Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

700x18-25 tube or 700x25-32 tube

Notices
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.

700x18-25 tube or 700x25-32 tube

Old 10-19-21, 10:09 AM
  #1  
hrdknox1
Senior Member
Thread Starter
 
hrdknox1's Avatar
 
Join Date: Apr 2014
Posts: 180
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 82 Post(s)
Liked 50 Times in 38 Posts
700x18-25 tube or 700x25-32 tube

I mistakenly purchased 700x25-32 inner tubes. I've always used 700x18-25 inner tubes. My tire is 700x25. Am I better off using the smaller, or larger inner tube?
hrdknox1 is offline  
Old 10-19-21, 10:10 AM
  #2  
cxwrench
Senior Member
 
cxwrench's Avatar
 
Join Date: Jul 2013
Location: Nor-Cal
Posts: 3,052

Bikes: lots

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 1509 Post(s)
Liked 2,159 Times in 1,126 Posts
The smaller tube will be much easier to install.
cxwrench is online now  
Old 10-19-21, 10:26 AM
  #3  
hrdknox1
Senior Member
Thread Starter
 
hrdknox1's Avatar
 
Join Date: Apr 2014
Posts: 180
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 82 Post(s)
Liked 50 Times in 38 Posts
Originally Posted by cxwrench View Post
The smaller tube will be much easier to install.
Good point....and mounting the tires on one set of rims I have is tight to begin with.
hrdknox1 is offline  
Old 10-19-21, 10:55 AM
  #4  
Iride01
MotuekaCascadeChinook
 
Iride01's Avatar
 
Join Date: Jul 2017
Location: Mississippi
Posts: 10,636

Bikes: '20 Tarmac Disc Comp '78 Raleigh Competition GS

Mentioned: 40 Post(s)
Tagged: 0 Thread(s)
Quoted: 4296 Post(s)
Liked 2,850 Times in 1,985 Posts
If the 700 x 25 - 32 fits without wrinkling in the tire then it might be less prone to flatting. Or if it does get punctured it'll have more of a chance to being a slow leak instead of a balloon being popped.

It might be somewhat more difficult to install on a narrow rim without inadvertently damaging it with a lever or pinching as you roll the tire bead over the rim, but I now tend to favor using the larger width range that is for my tire size.

And no, just because in the first paragraph I likened the small range to a balloon being popped, does that mean that I feel it does that often and every time.
Iride01 is offline  
Old 10-19-21, 01:12 PM
  #5  
zacster
Senior Member
 
Join Date: Jul 2004
Location: Brooklyn NY
Posts: 7,389

Bikes: Kuota Kredo/Chorus, Trek 7000 commuter, Trek 8000 MTB and a few others

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
Liked 320 Times in 250 Posts
I started using 25-32 tubes on my 700x28 tire but it would also fit easily in a 25. If that's what you have, use it. I bought 5 of them at once because that was the only way to get them a year ago when everything bike related was in short supply and I figure that I seem to go through tubes on a regular basis. Since I bought them though I've only had one issue and that was when I broke the presta core.
zacster is offline  
Old 10-19-21, 01:39 PM
  #6  
ThermionicScott 
working on my sandal tan
 
ThermionicScott's Avatar
 
Join Date: Aug 2011
Location: CID
Posts: 21,905

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

Mentioned: 95 Post(s)
Tagged: 0 Thread(s)
Quoted: 3554 Post(s)
Liked 1,947 Times in 1,243 Posts
The tube is designed to work in a 700x25C tire, so the rest is up to you.

