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


Go Back   > >

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.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 06-05-10, 10:44 AM   #1
YGREG
Newbie
Thread Starter
 
Join Date: Jun 2010
Bikes:
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
What bigger tire sizes could be used instead of original 700x25C on the same rims?

What bigger tire sizes could be used instead of original 700x25C on the same rims? I would like to install 700x35C. Can I do it without getting new rims? Also, what letter C means in the size?

Thank you in advance,

YGREG is offline   Reply With Quote
Old 06-05-10, 12:41 PM   #2
wrk101
Thrifty Bill
 
wrk101's Avatar
 
Join Date: Jan 2008
Location: West of Asheville, NC
Bikes: 86 Katakura Silk, 87 Prologue, 88 Cimarron LE, 1975 Sekai 4000 Professional, 73 Paramount, plus more
Posts: 20,409
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 169 Post(s)
Sheldon Brown site covers tire options at length. You will need to measure your rim. I have found his site to be conservative on what sizing you can use. Of course, fork and stay clearance, along with brake caliper clearance, can all come into play, so even if the rim can handle it, your bike might not.


http://sheldonbrown.com/tire-sizing.html
wrk101 is offline   Reply With Quote
Old 06-05-10, 01:03 PM   #3
prathmann
Senior Member
 
Join Date: Nov 2008
Location: Bay Area, Calif.
Bikes:
Posts: 6,682
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 387 Post(s)
The limiting factor is likely to be with clearances in your frame, fork, and brake calipers rather than just the rim width. I've found that you can go well beyond the recommendations at Sheldon's site without having problems with a tire that's wider than shown for a given rim size. Check how much clearance you have with your current tires at the point where they come closest to touching something and that should give you a good idea of how much wider you can go.

As to the 'C', it should be associated with the 700 rather than with the 25 - so the size should be 700C x 25 (but is frequently mislabeled). At one time there were a series of different wheel sizes that all ended up with the outer diameter of the tire being about 700mm. They had different widths and the rims intended for use with narrowest width tire had the largest diameter and were designated 700A. Rims for wider tires (and therefore slightly smaller rim diameters) were labeled 700B, 700C, 700D. Eventually all but the 700C size rim were dropped and rims with that diameter (actual measurement of 622 mm) are now used for a wide variety of tire widths.
prathmann is offline   Reply With Quote
Old 06-05-10, 03:14 PM   #4
Road Fan
Senior Member
 
Road Fan's Avatar
 
Join Date: Apr 2005
Location: Ann Arbor, MI
Bikes:
Posts: 12,795
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 198 Post(s)
I've run into the brake caliper issue. I wanted to try some diamond tread tubulars as a winter tire, so I installed 32 mm cross tubulars on conventional tubular rims. Even with quick releases the calipers would not open enough to let the inflated 32's be installed. I had to deflate the tires everytime I wanted to pull off or install the wheel. These were medium reach calipers, too.
Road Fan is offline   Reply With Quote
Old 06-05-10, 05:39 PM   #5
rhenning
Senior Member
 
Join Date: Apr 2006
Bikes:
Posts: 2,796
Mentioned: 8 Post(s)
Tagged: 0 Thread(s)
Quoted: 93 Post(s)
I run Sun MA14 rimed road wheels on my Hydrid with 700c x 40 tires without problems. Roger
rhenning is offline   Reply With Quote
Old 06-06-10, 08:14 AM   #6
Glennfordx4 
Holy Spokes it's Batsman!
 
