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


Go Back   > >

Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

User Tag List

Reply
 
Thread Tools Search this Thread
Old 06-09-05, 06:12 AM   #1
justin79
Aluminum.
Thread Starter
 
justin79's Avatar
 
Join Date: Oct 2004
Location: San Francisco, CA
Bikes:
Posts: 218
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
20 vs. 23 mm Tires

Does anyone use 20 mm tires up front and if so, do you notice any significant advantage/disadvantage with this setup? This would be for my track bike on the street, but not in the city.
justin79 is offline   Reply With Quote
Old 06-09-05, 06:35 AM   #2
pitboss
cxmagazine dot com
 
pitboss's Avatar
 
Join Date: Jun 2003
Location: WI
Bikes: Titus road, Fort CX
Posts: 8,269
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I do as the fork on my Tommaso will not accept anything over 21. I see no problem with it. (FWIW, I also run tuffys in that wheelset).
pitboss is offline   Reply With Quote
Old 06-09-05, 07:01 AM   #3
justin79
Aluminum.
Thread Starter
 
justin79's Avatar
 
Join Date: Oct 2004
Location: San Francisco, CA
Bikes:
Posts: 218
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by [165]
I do as the fork on my Tommaso will not accept anything over 21. I see no problem with it. (FWIW, I also run tuffys in that wheelset).
Thanks. I couldn't imagine it would make too much difference, but I thought I'd check.
justin79 is offline   Reply With Quote
Old 06-09-05, 07:14 AM   #4
vobopl
re:member
 
Join Date: Jan 2005
Location: Cracow, Poland
Bikes: unknown make TT bike, fixed; Romet Sport, gone; titanium Pinarello gone;Colnago with Campy C-Record/Super Record,on it's way; Funny Gianni Motta; Buehler track, Polrad track chrome; titanium MTB on 28'', fixed; Tri Wheeler, fixed
Posts: 874
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by justin79
Does anyone use 20 mm tires up front and if so, do you notice any significant advantage/disadvantage with this setup? This would be for my track bike on the street, but not in the city.
I was running 19mm conti pro slicks for years - they were more durable than Michelin 21mms I have now on one of my bikes. Only recently my fixie wears 23mm ones and I think they wouldn't last as long.
Cheers,
v
vobopl is offline   Reply With Quote
Old 06-09-05, 07:49 AM   #5
cicadashell
heliocentrist
 
cicadashell's Avatar
 
Join Date: Aug 2004
Location: ann arbor mi
Bikes:
Posts: 582
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
i've ridden l o n g distances on 20mm tires, front and back, with no ill effects. just keep them way full of air; when they get down to 100 psi they feel spongy (to me, anyway).
cicadashell is offline   Reply With Quote
Old 06-09-05, 08:00 AM   #6
bostontrevor
Retrogrouch in Training
 
bostontrevor's Avatar
 
Join Date: Sep 2004
Location: Knee-deep in the day-to-day
Bikes:
Posts: 5,484
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Yeah, you'll need to keep them pumped higher because the smaller contact patch means that you need more pressure to avoid pinch flats. This will also make for a harsher ride. Also, the smaller tires may actually roll slower because surface features will have a more pronounced effect when you go over them. However if you're riding a lot of country miles on clean smooth pavement, it may be just fine.

"higher" and "harsher" are terms I can't quantify, being a 23c junkie myself.
bostontrevor is offline   Reply With Quote
Old 06-09-05, 08:29 AM   #7
ofofhy
Chronic Tai Shan
 
ofofhy's Avatar
 
Join Date: Oct 2004
Location: PHL/BAL
Bikes: Pake Single Speed
Posts: 1,118
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by justin79
Does anyone use 20 mm tires up front and if so, do you notice any significant advantage/disadvantage with this setup? This would be for my track bike on the street, but not in the city.
Just out of curiosity, what do you run on the rear?
ofofhy is offline   Reply With Quote
Old 06-09-05, 08:57 AM   #8
justin79
Aluminum.
Thread Starter
 
justin79's Avatar
 
Join Date: Oct 2004
Location: San Francisco, CA
Bikes:
Posts: 218
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by ofofhy
Just out of curiosity, what do you run on the rear?
23s, Armadillos.
justin79 is offline   Reply With Quote
Old 06-23-05, 10:53 AM   #9
justin79
Aluminum.
Thread Starter
 