As always, putting a little bit of air in the tube before installing will help keep it from getting caught under the tire bead. Just enough so it starts to take a circular shape, but not so much that it starts to puff up. If you're unafraid of germs, what you can put in with your mouth will do it.
__________________
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  
Likes For ThermionicScott:
Old 10-19-21, 02:42 PM
  #7  
3alarmer 
Friendship is Magic
 
3alarmer's Avatar
 
Join Date: Nov 2010
Location: The Big Tomato
Posts: 20,552

Bikes: old ones

Mentioned: 292 Post(s)
Tagged: 0 Thread(s)
Quoted: 23324 Post(s)
Liked 6,750 Times in 4,834 Posts
Originally Posted by hrdknox1 View Post
I mistakenly purchased 700x25-32 inner tubes. I've always used 700x18-25 inner tubes. My tire is 700x25. Am I better off using the smaller, or larger inner tube?
...I think the website where I buy Conti tubes in bulk numbers recently started recommending the larger 25x32 tubes in 25's as under less elastic stretch, thus less prone to flatting than an 18x25. I'm uncertain what they are basing this on, other than some thought process. The fatter tubes are a tiny bit heavier, so add a small bit to the rotating weight. I pretty much use them interchangeably, and try not to worry too much about it. I have plenty of other stuff to worry about.
3alarmer is offline  
Old 10-19-21, 02:47 PM
  #8  
Bonzo Banana
Senior Member
 
Join Date: Feb 2017
Location: Merry Old England
Posts: 764

Bikes: Muddyfox Evolve 200, Bicycles4u Paris Explorer, Raleigh Twenty Stowaway, Bickerton California, Saracen Xile, Kona Hoss Deluxe, Vertigo Carnaby, Exodus Havoc, Kona Lanai, Revolution Cuillin Sport, Dawes Kingpin, Bickerton, NSU & Elswick Cosmopolitan

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 288 Post(s)
Liked 28 Times in 22 Posts
Personally I would go with the larger inner tube because it should be thicker when used with the smaller tyre and therefore slightly more resistant to punctures. However it doesn't end there I pretty much buy my inner tubes when I see them cheap so price would dictate what I would buy to a greater degree. However if they were the same price for either size I would go with the larger inner tube.

What I always find confusing is inner tubes that give one size and little other information. I.e. 26x2.125". Is that up to 2.125" or nominal at 2.125" and capable of a bit either way or maybe its the minimum size tyre. When I actually look at the inner tube it felt like 2.125" was the absolute maximum but I'm sure I've had other inner tubes where that didn't apply. Then you get inner tubes which have a greater tyre range than other similar inner tubes. Why can this inner tube do 1.75-2.5" when other similar inner tubes can only do 1.95-2.125". Is that an indication that the rubber is thinner so can stretch more? Just making the point there are quite a few variables in play.

Bonzo Banana is offline  
Old 10-19-21, 03:02 PM
  #9  
ThermionicScott 
working on my sandal tan
 
ThermionicScott's Avatar
 
Join Date: Aug 2011
Location: CID
Posts: 21,905

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

Mentioned: 95 Post(s)
Tagged: 0 Thread(s)
Quoted: 3554 Post(s)
Liked 1,947 Times in 1,243 Posts
Since tubes don't know what tire they're going into and will expand in all directions until failure, I'd imagine the labelling just indicates what the manufacturer is comfortable with. Someone in the legal or warranty department doesn't want the hassle of people sticking a 700x18C tube into a 3" 29er tire and having failures, so they draw the line somewhere.

My preference is for tubes that are manufactured to have thin walls, but then to use a size that doesn't require them to stretch much. That way, I get the benefits of lighter tubes, but without the concern that an extra-thin spot has developed anywhere.
__________________
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 10-19-21, 06:58 PM
  #10  
70sSanO
Senior Member
 
70sSanO's Avatar
 
Join Date: Feb 2015
Location: Mission Viejo
Posts: 4,862

Bikes: 1986 Cannondale SR400 (Flat bar commuter), 1988 Cannondale Criterium XTR, 1992 Serotta T-Max, 1995 Trek 970

Mentioned: 17 Post(s)
Tagged: 0 Thread(s)
Quoted: 1575 Post(s)
Liked 1,569 Times in 989 Posts
I’ve started going to 25-32 tubes in 700x25 tires. It is tougher to fit in the tire, but I did it for less expansion/thinning of the tube wall. I also have 700x28 tires so it is easier to buy and stock one size tube.

John
70sSanO is offline  
Likes For 70sSanO:

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 - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.