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newbie with a question?

Old 08-20-07, 04:03 PM
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Killer Cougar
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newbie with a question?

I know this question has probably been asked a million times but I am not quite sure where to look for it. So, what is the smallest tire I can put on my mountain bike? It is an old Roadmaster from Wal-Mart that I am trying to make into a commuter bike that I wouldn't mind being stolen while at work in the city. It currenlty has a 26x1.95 in the rear and a 26x1.75 in the front. I was looking at maybe a 26x1.5 or a 26x1.25, but not sure if they would fit.
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Old 08-20-07, 04:31 PM
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Jay.Money
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I just replaced my 2" tires with 1.5" tires. The 1.5" came recommended by a few folks over in the Commuter thread and they work well. I was tempted to go smaller (1.25") but heard that it wouldn't drastically improve the bikes performance and would make riding on rough roads tougher (we've got streetcar tracks, potholes, etc).
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Old 08-20-07, 04:47 PM
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Doug5150
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Originally Posted by Killer Cougar View Post
I know this question has probably been asked a million times but I am not quite sure where to look for it. So, what is the smallest tire I can put on my mountain bike? .... I was looking at maybe a 26x1.5 or a 26x1.25, but not sure if they would fit.
This depends on the width of the rim you have. Too narrow a tire on a wide rim will tend to result in you getting sidewall damage.

A fair rule of thumb is the tire shouldn't be less than 3/4ths the width of the rim, or wider than 3/2 of the rim (but that's another problem...).

That said--most MTB bikes now come with rims that are around one inch wide (outside width), so you can put tires all the way down to one inch wide (Continental Gran Prix) on them. Either of the two widths you mentioned will likely work just fine.

Also note--when you get narrower tires, you need to get narrower tubes as well. Running a fat/skinny ture with a skinny/fat tube will lead to constant flat tires.
~
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Old 08-20-07, 04:55 PM
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Bill Kapaun
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A lot depends on your weight and road conditions.
IF you have smooooooth pavement, you can go a little "skinnier". Smaller tires require higher pressure and you have to stay on top of that.
I ride an old RockHopper on smooth pavement (with occasional high driveway "lips"), but weigh 240+. I've found the 1.5" works good for me. I can get the pressure high enough with my old pump to not have "problems", but top them off at the gas station to 65-70 PSI.
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Old 08-21-07, 10:26 AM
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Thanks guys! Thats exactly what I need to know. I will probably go with the 1.5" then due to the fact that I am around 250lbs.
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