavy touring with a C-dale T1000 that came stock with (700c) 38 mm Conti Top Touring tires and Ritchey Rock rims pumped to 85 psi. I didn't like them with a full load and "retreated" to 28 mm. This isn't specific to 650Bs, just wide tires.

Otherwise I'd love to try 650B's on an English Sports bike if they'd fit.
clubman is offline   Reply With Quote
Old 09-29-11, 09:09 AM   #6
Catnap
zungguzungguguzungguzeng
 
Catnap's Avatar
 
Join Date: Jun 2008
Location: Williamsburg, Brooklyn
Bikes: Zunow, Jo Routens, Bridgestone, Mercier, Cannondale
Posts: 1,227
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i have a Surly Long Haul Trucker that has 26" wheels on it, and I recently went from 1.5" tires to 2" ones. Surprisingly, it felt "faster" with the wider tires! Not sure if this translates to 650B but it went a long way towards validating Jan Heine's claims about wide tires being faster, in my mind at least.
Catnap is offline   Reply With Quote
Old 09-29-11, 09:41 AM   #7
JunkYardBike
Since 1938...
 
JunkYardBike's Avatar
 
Join Date: Aug 2006
Location: Northwestern NJ
Bikes:
Posts: 6,208
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Catnap View Post
i have a Surly Long Haul Trucker that has 26" wheels on it, and I recently went from 1.5" tires to 2" ones. Surprisingly, it felt "faster" with the wider tires! Not sure if this translates to 650B but it went a long way towards validating Jan Heine's claims about wide tires being faster, in my mind at least.

There are fast wide tires, and there are slow wide tires. There are fast narrow tires, and there are slow narrow tires. Generally, the higher the thread count and the more expensive the tire, the faster it will feel.
JunkYardBike is offline   Reply With Quote
Old 09-29-11, 01:38 PM   #8
Captain Blight
Senior Member
 
Captain Blight's Avatar
 
Join Date: Oct 2009
Location: Minneapolis
Bikes: -1973 Motobecane Mirage -197? Velosolex L'Etoile -'71 Raleigh Super Course
Posts: 2,473
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'm strongly considering doing this for my VeloSoleX, because I just plain do not have room for fenders with 700Cx28s. I *had* had a set of Airweights on it, but I put on a V-O front rack and now there's about 2mm of room between the daruma nut and the tire. I suppose that what's stopping me is the very few tires available, though the ones that are seem to be very good indeed. I dunno.

So does old French frame+Nuovo Tip0 Hubs+Cr-18s+Grand Bois+Airweights=Hotness?
Captain Blight is offline   Reply With Quote
Old 09-29-11, 01:41 PM   #9
ColonelJLloyd 
Senior Member
 
ColonelJLloyd's Avatar
 
Join Date: Dec 2009
Location: Louisville
Bikes:
Posts: 8,218
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Quote:
Originally Posted by Captain Blight View Post
... but I put on a V-O front rack and now there's about 2mm of room between the daruma nut and the tire.
I feel like I've already explained it to you, but you can get more clearance there with the "nut" from a seatpost binder or recessed brake. If that doesn't sound familiar and you'd like to know more send me an email.

And, yes, your math looks correct to me.
__________________
Bikes on Flickr
I prefer email to private messages. You can contact me at justinhughes@me.com
ColonelJLloyd is offline   Reply With Quote
Old 09-29-11, 02:16 PM   #10
bionnaki
Senior Member
 
Join Date: Aug 2006
Bikes:
Posts: 886
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I know someone that did a 650b conversion. the bb drop that resulted was too low.

I prefer, for various reasons, a fat tire 700c in the 32-38mm range. The difference between this and a 650b bicycle is subtle, imho. An easier conversion is 27" to 700c, but if your measurements are in the acceptable range for a 700c to 650b conversion (and your brakes will work or if you dont mind taking the frame/fork to a framebuilder for modification), go for it.

I dont think "regret" is common if things are done right...I think "underwhelmed" would be more common particularly in the face of so many reports of 650b being the greatest thing ever...like riding on magical marshmellows. I think wide tires and low psi are great, but they're not that great. Keep expectations healthy and on this side of reality, and you'll be very pleased.

Personally (and perhaps this is controversial in the C&V forum), but I think if the major tire manufacturers put a little research and development into 650b tires...or have the tech/research/knowledge of compounds trickle over from their high-end 700c offerings...then things can get awesome. The current state of available 650b tires is still on the basic, low-end (i.e. Panaracer built tires). People love Panaracer tires just fine, but their tires simply are not on par with the offerings of Schwalbe, Continental, Michelin, and Vittoria.

