YGREG

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,

wrk101

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.


https://sheldonbrown.com/tire-sizing.html

prathmann

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.

Road Fan

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.

rhenning

I run Sun MA14 rimed road wheels on my Hydrid with 700c x 40 tires without problems. Roger

Glennfordx4

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.

cny-bikeman

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.

Glennfordx4

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.

fuzz2050

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.

furballi

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.

Camilo

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.

bjtesch

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.

vsango

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!

corrado33

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?

maddog34

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.........

prathmann

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.

maddog34

i was correcting my error when you quoted me.

try just adding info for the OP's question next time, ok?

prathmann

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.