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 11-29-07, 04:21 PM   #1
Sammyboy
The Legitimiser
Thread Starter
 
Sammyboy's Avatar
 
Join Date: Jul 2005
Location: Southampton, UK
Bikes: Gazelle Trim Trophy, EG Bates Track Bike, HR Bates Cantiflex bike, Nigel Dean fixed gear conversion, Raleigh Royal, Falcon Westminster.
Posts: 4,847
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
From 27" to 26"

While my Raleigh 20 is off the road, I've been commuting on my Raleigh tourer, and the tyres are just not coping. I'm running 27 x 1 1/4 tyres at 100 psi, and every time I ride it across London, I get a flat. So, whilst I won't be commuting on this forever, it appears that when you've got my 240 lbs, plus a heavy load on the rack, I need some cushier tyres. Trouble is, you just don't GET bigger tyres in 27".

So, I have a pair of medium width 26" rims with cassette hubs which I could throw on there, and then use Schwalbe Big Apples. I realize that the brake reach is going to be seriously different (going from 630 to 559, that's what, 69mm different?), and I'm not sure that's at all feasible. Has anyone tried this? I can get some long reach calipers, 75mm reach, but it strikes me that might not be enough. What are my options? I'm asking here because it's an 80's bike, and because you guys have tried all sorts of things.....
Sammyboy is offline   Reply With Quote
Old 11-29-07, 05:04 PM   #2
well biked 
biked well
 
well biked's Avatar
 
Join Date: Jul 2005
Bikes:
Posts: 7,065
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
To use the 559 rims and have the brakes reach, you'll need to be able to adjust the pads down approximately another 35mm (35.5mm is the difference in radius between ISO 630 rims and ISO 559 rims). That's a LOT of additional reach, I doubt you'll find brakes that would do it. What you need to do is measure from the center of the brake mount bolt down to the center of the 27" rims, and then add 35mm. That's how much reach you need to have the brakes reach the ISO 559 rims.
well biked is online now   Reply With Quote
Old 11-29-07, 05:08 PM   #3
GCRyder
Senior Member
 
Join Date: Jul 2006
Location: Tucson AZ
Bikes:
Posts: 584
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Sheldon Brown has an article on his site about using a "drop bolt" to get needed brake reach for the kind of conversion you're contemplating. It's not very elegant, to say the least. I don't think I'd go that route myself, but it is a solution.

Are you getting pinch flats, or punctures?
GCRyder is offline   Reply With Quote
Old 11-29-07, 05:11 PM   #4
tricky
Senior Member
 
Join Date: Oct 2005
Location: Upper Left, USA
Bikes:
Posts: 411
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Disc brakes?
tricky is offline   Reply With Quote
Old 11-29-07, 05:19 PM   #5
arborohs
Senior Member
 
Join Date: Jan 2007
Location: Walnut, CA
Bikes:
Posts: 174
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
which tires have you tried? I use kendas and I think michelin makes a wide 27" tire. Don't know about the michelins but the kendas are dirt cheap.
arborohs is offline   Reply With Quote
Old 11-29-07, 05:41 PM   #6
el twe
crotchety young dude
 
el twe's Avatar
 
Join Date: Jan 2005
Location: SF, CA
Bikes: IRO Angus; Casati Gold Line; Redline 925; '72 Schwinn Olympic Paramount
Posts: 4,818
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
You may be able to find a 27x1 1/4" knobby tire, but it would only be marginally wider. A drop bolt sounds like to best solution.
__________________
Quote:
Originally Posted by CardiacKid View Post
I explained that he could never pay me enough cash for the amount of work I had put into that bike and the only way to compensate me for it was to ride the hell out of it.
IRO Angus Casati Gold Line
el twe is offline   Reply With Quote
Old 11-29-07, 05:50 PM   #7
Bill Kapaun
Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
Posts: 9,198
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Maybe 590 or 597MM rims (26x1-3/8")? At least you would be closer!
OR 700C rims? I think you can find some 29er tires. Brakes would probably fit OK too.
Bill Kapaun is offline   Reply With Quote
Old 11-29-07, 06:34 PM   #8
maureenkh
Senior Member
 
Join Date: Aug 2007
Bikes:
Posts: 139
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
http://sheldonbrown.com/harris/tires/630.html

This page at Harris Cyclery shows two knobby 27 X 1-3/8 tires that might work. One is the "Cross Terra" by Club Roost and the other is the "Tufflex" by Panaracer.