Last edited by bionnaki; 09-29-11 at 02:34 PM.
bionnaki is offline   Reply With Quote
Old 09-29-11, 05:13 PM   #11
MrEss
likes to ride an old bike
 
Join Date: Dec 2010
Location: Madison
Bikes:
Posts: 673
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
From the tires I've inspected, I don't feel like Panaracer isn't lagging behind other tire manufacturers in tech level at all. On the contrary, they seem to be better at making non-handmade tires than anyone else.

The corners the MFR has to cut to make price point seem to be the biggest defining characteristics of every tire except the very top-end. Once you're there, it's the tradeoffs between fast and tough, sticky and long-wearing.
MrEss is offline   Reply With Quote
Old 09-29-11, 05:25 PM   #12
bobbycorno
Senior Member
 
bobbycorno's Avatar
 
Join Date: Sep 2007
Bikes:
Posts: 2,544
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by bionnaki View Post
I know someone that did a 650b conversion. the bb drop that resulted was too low.

I prefer, for various reasons, a fat tire 700c in the 32-38mm range. The difference between this and a 650b bicycle is subtle, imho. An easier conversion is 27" to 700c, but if your measurements are in the acceptable range for a 700c to 650b conversion (and your brakes will work or if you dont mind taking the frame/fork to a framebuilder for modification), go for it.

I dont think "regret" is common if things are done right...I think "underwhelmed" would be more common particularly in the face of so many reports of 650b being the greatest thing ever...like riding on magical marshmellows. I think wide tires and low psi are great, but they're not that great. Keep expectations healthy and on this side of reality, and you'll be very pleased.

Personally (and perhaps this is controversial in the C&V forum), but I think if the major tire manufacturers put a little research and development into 650b tires...or have the tech/research/knowledge of compounds trickle over from their high-end 700c offerings...then things can get awesome. The current state of available 650b tires is still on the basic, low-end (i.e. Panaracer built tires). People love Panaracer tires just fine, but their tires simply are not on par with the offerings of Schwalbe, Continental, Michelin, and Vittoria.
Yeah, I'd LOVE to have Michelin Pros in 650x38c, but doubt that I'll see 'em in this lifetime.

I've tried both 650x38b and 700x35c, and (at least in part due to differences in the respective bikes) came down on the side of 650b. IME, there's a not so subtle difference in feel between the two. Ride quality and cornering are pretty much indistinguishable, but the 650b's seem to "spin up" faster, even with essentially the same wheel/tire weight. My theory is that it has to do with how far the weight is from the wheel center: the smaller the distance, the easier it is to accelerate (and decelerate). Anyway, I like the 650b's well enough that I'm selling the 700c bike, and the 650b bike is my every-day ride.

(And I spose I should say, the comparision was between Panaracer Paselas in 700x35c and 650x38c Soma B-Sides, which are essentially a 650b, folding bead Pasela. So pretty much identical tires, other than diameter.)

SP
Bend, OR
bobbycorno is offline   Reply With Quote
Old 09-29-11, 05:32 PM   #13
mudboy
Senior Member
 
mudboy's Avatar
 
Join Date: Sep 2008
Location: Collegeville, PA
Bikes: Ruckelshaus Randonneur, Specialized Allez (early 90's, steel), Ruckelshaus Path Bomber currently being built
Posts: 1,354
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
650b. I just wish there were more rim options, especially at the lower end.
mudboy is offline   Reply With Quote
Old 09-29-11, 07:11 PM   #14
sillygolem
No Money and No Sense
 
sillygolem's Avatar
 
Join Date: Sep 2010
Location: Anderson, MO
Bikes:
Posts: 707
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Why 650b over 26"? Is this more of a fit issue for a 700c bike?
sillygolem is offline   Reply With Quote
Old 09-29-11, 07:48 PM   #15
-holiday76
No one cares
 
-holiday76's Avatar
 
Join Date: Jan 2008
Location: Yardley, Pa
Bikes:
Posts: 5,600
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
i'm converting all of my bikes to 650b or selling the ones that can't be converted.
__________________
I prefer emails to private messages - holiday76@gmail.com
Jack Taylor Super Tourist, Jack Taylor Super Tourer Tandem, Jack Taylor Tour of Britain, Px-10, Carlton Flyer,Fuji The Finest, Bianchi Squadra,Salsa Fargo, Santa Cruz Tallboy, Cetma Largo, Riv Betty Foy (wife's), Gitane 500A Mini Racer (sons).
-holiday76 is offline   Reply With Quote
Old 09-29-11, 07:49 PM   #16
southpawboston 
Senior Member
 
southpawboston's Avatar
 
Join Date: Aug 2008
Location: Somerville, MA and Catskill Mtns
Bikes:
Posts: 4,008
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My only regret in going down the 650B route is that I hadn't bothered to have my fork re-raked when I did a full-blown conversion. But this has everything to do with the bike's geometry and nothing to do with 650B wheels versus 700C/27". Converting transformed the bike in a very good way, but it could have been even more of a gem had I gone the extra mile.

