Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

new tire, new tube?

Old 01-22-12, 01:37 PM
  #1  
mozad655
Senior Member
Thread Starter
 
Join Date: Sep 2011
Posts: 290
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
new tire, new tube?

Im planning on relpacing my current 700 x 35C cyclocross tires with far narrower racing tires. Does that mean that I'll have to buy a new tube aswell? And perhaps a new rim even?

Last edited by mozad655; 01-22-12 at 01:44 PM.
mozad655 is offline  
Old 01-22-12, 01:43 PM
  #2  
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 36,049

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 121 Post(s)
Tagged: 1 Thread(s)
Quoted: 4342 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Yes, especially if your old tube is sized near the top of the range, ie. 32-38.

It's really a question of how far is far. Going to 28c you could probably reuse the tube. Going to 25 or less you won't be able to stuff a large tube in there.

If you're on the fence, the way to decide is to inflate the tube outside the tire until it takes shape but doesn't stretch. The unstretched width has to be less than the width of the tire you're going to stuff it into.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.

Last edited by FBinNY; 01-22-12 at 01:48 PM.
FBinNY is offline  
Old 01-22-12, 01:52 PM
  #3  
prathmann
Senior Member
 
Join Date: Nov 2008
Location: Bay Area, Calif.
Posts: 7,261
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 657 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Probably not since tubes handle a wide range of widths. But if your current tube is much wider than needed with the new tire then you might find it more difficult than usual to mount the tire/tube without getting parts of the wide tube pinched under the tire bead. Just takes a little more care, but you can always use an extra spare tube anyway - so you might as well get a new one of the right width. The current rim will probably work ok, but depends on how wide it is. There's a recommendation on Sheldon's site on which rim widths go with which tire widths, but in practice you can usually go well outside of the recommended range without any problems.
prathmann is offline  
Old 01-22-12, 02:23 PM
  #4  
mozad655
Senior Member
Thread Starter
 
Join Date: Sep 2011
Posts: 290
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Sounds good. If i'm interested in much "puncture resistance", will the tube play a role?
mozad655 is offline  
Old 01-22-12, 02:30 PM
  #5  
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 36,049

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 121 Post(s)
Tagged: 1 Thread(s)
Quoted: 4342 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by mozad655 View Post
Sounds good. If i'm interested in much "puncture resistance", will the tube play a role?
Slightly, without going to thornproof or similar, a tube nearer the final width will stretch less, and so have slightly thicker rubber when inflated. Also I've found tubes to hold patches better if not overly stretched in use, so I tend to buy tubes near the larger end of the acceptable width. Yes, they're a few grams heavier, but I make up for that by trimming my fingernails.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Old 01-22-12, 03:09 PM
  #6  
Bill Kapaun
Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 10,803

Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 661 Post(s)
Liked 26 Times in 22 Posts
Ditto what FBinNY said.
IF you get something like a small thorn coming in at an angle, that few thousandths extra thickness MIGHT make a difference.
If nothing else, it MIGHT make a slow leak a bit slower allowing you to get home.

Look for puncture resistant tires if that is important to you.

As to size-
I replaced my 35MM tires with 26MM.
My rims are 22MM wide, and the 26's look good.
I definitely wouldn't go lower than 25mm though!!!
Bill Kapaun is offline  
Old 01-22-12, 03:28 PM
  #7  
mozad655
Senior Member
Thread Starter
 
Join Date: Sep 2011
Posts: 290
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I just took out the tube and pumped it, but deciding when it is filling its shape and when it is strecthing is rather tough. Any tips?
mozad655 is offline  
Old 01-22-12, 03:30 PM
  #8  
mozad655
Senior Member
Thread Starter
 
Join Date: Sep 2011
Posts: 290
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by Bill Kapaun View Post
My rims are 22MM wide
thats the inner measurement right?
mozad655 is offline  
Old 01-22-12, 03:34 PM
  #9  
Bill Kapaun
Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 10,803

Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 661 Post(s)
Liked 26 Times in 22 Posts
Inside bead seat to bead seat.
These are wider than typical 700C road bike rims. More like you'd find on a fat tired Hybrid/29'r
Bill Kapaun is offline  
Old 01-22-12, 03:38 PM
  #10  
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Posts: 36,049

Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter

Mentioned: 121 Post(s)
Tagged: 1 Thread(s)
Quoted: 4342 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by mozad655 View Post
I just took out the tube and pumped it, but deciding when it is filling its shape and when it is strecthing is rather tough. Any tips?
Uninflated the tube is flat and limp. Fill it only until it's round. That's the unstretched condition. Or you could lay the tube flat, measure across, multiply by 1-1/2 to find inflated diameter (2x flat width is the circumference, divided by 3 (approx. but good enough) is the diameter).
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is offline  
Old 01-22-12, 03:51 PM
  #11  
ThermionicScott 
hungry
 
ThermionicScott's Avatar
 
Join Date: Aug 2011
Location: CID
Posts: 18,507

Bikes: 1991 Bianchi Eros, 1964 Armstrong, 1988 Diamondback Ascent, 1988 Bianchi Premio, 1987 Bianchi Sport SX, 1980s Raleigh mixte (hers)

Mentioned: 68 Post(s)
Tagged: 0 Thread(s)
Quoted: 2025 Post(s)
Liked 95 Times in 79 Posts
What size of tire are you switching to? Tubes are cheap, just get a couple smaller ones, save your big tubes as spares, call it a day.
__________________
Originally Posted by chandltp View Post
There's no such thing as too far.. just lack of time
Originally Posted by noglider
People in this forum are not typical.
RUSA #7498
ThermionicScott is offline  
Old 01-22-12, 04:01 PM
  #12  
mozad655
Senior Member
Thread Starter
 
Join Date: Sep 2011
Posts: 290
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
okay that makes sence. I also measured the rim width and I got 13mm. Would a <25 witdth tire be a good choice?
mozad655 is offline  
Old 01-22-12, 04:07 PM
  #13  
prathmann
Senior Member
 
Join Date: Nov 2008
Location: Bay Area, Calif.
Posts: 7,261
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 657 Post(s)
Likes: 0
Liked 1 Time in 1 Post
Originally Posted by mozad655 View Post
okay that makes sence. I also measured the rim width and I got 13mm. Would a <25 witdth tire be a good choice?
That's a pretty narrow rim, so you can use as narrow a tire as you want. Personally I don't find there to be much of an advantage in going below 25mm, but the rim would work fine with 23mm (or even 18mm) tires.
prathmann is offline  
Old 01-22-12, 04:11 PM
  #14  
Bill Kapaun
Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 10,803

Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 661 Post(s)
Liked 26 Times in 22 Posts
What bike is this on?
13MM seems WAY too narrow for a bike with 35C tires.
Bill Kapaun is offline  
Old 01-22-12, 04:27 PM
  #15  
mozad655
Senior Member
Thread Starter
 
Join Date: Sep 2011
Posts: 290
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
I believe the bike is called Focus Mares Ax3 http://www.heino-cykler.dk/Cykler/Cr...rosscykel.html

The 13mm would be the "inner rim width" on the picture found here http://sheldonbrown.com/tire-sizing.html. It suprised me aswell.

Last edited by mozad655; 01-22-12 at 04:31 PM.
mozad655 is offline  
Old 01-22-12, 05:16 PM
  #16  
dbruening80
Senior Member
 
Join Date: Aug 2011
Location: St. Peters MO
Posts: 62

Bikes: '11 Bianchi Infinito 1986 Trek 400 Elance

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Likes: 0
Liked 0 Times in 0 Posts
Originally Posted by ThermionicScott View Post
What size of tire are you switching to? Tubes are cheap, just get a couple smaller ones, save your big tubes as spares, call it a day.
+1
dbruening80 is offline  
Old 01-22-12, 05:57 PM
  #17  
Bill Kapaun
Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Posts: 10,803

Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.

Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 661 Post(s)
Liked 26 Times in 22 Posts
Well, you can put on the thinnest tire you can find, if you want.
Match tube size to the tire and you are good!
Bill Kapaun is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
spectastic
Bicycle Mechanics
4
07-05-19 06:39 PM
asmac
Advocacy & Safety
58
01-30-15 10:30 AM
PDXaero
Classic & Vintage
12
08-18-13 05:07 PM
superduper54
Singlespeed & Fixed Gear
8
07-03-09 01:48 PM
alwaysbefirst
Road Cycling
1
07-25-05 03:26 PM

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


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.