Maureen
maureenkh is offline   Reply With Quote
Old 11-29-07, 06:44 PM   #9
SteakKnifeSally
Senior Member
 
SteakKnifeSally's Avatar
 
Join Date: Feb 2006
Bikes: 200x Coppi w DuraAce 9, 82 Schwinn Voyager 11.2, 2004 DeBernardi Track, 83 Centurion Elite RS, and some others.
Posts: 262
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Unfortunately, the original link is no longer live, because the pictures of a sports with 700c wheels was great, but this cached version captures the text.

Link keeps getting chopped, so google 3 speed update and hit the cached link. Hope it helps.
SteakKnifeSally is offline   Reply With Quote
Old 11-29-07, 10:09 PM   #10
jgedwa
surly old man
 
jgedwa's Avatar
 
Join Date: Sep 2006
Location: Carlisle, PA
Bikes: IRO Mark V, Karate Monkey half fat, Trek 620 IGH, Cannondale 26/24 MTB, Amp Research B3, and more.
Posts: 3,345
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
The real problem may be pedal strike since the bottom bracket is so low. I built up a bike for my gf that involved replacing the original 700's with 26 in tires. The pedals are VERY low. She is riding it now and there have been no problems, and I am keeping my fingers crossed. I could put shorter crank arms on, and maybe find pedals that do not stick out so far, if there is a problem with it.

jim
jgedwa is offline   Reply With Quote
Old 11-29-07, 10:13 PM   #11
cooker
Prefers Cicero
 
cooker's Avatar
 
Join Date: Jul 2005
Location: Toronto
Bikes: 1984 Trek 520; 1990s Peugeot (Canadian-made) rigid mountain bike; 2007 Bike Friday NWT; misc others
Posts: 10,231
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 134 Post(s)
Get a beater mountain bike
cooker is offline   Reply With Quote
Old 11-30-07, 01:30 AM   #12
Sammyboy
The Legitimiser
Thread Starter
 
Sammyboy's Avatar
 
Join Date: Jul 2005
Location: Southampton, UK
Bikes: Gazelle Trim Trophy, EG Bates Track Bike, HR Bates Cantiflex bike, Nigel Dean fixed gear conversion, Raleigh Royal, Falcon Westminster.
Posts: 4,847
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'm not buying a mountain bike! I could go to 700c wheels - to be honest, the only reason for running the 26'ers is that I have a set. I don't think the BB clearance would be SUCH an issue, since with the big, fat tyres I have in mind, the actual rolling diameter would be a lot closer to the original 27"ers. I need to measure my brake reach.
Sammyboy is offline   Reply With Quote
Old 11-30-07, 03:48 AM   #13
cs1
Senior Member
 
cs1's Avatar
 
Join Date: Feb 2004
Location: Clev Oh
Bikes: Specialized, Schwinn
Posts: 6,651
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Quote:
Originally Posted by Sammyboy View Post
I'm not buying a mountain bike! I could go to 700c wheels - to be honest, the only reason for running the 26'ers is that I have a set. I don't think the BB clearance would be SUCH an issue, since with the big, fat tyres I have in mind, the actual rolling diameter would be a lot closer to the original 27"ers. I need to measure my brake reach.
You're forgetting about BB clearance. Those 26" wheels are going to drop the bike significantly. Your cranks will be a lot closer to bottoming out on the pavement. That's a bad thing. Why not try 650B?

