Insane Bicycle Mechanic
Join Date: Mar 2008
Location: other Vancouver
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Originally Posted by brad3104
The tires are clearly marked as 20x1.35 and 26x1.5 My question was, basically is there a way to fit the wrong tires size on a rim? or should i assume that since my bike is running these tire sizes now that i could safely order the exact same sizes again and it would be fine?
Or do i need to measure the RIM size and look at some kind of chart on sheldons website?
You can't go wrong getting the exact same size tire as what you have now.
No, you cannot fit the wrong "diameter" tires on your rims. Either the tires will a terrible struggle to mount and never seat properly or they will blow off as soon as they're partially inflated.
However, there is a great deal of leeway in tire width
that you can fit to your rims. Your rims will accept any 20" x x.xx" and 26" x x.xx" tire available. On the narrow end, you could install 20" x 1.10" (front) and 26 x 1.10" (rear), while on the wide end you could install 20" x 2.00" (front) and 26" x 2.35" (rear). Those tires will fit your rims
However, they're not ideal- the narrow tires on the AT-18 rims will be prone to pinch flats, and the wide tires put additional stress on the rims and may not fit in your frame anyway. There are people in both camps: "narrow is faster" and "wider is more comfy". It's an endless debate, one that's best answered by experimentation. If all you want to do is ride, just buy the same size as what you've got.
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