Quote:
Originally Posted by sillygolem View Post
Why 650b over 26"? Is this more of a fit issue for a 700c bike?
Yes. 650B allows you to convert a 700C road bike while keeping the original geometry the same (except for a slight drop in height). 26" is too far of a leap for a frame designed for 700C wheels.
__________________
Velo Lumino - Lighting components and integration solutions for fine hand-built and classically inspired bicycles

Riding the Catskills blog

Flickr

1971 Mercian Olympic | 1972 Jeunet 630 | 1982 Jack Taylor Tour of Britain | 1984 Shogun 1500 650B | 2013 Rawland Stag | 2014 Jeff Lyon L'Avecaise | 2015 Bike Friday Haul-a-Day
southpawboston is offline   Reply With Quote
Old 09-29-11, 08:11 PM   #17
RJM
I'm doing it wrong.
 
RJM's Avatar
 
Join Date: Jun 2009
Bikes:
Posts: 4,532
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 91 Post(s)
Can't say I have regretted going with 650b wheels, I am a shorter than average dude at 5'5" and the smaller wheels seem to work better with my dimensions for the most part. I have a Sam Hillborne in 650b and love it, way nice riding with my super duper expensive wheelset with Pari-Motos on it, much better on the road than the Fatty Rumpkins that I had used. I had Riv build me a set of wheels with their Phil "Rivy" 7 speed freewheel hubs laced to Velocity Dyad Rims and the choice was a good one. I have to stick with the freewheel thing though, but I thought it was totally worth it, and it is. Using those wheels with the Pari-Motos feels better than riding 700x25's on my other bikes, cushier, more responsive and faster if you can believe it. I feel better about some of the really bad roads that I ride through all the time with the wider tires and tough rims.

I don't know if I have a frame currently that would work well converted to 650b, I don't see any reason to go to a smaller diameter wheel if I can't get a tire at least 38mm wide in there, and my current bikes really don't work for that, the few that I could use are too narrow at the chainstay. Maybe in the future I should look for one, it would be a fun project and I have a spare set of wheels.

Quote:
i'm converting all of my bikes to 650b or selling the ones that can't be converted.
Awesome!

Last edited by RJM; 09-29-11 at 08:18 PM.
RJM is offline   Reply With Quote
Old 09-29-11, 09:41 PM   #18
noglider 
aka Tom Reingold
 
noglider's Avatar
 
Join Date: Jan 2009
Location: West Village, New York City
Bikes: too many
Posts: 26,875
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 94 Post(s)
Quote:
Originally Posted by sillygolem View Post
Why 650b over 26"? Is this more of a fit issue for a 700c bike?
650b is 26" but remember there are many different 26" specs. 650b is just one of them. See http://sheldonbrown.com/26.html for complete information.

650c is uncommon and seems to be racing oriented. I've only seen very narrow tires in that size. 650a is the same as wheels that came on English 3-speeds and many other bikes. Rim and tire selection isn't very good. 650b has some excellent rims and tires available. Unfortunately for me, they're all pretty expensive, so I won't be doing 650b conversions any time soon.

JunkYardBike, it's not that conversion is complicated, it's that it's expensive. And wait a sec. It can be complicated. Sometimes brakes actually are hard to fit, depending on the situation. And you better make a prediction about BB height or you get a pretty lousy bike. The 70's Raleighs have some low BB's.


Quote:
Originally Posted by -holiday76
i'm converting all of my bikes to 650b or selling the ones that can't be converted.
Pay attention to this silly man. He never says anything he means.

Clubman, it's possible you overinflated those tires, which would explain your dissatisfaction. Or maybe they were just crappy tires. I don't know about those.

Quote:
Originally Posted by bionnaki
I think "underwhelmed" would be more common particularly in the face of so many reports of 650b being the greatest thing ever...like riding on magical marshmellows. I think wide tires and low psi are great, but they're not that great. Keep expectations healthy and on this side of reality, and you'll be very pleased.
Maybe, but when I took a very short test ride on Zaphod Beeblebrox's 650b bike, I was totally amazed. He has the Hetres on it.