justin79's Avatar
 
Join Date: Oct 2004
Location: San Francisco, CA
Bikes:
Posts: 218
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Sorry to drag this up again. I have the 20 mm tire and it's fine, but someone mentioned I should keep it at a higher pressure than the 23 mm. How much higher? On the side of the tire it says the maximum pressure is 125 psi which is the same as the maximum pressure for most of the 23 mm tires I have had (I think the Armadillos are 130 psi). Typically, I inflate my tires a little bit more than the maximum, but how much more is safe for the 20 mm tire or the 23 for that matter?
justin79 is offline   Reply With Quote
Old 06-23-05, 10:57 AM   #10
bostontrevor
Retrogrouch in Training
 
bostontrevor's Avatar
 
Join Date: Sep 2004
Location: Knee-deep in the day-to-day
Bikes:
Posts: 5,484
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I've heard that tire manufacturers establish the max pressure by going up to blowoff and then halving that number, so you should have plenty of head room. But that's just what I've heard.
bostontrevor is offline   Reply With Quote
Old 06-23-05, 11:16 AM   #11
filtersweep
Senior Member
 
filtersweep's Avatar
 
Join Date: Mar 2004
Bikes:
Posts: 2,615
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by justin79
Does anyone use 20 mm tires up front and if so, do you notice any significant advantage/disadvantage with this setup? This would be for my track bike on the street, but not in the city.

First of all, there is no advantage to running a smaller tire in front, other than the tiny difference in aero profile. I've never used 20s, but had a 19 once for a TT bike, and it cornered like crap. The higher pressure combined with the small contact patch promoted its hopping over surface deformities, rather than maintaining even contact with the pavement- which I consider to be a disadvantage. I like to keep my tires on the pavement. There is some research to suggest they actually have higher rolling resistance.

If, however, they are dirt cheap on sale- because they are 20s, that might be an advantage- but I would not go out of my way to pay full price for them.

If you have a 'dillo in the rear, I can assume you aren't looking for an exquisite ride? BTW- 'dillos definitely appear to be larger than advertised- their 23 is more like a 25.

Last edited by filtersweep; 06-23-05 at 01:31 PM.
filtersweep is offline   Reply With Quote
Old 06-23-05, 11:47 AM   #12
justin79
Aluminum.
Thread Starter
 
justin79's Avatar
 
Join Date: Oct 2004
Location: San Francisco, CA
Bikes:
Posts: 218
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by filtersweep
If, however, they are dirt cheap on sale- because they are 20s, that might be an advantage- but I would go out of my way to pay full price for them.

If you have a 'dillo in the rear, I can assume you aren't looking for an exquisite ride? BTW- 'dillos definitely appear to be larger than advertised- their 23 is more like a 25.
It's a pretty cheap Performance tire; I got it because they didn't have 23s in stock and I didn't figure it would make much difference.

Yes, I prefer not getting flats to an exquisite ride.
justin79 is offline   Reply With Quote
Old 06-23-05, 12:25 PM   #13
Ken Cox
King of the Hipsters
 
Join Date: Jan 2005
Location: Bend, Oregon
Bikes: Realm Cycles Custom
Posts: 2,129
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I ride with an Armadillo in back, and it feels good; not rough at all.
However, I find an Armadillo on the front kinda harsh.
A Continental GP 4 Season in front and an Armadillo in back works for me.
I wonder how rider weight enters into all of this.
Would a lighter rider do better on a thinner tire than would a heavier rider?
I weigh 215 with messenger bag.
Ken Cox is offline   Reply With Quote
Old 06-23-05, 06:08 PM   #14
Mr. Shadow
I need more bikes!!!
 
Mr. Shadow's Avatar
 
Join Date: May 2004
Location: Durham, NC
Bikes: 2 roadies, 7 fixed-gears, 1 hardtail, 1 full suspension mtb, and 1 hybrid...so far.
Posts: 472
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
My Schwinn Le Tour has a Tufo Giro Twix (21) up front
and an Elite (23) on the rear. It works fine for me.
Mr. Shadow 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 04:44 AM.