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Ignorant tire sizing question.(7 posts)

Ignorant tire sizing question.UncleMoe
Nov 19, 2003 1:33 PM
How do I know if a tire will fit on my rim?

I bought a tandem with 700x28 size tires. I want to put on 700x32 or possibly 700c35. How do I know if they will fit?

I noticed on most tires it says something like 700x28 (28x622). I am guessing the second set of numbers have to do with rim compatibility.
Good questionMel Erickson
Nov 19, 2003 1:44 PM
Most 700c tires will fit on most 700c rims. It's kinda like cross chaining, you don't use big-big or little-little except for tires you shouldn't/can't use narrow rims and big tires or wide rims and narrow tires. In your case either 700x32 or 700x35 tires will fit on rims that accept 700x28 tires. However, you don't just have the rim to worry about. You need to consider frame/fork clearance. On a tandem I wouldn't think that would be a huge issue for 32 or 35 tires but you don't always know until you try them.
Thanks MelUncleMoe
Nov 19, 2003 2:08 PM
Good point on the clearance. The brake clearance will be fine, they are V brakes so I can diconnect them and get the wheel off fine, but I didn't look at the fork or rear tire clearance on the frame. I think it will be fine but will double check before I order the tires.

Good to know the 32's or 35's won't blow off the rim because I didn't understand they would or wouldn't fit. My wife would sort of hate me.
When in doubt, Sheldon Brown dot comDave Hickey
Nov 19, 2003 7:34 PM
As Mel said, it shouldn't be a problem. If you want to know what will fit:

http://www.sheldonbrown.com/tire_sizing.html

Scroll down the bottom. Look at the chart comparing rim width vs tire size
Depends on the rim.MR_GRUMPY
Nov 20, 2003 6:58 AM
A standard Mavic Open Pro will take a 700x18 thru 700x28 without many problems but a wide touring rim will take a 700x25 thru 700x35.
It's the same as car tires. You don't put a wide low profile tire on a skinny rim because they CAN come off.
Unless you have clearance problems.....Alexx
Nov 20, 2003 12:22 PM
....you should be able to fit most any reasonable size tires. I have a SS/Fixie built on a touring frame that waqs designed primarily for 28 wide tires, but I'm running 38's right now without problems. Yeah, they just barely clear the chainstays, but at least I know when the rear wheel slips out...
THANKS ALLUncleMoe
Nov 20, 2003 3:47 PM
Sheldon Brown's site helped out a lot. The rim I have is 19mm wide. According to the chart, I shouldn't be running 25's, which I am on the front because I couldn't readily find anything higher. I'll need to use mail order.

The good news is I can go from a 28 to a 44. I might do 35's to make both my wife and I feel more stable. The tandem is quite a challenge with the skinnier tires. I was going to go to 32's, but might as well go higher and worked down to 32's.