Quote:
Personally (and perhaps this is controversial in the C&V forum), but I think if the major tire manufacturers put a little research and development into 650b tires...or have the tech/research/knowledge of compounds trickle over from their high-end 700c offerings...then things can get awesome. The current state of available 650b tires is still on the basic, low-end (i.e. Panaracer built tires). People love Panaracer tires just fine, but their tires simply are not on par with the offerings of Schwalbe, Continental, Michelin, and Vittoria.
To each his own. Panaracer are my favorite tires, and they've been among my favorites for about 30 years. Every brand makes some excellent tires, but the amazing thing with Panaracers is that even their low end tires are pretty darned nice. I recently rode an old Schwinn with original Schwinn-branded tires made by Panaracer. Very impressive.

Also, many years ago, I had some Panaracer tubular tires. At the time, I think they were the only tubulars made with nylon casings rather than cotton or silk. The ride was excellent, the price was super-excellent, and so was the durability. I think a lot of Panaracer tires don't get respect because their prices are too low.
__________________
Tom Reingold, noglider@pobox.com
New York City and High Falls, NY
Blogs: The Experienced Cyclist; noglider's ride blog

Please email me rather than PM'ing me. Thanks.
noglider is offline   Reply With Quote
Old 09-30-11, 06:03 AM   #19
tcs
Palmer
 
tcs's Avatar
 
Join Date: Mar 2007
Location: Parts unknown
Bikes:
Posts: 4,692
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 16 Post(s)
Quote:
Originally Posted by noglider View Post
650c is uncommon and seems to be racing oriented. I've only seen very narrow tires in that size.
Actually, there are two different and non-interchangeable 650C (bead seat diameter 571mm) tire sizes: the time trial/small frame road bike 650C tires, that are, oh, round about 1" wide, and the original semi-balloon 650C size which we call in America 26x 1 3/4.

Quote:
650a is the same as wheels that came on English 3-speeds and many other bikes. Rim and tire selection isn't very good.
Here are the 650A (a.k.a. 26 x 1 3/8 a.k.a. EA3 a.k.a. ISO590) tires I found available when I looked last, around 6 months ago:

Bell Sports Streetster (folding)
Chengshin C638
Continental City Ride
Hutchinson Junior
Innova Cloud Nine
IRC Super Gold
IRC Super Seed
IRC City POPS
Kenda gumwall
Kenda Cross (knobby)
Kenda K40 Street
Michelin World Tour
Nutrak Traditional
Nu-teck (airless)
Panaracer Col de Vie
Panaracer Passhunter (light knobby)
Panaracer ST Daily Commuting
Pyramid gumwall
Pyramid Sunlite Hybrid Nimbus
Raleigh Record
Rubena Flash V66
Schwalbe Delta Cruiser (available in cream color)
Schwalbe Marathon
Schwalbe Marathon Plus
Schwalbe Speedway Pro (knobby)
Specialized TriSport
Vittoria Randonneur
Vredestein Perfect Tour
Vredestein Dynamic Tour
Vredestein Classic

I've never had a problem finding rims for ISO590mm.

Last edited by tcs; 09-30-11 at 06:13 AM.
tcs is offline   Reply With Quote
Old 09-30-11, 07:02 AM   #20
noglider 
aka Tom Reingold
 
noglider's Avatar
 
Join Date: Jan 2009
Location: West Village, New York City
Bikes: too many
Posts: 26,875
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 94 Post(s)
tcs, other than the Col de la Vie, is any of those tires light weight and pleasant to ride? And are these various tires actually available? Not all the sizes made are available in the US.

And is there a good selection of rims? The Sun CR-18 is a nice rim, but is there something else that's as good or better?
__________________
Tom Reingold, noglider@pobox.com
New York City and High Falls, NY
Blogs: The Experienced Cyclist; noglider's ride blog

Please email me rather than PM'ing me. Thanks.
noglider is offline   Reply With Quote
Old 09-30-11, 07:11 AM   #21
devinfan
Senior Member
 
devinfan's Avatar
 
Join Date: Aug 2006
Location: Toronto, Ontario
Bikes:
Posts: 1,714
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Not too sure about this whole conversion thing. I guess I'll have to ride one and see, but I'm really having trouble seeing how there could be that big a difference between wide 27" or 700C tires or 26" for that matter. Or maybe I'll step off the bike with crazy 650b diameter irises and say "Now I understand!" My concern is that 650b is yet another fad that will end up seeing a bunch of beautiful old road bikes turned into something they weren't meant to be. Surely that happened enough already with the fixie craze. On the upside, maybe people could take all those drewed fixie frames, add canti mounts and turn them into 650B's, or 6-fixie-B's, or...
devinfan is offline   Reply With Quote
Old 09-30-11, 07:18 AM   #22
unterhausen
Randomhead
 