Glennfordx4's Avatar
 
Join Date: Nov 2008
Location: South Jersey
Bikes: Too many Bicycles to list
Posts: 1,739
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
The only real problem I could see is even if the tire fits the rim if the rim is not wide enough the proper tube for the tire would be more likely to get a pinch flat as when you pump it up it would become more of a tear drop shape rather then round or oval.
Glennfordx4 is offline   Reply With Quote
Old 06-06-10, 08:40 AM   #7
cny-bikeman
Mechanic/Tourist
 
Join Date: Apr 2007
Location: Syracuse, NY
Bikes: 2008 Novara Randonee - love it. Would have more bikes if I had time to ride them all. Previous bikes: 1968 Motobecane Mirage, 1972 Moto Grand Jubilee (my fav), Jackson Rake 16, 1983 C'dale ST500.
Posts: 6,875
Mentioned: 5 Post(s)
Tagged: 0 Thread(s)
Quoted: 244 Post(s)
Quote:
Originally Posted by Glennfordx4 View Post
The only real problem I could see is even if the tire fits the rim if the rim is not wide enough the proper tube for the tire would be more likely to get a pinch flat as when you pump it up it would become more of a tear drop shape rather then round or oval.
No, actually if the rim is too narrow the tire will not be as stable on turns, as it will be squeezed to a different, much higher profile than designed.
cny-bikeman is offline   Reply With Quote
Old 06-06-10, 08:52 AM   #8
Glennfordx4 
Holy Spokes it's Batsman!
 
Glennfordx4's Avatar
 
Join Date: Nov 2008
Location: South Jersey
Bikes: Too many Bicycles to list
Posts: 1,739
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Quote:
Originally Posted by cny-bikeman View Post
No, actually if the rim is too narrow the tire will not be as stable on turns, as it will be squeezed to a different, much higher profile than designed.
Agreed,which is kinda the same thing I meant, if the tube is tear drop shaped more pressure will be exerted to the top side of the tire then in between the rim section at the bead causing the tire to want to peel in a high speed corner.It's all good info.I should have posted exactly what I was thinking but I was on my first cup of coffee.
Glennfordx4 is offline   Reply With Quote
Old 06-06-10, 11:18 AM   #9
fuzz2050
Real Men Ride Ordinaries
 
fuzz2050's Avatar
 
Join Date: Sep 2008
Bikes:
Posts: 3,722
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 15 Post(s)
Quote:
Originally Posted by cny-bikeman View Post
No, actually if the rim is too narrow the tire will not be as stable on turns, as it will be squeezed to a different, much higher profile than designed.
I remember this from when I mounted a 37mm tire on the 14mm rim of my touring bike. It was a pain to get to work, the tube just wouldn't behave. Handling was just bizarre, the bike felt like it would wash out from under me at the slightest provocation. Needless to say, that is at the extreme end of the spectrum, and that the bike feels just fine with 32mm tires on the same rims.
fuzz2050 is offline   Reply With Quote
Old 06-06-10, 01:42 PM   #10
furballi
Senior Member
 
Join Date: Mar 2010
Bikes:
Posts: 919
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
25 to 35 is no problem, as long as the tire will clear the frame and brake. There is no need to increase the working pressure north of 90 psi when dealing with 35mm tire.
furballi is offline   Reply With Quote
Old 06-06-10, 01:55 PM   #11
Camilo
Senior Member
 
Join Date: Apr 2007
Bikes:
Posts: 4,501
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 214 Post(s)
Just as a point of reference with a fairly common rim -I have 32 mm tires on my Mavic Aksium rims. I'm not sure of the width of these rims, but I've run 23's on them. They're not the narrowest ones I have, but they're pretty typical for road rims.

The 32's installed easily, work perfectly, and actually look perfectly normal too. I'm sure I could run a 35 no problem, but dont' care for a tire quite that big.

I can run the 32's at about 60 lbs (I weigh about 165lb). Very rough road and rough pavement and no pinch flats. I might even try 50, but 60 lbs. is comfortable and fast. By the way, I use (IIRC) 19-26mm tubes in there. I tend to like smaller tubes. These, again, work just fine.