Tim
cs1 is offline   Reply With Quote
Old 11-30-07, 12:04 PM   #14
Sammyboy
The Legitimiser
Thread Starter
 
Sammyboy's Avatar
 
Join Date: Jul 2005
Location: Southampton, UK
Bikes: Gazelle Trim Trophy, EG Bates Track Bike, HR Bates Cantiflex bike, Nigel Dean fixed gear conversion, Raleigh Royal, Falcon Westminster.
Posts: 4,847
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by cs1 View Post

Quote:
Originally Posted by Sammyboy
I don't think the BB clearance would be SUCH an issue, since with the big, fat tyres I have in mind, the actual rolling diameter would be a lot closer to the original 27"ers.

You're forgetting about BB clearance. Those 26" wheels are going to drop the bike significantly. Your cranks will be a lot closer to bottoming out on the pavement. That's a bad thing. Why not try 650B?

Tim
I think you didn't read my response. I'm not forgetting BB clearance, I just suspect that it won't be an issue with Big Apples, cos they're enormous. I wouldn't got to 650c because of tyre availability - I don't know how easy it would be to get cushy ones, even online, but I KNOW I can't get them at the LBS. The only reason for considering 26" is that I have a wheelset on hand which will cost me nothing. Otherwise, 700c is the obvious choice, but that just means I can't do it for a while. The 26" solution could happen immediately.
Sammyboy is offline   Reply With Quote
Old 11-30-07, 01:11 PM   #15
fritz1255
Senior Member
 
Join Date: May 2005
Location: SE Pennsylvania
Bikes: Vintage French road bikes, older "rescue" mountain bikes
Posts: 200
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I think you would be going from 630 to 590, or 20mm of radius. Might work just fine with the wheels and brakes that you have. Can't hurt to try. I have done this before, when my 27" got a flat, and it worked (one 26" wheel, one 27"). I can't imagine that 20 mm is going to make any difference in pedal clearance. Not sure how one could work the pedals at all if the bottom bracket were close enough to the ground to scrape.......
fritz1255 is offline   Reply With Quote
Old 11-30-07, 01:14 PM   #16
well biked 
biked well
 
well biked's Avatar
 
Join Date: Jul 2005
Bikes:
Posts: 7,065
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Quote:
Originally Posted by fritz1255 View Post
I think you would be going from 630 to 590, or 20mm of radius.
But Sammyboy has 26" mtb wheels, they're 559-
well biked is online now   Reply With Quote
Old 11-30-07, 05:54 PM   #17
syc
Junior Member
 
Join Date: Aug 2006
Bikes:
Posts: 17
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Even if you could get brake calipers that long, it would be a bad idea. You're extending the brake arms by 35mm, which means theres going to be a lot more leverage against the arms. They'll be really flexy and provide poor braking under that kind of leverage. I'm also not sure you could pick up brakes that are long enough to get around a big apple and reach the addition 35mm.

Do you think that Conti Gatorskins in 27 x 1 1/4 would be tough enough for your riding? According to the Harris Cyclery website, they're only about 28mm wide though. They also like the Schwalbe Marathon in that size, and those are pretty durable tires.
syc is offline   Reply With Quote
Old 11-30-07, 07:10 PM   #18
Grand Bois
Senior Member
 
Grand Bois's Avatar
 
Join Date: Mar 2005
Location: Pinole, CA, USA
Bikes:
Posts: 16,568
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 31 Post(s)
The Panaracer 27X1 3/8 Tufflex tire and some heavy duty tubes seems like the best solution to me. You can get them from any shop that can order from the QBP catalog.
Grand Bois is offline   Reply With Quote
Old 11-30-07, 07:37 PM   #19
ollo_ollo
Senior Member
 
ollo_ollo's Avatar
 
Join Date: Nov 2003
Location: Near Sublimity Orygun
Bikes: Still have a few left!
Posts: 3,537
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
While commuting to work(in Olympia, WA) a few Summers ago, I chatted with a guy who rode out from a homeless camp on an 80's road bike which had a pair of 26" mountain bike wheels retrofitted. For braking, he had removed the pads & the calipers just clamped down on the sidewall of the tires. I asked him how well they stopped?? He said "OK if you keep the speed down". (This wasn't a great solution but at least someone has put MB wheels on a road bike).