Join Date: Aug 2008
Location: Happy Valley, Pennsylvania
Bikes:
Posts: 14,533
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Quote:
Originally Posted by devinfan View Post
Not too sure about this whole conversion thing. I guess I'll have to ride one and see, but I'm really having trouble seeing how there could be that big a difference between wide 27" or 700C tires or 26" for that matter.
650b makes larger tire sizes less of a problem on smaller frames. And a big 700c requires compromises on the chainstays.

Quote:
Originally Posted by noglider View Post
And is there a good selection of rims? The Sun CR-18 is a nice rim, but is there something else that's as good or better?
there are the Velocity Dyad and Synergy

Last edited by unterhausen; 09-30-11 at 07:22 AM.
unterhausen is offline   Reply With Quote
Old 09-30-11, 07:39 AM   #23
ColonelJLloyd 
Senior Member
 
ColonelJLloyd's Avatar
 
Join Date: Dec 2009
Location: Louisville
Bikes:
Posts: 8,218
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Quote:
Originally Posted by unterhausen View Post
there are the Velocity Dyad and Synergy
Tom was speaking of ISO 590, not 584. Those rims aren't made in the 590 size, I don't think.

Tom is correct. The CR-18 and Col de la Vie are pretty much the best you can do in 650a (ISO 590). You can do better in 650b (ISO 584)/
__________________
Bikes on Flickr
I prefer email to private messages. You can contact me at justinhughes@me.com
ColonelJLloyd is offline   Reply With Quote
Old 09-30-11, 07:45 AM   #24
devinfan
Senior Member
 
devinfan's Avatar
 
Join Date: Aug 2006
Location: Toronto, Ontario
Bikes:
Posts: 1,714
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
[QUOTE=unterhausen;13299050]650b makes larger tire sizes less of a problem on smaller frames. And a big 700c requires compromises on the chainstays.

My Atala has plenty of room for 32's. I haven't bothered trying but I'm pretty sure my Cinelli B does as well, and I don't see any compromises there. I usually ride 21's so 32 sounds pretty darn big to me, but maybe you guys are in another league.
devinfan is offline   Reply With Quote
Old 09-30-11, 07:45 AM   #25
rhm
multimodal commuter
 
rhm's Avatar
 
Join Date: Nov 2006
Location: NJ, NYC, LI
Bikes: 1940s Fothergill, 1959 Allegro Special, 1963? Claud Butler Olympic Sprint, Lambert 'Clubman', 1974 Fuji "the Ace", 1976 Holdsworth 650b conversion rando bike, 1983 Trek 720 tourer, 1984 Counterpoint Opus II, 1993 Basso Gap, 2010 Downtube 8h, and...
Posts: 15,669
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 34 Post(s)
Quote:
Originally Posted by southpawboston View Post
My only regret in going down the 650B route is that I hadn't bothered to have my fork re-raked when I did a full-blown conversion. But this has everything to do with the bike's geometry and nothing to do with 650B wheels versus 700C/27". Converting transformed the bike in a very good way, but it could have been even more of a gem had I gone the extra mile.



Yes. 650B allows you to convert a 700C road bike while keeping the original geometry the same (except for a slight drop in height). 26" is too far of a leap for a frame designed for 700C wheels.
What would you have done to the fork, if you'd gone the extra mile? I understand that mechanical trail is a function of wheel diameter, head tube angle, and fork offset, so changing any one of those will change mechanical trail. But changing fork offset will also change head tube angle, as well as every other related angle. Does anyone have their fork re-raked when they change their tires?

It seems to me it must come down to a question of exactly how much is "a slight drop in height"?

As I understand, the following tires in theory all have the same outside diameter (660 mm):

38 x 650B (26 x 1 1/2)
35 x 650A (26 x 1 3/8)
19 x 700c

Of course a fatter 700c tire will change the wheel size, and therefore BB height etc; 23 x 700c would bring the diameter up 8 mm, 32 x 700c would bring it up 26 mm, and so on. But all these changes are within the range of tire sizes commonly available for 700c rims.
rhm is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 12:57 PM.