Tire sizes

Old 01-12-12, 10:27 PM
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Join Date: Dec 2006
Location: usa
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Tire sizes

I have a Schwinn 26 inch mountain bike from big box mart LOL the rear tire the tread is wearing out from braking. The current tire size is 26x2.0 Do i have to use this size or whats the biggest width I can go with? Also do they sell 26 inch wheels with the 7 gear cassette thingy already attached? I have worn out 6th and 7th gear in the rear and its not a year old.
Old 01-18-12, 06:38 PM
Join Date: Oct 2008
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Hi Flirty, sorry to be late.
The rear tire size has to match the rim and there is generally some flexibility, but most of the time they already have the widest tire on there. See if there is any size stamped into the rim, between the spokes. The sprockets come in many varieties, but in most cases you would need to replace the entire group of 7 sprockets. Again, there will be a name on the sprocket, but it would take a bike shop to spin off just the outer two even if they were replaceable.

If the cluster is in trouble in 6th and 7th, then you are using the high gears too much and need to kick it down and increase your pedal rate. I know, I can't do that either, but that is what wears out the high gears. The bad news is that it also wears out the chain. Measure 12 inches of chain and each link should fall on a 1/2" mark. If at the 12" mark the chain is 1/16 of an inch longer than it should be, it needs to be replaced. At 1/8th inch of stretch it will not function long on a new sprocket and will quickly wear it out. Chains and sprockets are usually replaced in pairs.

If you stop into a bike shop with the rear wheel to ask about the sprocket and tire they can quote you a price for removing the sprocket if needed.

Old 11-14-12, 04:20 PM
Join Date: Jan 2012
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Although not a big fan of bumping old threads, I thought I would expand on this one a bit as we (in Canada and Northern US states) are getting into winter, which is bike maintenance time for us harder riders.

What type of surface are you riding most of the time? I'm assuming pavement or hard packed dirt?
I would suggest sticking with something around a 2.0 (odd size) or a 2.1" wide tire unless you are into dirt jumping, trials or all mounting biking. For casual riding, 2.0" is a good size.
If you are riding mostly hardpack or pavement, I would also suggest looking at a semi-slick tire or something with a center line in it. These will offer lower rolling resistance, generally last a bit more miles, and still offer good cornering if you find yourself in loose dirt.

Regarding your rear cassette (the cluster of sprokets on the back rim), you'll need to replace them as a group as most or all of them come attached to each other. If you replace your cassette, replace your chain. What Bud stated is pretty much on the money, but I wouldn't chance an old chain on a new cassette.

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