Last edited by ollo_ollo; 11-30-07 at 09:33 PM.
ollo_ollo is offline   Reply With Quote
Old 11-30-07, 07:41 PM   #20
el twe
crotchety young dude
 
el twe's Avatar
 
Join Date: Jan 2005
Location: SF, CA
Bikes: IRO Angus; Casati Gold Line; Redline 925; '72 Schwinn Olympic Paramount
Posts: 4,818
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Do NOT do that. You're gonna destroy your tires.
__________________
Quote:
Originally Posted by CardiacKid View Post
I explained that he could never pay me enough cash for the amount of work I had put into that bike and the only way to compensate me for it was to ride the hell out of it.
IRO Angus Casati Gold Line
el twe is offline   Reply With Quote
Old 11-30-07, 09:31 PM   #21
ollo_ollo
Senior Member
 
ollo_ollo's Avatar
 
Join Date: Nov 2003
Location: Near Sublimity Orygun
Bikes: Still have a few left!
Posts: 3,537
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Like I said, "wasn't a great solution", but I wonder how long it would take to wear through the tire? I did see the guy & his bike around town throughout that Summer. He was usually riding slightly above walking speed.
ollo_ollo is offline   Reply With Quote
Old 11-30-07, 11:46 PM   #22
el twe
crotchety young dude
 
el twe's Avatar
 
Join Date: Jan 2005
Location: SF, CA
Bikes: IRO Angus; Casati Gold Line; Redline 925; '72 Schwinn Olympic Paramount
Posts: 4,818
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I've seen a hole ripped in a sidewall from not even a week of riding like that.
__________________
Quote:
Originally Posted by CardiacKid View Post
I explained that he could never pay me enough cash for the amount of work I had put into that bike and the only way to compensate me for it was to ride the hell out of it.
IRO Angus Casati Gold Line
el twe is offline   Reply With Quote
Old 12-01-07, 03:03 AM   #23
g-funk
Senior Member
 
g-funk's Avatar
 
Join Date: Aug 2007
Location: Annadel
Bikes:
Posts: 565
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I'd invest in some technique. that said I tried to ride a bike in london and gave up in about 10 seconds.
g-funk is offline   Reply With Quote
Old 12-01-07, 08:34 AM   #24
Sammyboy
The Legitimiser
Thread Starter
 
Sammyboy's Avatar
 
Join Date: Jul 2005
Location: Southampton, UK
Bikes: Gazelle Trim Trophy, EG Bates Track Bike, HR Bates Cantiflex bike, Nigel Dean fixed gear conversion, Raleigh Royal, Falcon Westminster.
Posts: 4,847
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My technique is generally good. Trouble is, when you're 240 lbs, and you've got a large case with around 20lbs of stuff on the rack (when you hit a bump with panniers, everything gives a little; when it's an Office bag 2 on the rack, it just hammers down), and it's night time on terrible streets - well, I post over most things, but at least once per ride, I lead-arse it through something unwittingly. I'm not really hitting anything hard, if I was, then that'd be my first port of call, it's just that what I'm doing is too much for my tyres. If I can find some 27 x 1 3/8, that may be all the difference. That said, Google cannot find a single UK reference for Panaracer Tufflex
Sammyboy is offline   Reply With Quote
Old 12-01-07, 08:50 AM   #25
infinityeye
Nut
 
infinityeye's Avatar
 
Join Date: Apr 2005
Location: Tallahassle, FL
Bikes:
Posts: 697
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
two words.

BMX Brakes.

if in fact BMX is a word...
infinityeye 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 10:50 PM.