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Old 02-18-06, 01:16 PM   #1
Autobus
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Can you put a 700x28 on a rim that uses 700x23/25?

I'm a commuter and I currently have 700x25c and was thinking of going to a 700x28c if my rims can handle it. Would the 28 fit?
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Old 02-18-06, 01:51 PM   #2
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What bike do you have? It's more a question
of it clearing the brakes and frame than anything else.

Here's my tire...
http://www.rivbike.com/webalog/tires_tubes/10043.html

Last edited by late; 02-18-06 at 02:15 PM.
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Old 02-18-06, 01:52 PM   #3
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It'll fit your rim.

Other things to consider is if it will fit between your chainstays (how much clearance do your 25's have?) and if your brakes will open wide enough for easy tire removal.
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Old 02-18-06, 02:23 PM   #4
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Quote:
Originally Posted by Autobus
I'm a commuter and I currently have 700x25c and was thinking of going to a 700x28c if my rims can handle it. Would the 28 fit?
I have two bikes with Mavic Open Pro rims using x28 tires. As already pointed out, brake and frame clearances are in play. With Shimano Ultegra or 105 dual pivot brakes, the x28 width just barely clears new brake pads with the brake QR released - but the tires I use (Conti UltraGatorskins) do, in fact, clear. On one of my frames the x28 tire clears the seat stay bridge by only 4mm.

All that being said, I love x28 tires. I run them at 90psi (I weigh 190 lbs) and only rarely get a flat. My next bike will be built to take x32's or bigger. If you're not racing, those skinny tires just make you uncomfortable.
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Old 02-18-06, 04:35 PM   #5
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If you're building up a new bike, it's worth using wider rims that are more ideal for wider tires (not to mention a frame designed for long-reach or cantilever brakes). But 28's will run just fine on narrow road rims. Your main issue, as others have mentioned, will be clearance under the brake calipers.
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Old 02-18-06, 04:43 PM   #6
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There is a tire/rim sizing chart here:

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

Thank You Sheldon Brown!
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Old 02-18-06, 08:36 PM   #7
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As lond as the tires clear the frame, brakes, and the front derailluer. My 2.8 Cannondale frame is tight enough that a 25mm tire rubs the front derailluer.
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Old 02-18-06, 08:38 PM   #8
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^^ I hope that's just rubbing the clamp, DD, because you've got issues if it's hitting any other part of the derailleur.
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Old 02-19-06, 05:15 AM   #9
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Note that 28mm tyres are particularly variable in size. Some are like a typical 25mm, others more like a 32mm touring tyre.
Threre is no problem fitting them to a racing rim as long as your bike has clearance.
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Old 02-19-06, 04:50 PM   #10
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Quote:
Originally Posted by beppe
^^ I hope that's just rubbing the clamp, DD, because you've got issues if it's hitting any other part of the derailleur.
The sping loaded pivot on an RSX rear derailluer.
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