Oh, what someone else mentioned - most likely the limiting factor won't be your rims, but the frame and/or brake clearance. The bike I put the 32's on has V brakes (with road levers and Travelagent adapters), so that isn't an issue for me. There's no way I can get anything larger than a 28 (more likely a 25) on my other road bike, regardless of the rims.

Last edited by Camilo; 06-06-10 at 02:07 PM.
Camilo is offline   Reply With Quote
Old 06-06-10, 05:53 PM   #12
bjtesch
Senior Member
 
Join Date: Aug 2008
Location: Irving, TX
Bikes: Schwinn Paramount
Posts: 358
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I've been running 25mm tires for the past 20 years. I've used different brands, some marked 25mm, some 23mm and some 20mm, but they all actually measured 25mm. Over that 20 year period my weight has gone from 170 pounds to 220 pounds. I'm going to try 28mm tires next. I can't see any reason yet to go to anything larger than that.
bjtesch is offline   Reply With Quote
Old 06-27-17, 03:35 PM   #13
vsango
Newbie
 
Join Date: Jun 2017
Bikes:
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Rims/tire size; How to extend the fork post

Hi. I need to have a straight position on my road FELT ZW95 2013 due to injuries on my upper back and neck. It's impossible to have a long ride without having bad pain and numbness of my right hand; also a burning sensation on my upper muscles(back, shoulders). The sensation of electricity flowing from my shoulder to the elbow and fingers is horrible. I need to know what is the maximum extension I can do and which parts I need to do it. I had invest a lot of money on my bike on customization and I love it! I don't want to change it (last alternative to contemplate). Also if I can use a 28mm instead of a 23mm tire on the Mavic Axium rims. Thank you in advance for your help guys!
vsango is offline   Reply With Quote
Old 06-27-17, 03:53 PM   #14
corrado33
Senior Member
 
Join Date: Jun 2013
Location: Bozeman
Bikes: 199? Landshark Roadshark, 198? Mondonico Diamond, 1987 Panasonic DX-5000, 1987 Bianchi Limited, Univega... Chrome..., 1989 Schwinn Woodlands, Motobecane USA Record, Raleigh Tokul 2
Posts: 4,135
Mentioned: 24 Post(s)
Tagged: 0 Thread(s)
Quoted: 1112 Post(s)
Quote:
Originally Posted by vsango View Post
Hi. I need to have a straight position on my road FELT ZW95 2013 due to injuries on my upper back and neck. It's impossible to have a long ride without having bad pain and numbness of my right hand; also a burning sensation on my upper muscles(back, shoulders). The sensation of electricity flowing from my shoulder to the elbow and fingers is horrible. I need to know what is the maximum extension I can do and which parts I need to do it. I had invest a lot of money on my bike on customization and I love it! I don't want to change it (last alternative to contemplate). Also if I can use a 28mm instead of a 23mm tire on the Mavic Axium rims. Thank you in advance for your help guys!
According to the mavic website the axsium rim has a 17mm internal width.

In theory, a 28 would fit on those rims just fine BUT!!! we have no idea if 28s will fit in your FRAME. It doesn't matter if the 28 will fit on your rim if it rubs in your frame.

How much space is between the tire and brake bridge now? How about between the tire and chainstays? Between the tire and fork?
corrado33 is offline   Reply With Quote
Old 06-27-17, 05:11 PM   #15
maddog34
Senior Member
 
maddog34's Avatar
 
Join Date: Jul 2015
Location: NW Oregon
Bikes: !981 Trek 930R Custom, Diamondback ascent with SERIOUS updates, and a trek 6700 with updates
Posts: 1,225
Mentioned: 9 Post(s)
Tagged: 1 Thread(s)
Quoted: 475 Post(s)
post your bike's brand name and model... this will help end the endless speculation as to what max tire size will be...

chances are, if the bike was originally equipped with the 25mm tires, then the max tire size will be 28mm, or MAYBE 32mm... before your tires end up rubbing the chain stays and fork while cornering...

and yes, RIM WIDTH will play into the equation too... brake reach will be fit to the frame/fork, with it's intended wheels...not the tires... tire size is more limited by the frame/fork.

700c stands for the outer DIAMETER of an "average" tire, mounted and inflated, btw... and the "700" dimension is in Millimeters!.... kinda like the "26 inch" MTB wheels... the rims actually measure about 22 3/4" in diameter.... i know... weird, and confusing... it is what it is.... and "29er" RIMS are the SAME diameter as a 700c rim... and then, there's SCHWINN specific rims, with their own special diameters, and oddball bead profiles... their specific tires are marked with FRACTIONAL inch sizes for the tire widths, btw...hoo boy, huh?......... etc.........

Last edited by maddog34; 06-27-17 at 05:51 PM.
maddog34 is offline   Reply With Quote
Old 06-27-17, 05:32 PM   #16
prathmann
Senior Member
 
Join Date: Nov 2008
Location: Bay Area, Calif.
Bikes:
Posts: 6,682
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 387 Post(s)
Quote:
Originally Posted by maddog34 View Post
700c stands for the DIAMETER of an average tire, mounted and inflated, btw... the dimension is in "C"entimeters.... kinda like the "26 inch" MTB wheels... the rims actually measure about 22 3/4" in diameter.... i know... weird, and confusing... it is what it is....
No, it is certainly not referring to 700 centimeters - that would be almost 23 feet. 700c rims actually have a diameter measured at the bead of 622 millimeters, but the 700 referred to the approximate total diameter at the edge of the tire being about 700 millimeters. As I stated before, there used to be several different widths of rims designated as 700a, 700b, 700c, and 700d all of which had about the same diameter of tire when used with tires of appropriate width for the respective rim (narrowest for 700a, widest for 700d). Presumably the 700c rims were designed for tires with a width of about 39mm so the diameter of the tire edge would come out as 622mm + 2 x 39mm = 700mm.
prathmann is offline   Reply With Quote
Old 06-27-17, 07:55 PM   #17
maddog34
Senior Member
 
maddog34's Avatar
 
Join Date: Jul 2015
Location: NW Oregon
Bikes: !981 Trek 930R Custom, Diamondback ascent with SERIOUS updates, and a trek 6700 with updates
Posts: 1,225
Mentioned: 9 Post(s)
Tagged: 1 Thread(s)
Quoted: 475 Post(s)
Quote:
Originally Posted by prathmann View Post
No, it is certainly not referring to 700 centimeters - that would be almost 23 feet. 700c rims actually have a diameter measured at the bead of 622 millimeters, but the 700 referred to the approximate total diameter at the edge of the tire being about 700 millimeters. As I stated before, there used to be several different widths of rims designated as 700a, 700b, 700c, and 700d all of which had about the same diameter of tire when used with tires of appropriate width for the respective rim (narrowest for 700a, widest for 700d). Presumably the 700c rims were designed for tires with a width of about 39mm so the diameter of the tire edge would come out as 622mm + 2 x 39mm = 700mm.
i was correcting my error when you quoted me.

try just adding info for the OP's question next time, ok?
maddog34 is offline   Reply With Quote
Old 06-27-17, 08:34 PM   #18
prathmann
Senior Member
 
Join Date: Nov 2008
Location: Bay Area, Calif.
Bikes:
Posts: 6,682
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 387 Post(s)
Quote:
Originally Posted by maddog34 View Post
i was correcting my error when you quoted me.

try just adding info for the OP's question next time, ok?
I had already answered the OP's questions in post #3 - both the one on what widths he could use and the one asking what the "c" in 700c comes from. So it was a bit surprising to see the misconception that the "c" stands for centimeters show up in your post. Sorry that I'm not clairvoyant enough to know what posts will be corrected before they actually are.
prathmann 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 12:27 AM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    get answers from real people!
Click to start entering your question.
I HAVE A QUESTION