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Compatible Tire Sizes for 700cx40

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Compatible Tire Sizes for 700cx40

Old 10-19-13, 05:59 PM
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ender7
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Compatible Tire Sizes for 700cx40

Hello,

My bike came with 700cx40 tires. What size of tires will work on the rims if I wanted to change? I'm trying to find out my options.

Thank you.
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Old 10-19-13, 06:20 PM
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rhenning
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Most likely anything from 700c x 35s to 700c x 45s will fit the rims. It will depend on the frame clearance for the larger sizes. Roger
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Old 10-19-13, 07:11 PM
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Wilfred Laurier
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minimum size is limited by the width of the rim
the tire must be wider than the rin

maximum size is limited by the frame and fork
too large tires will rub
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Old 10-19-13, 07:36 PM
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Jeff Wills
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Originally Posted by ender7 View Post
Hello,

My bike came with 700cx40 tires. What size of tires will work on the rims if I wanted to change? I'm trying to find out my options.

Thank you.
In general, any tire size that starts with "700" and ends in "C" will fit your rim. Also, mountain bike "29-inch" will fit the same rims. See: http://sheldonbrown.com/tire-sizing.html#fraction

What width will "work" is another matter. Very narrow tires will expose the rim to damage and won't cushion the ride much. Very wide tires can put extra stress on the rim and may not fit in the frame. According to this chart: http://sheldonbrown.com/tire-sizing.html#width , anything from 35mm to 50mm width should be OK.
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Old 10-19-13, 07:42 PM
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Wilfred Laurier
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Originally Posted by Jeff Wills View Post
In general, any tire size that starts with "700" and ends in "C" will fit your rim. Also, mountain bike "29-inch" will fit the same rims.
forgot to mention this
29 inch
or 29er
tires will also fit your rims
but most may be too wide to fit many hybrid touring or cross bikes
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Old 10-19-13, 10:56 PM
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All of the above assume that the current tire is in or near of the center of the range for your rim. That may not be the case, so the allowable size range may be offset one way or the other.

As pointed out above, the frame and fork clearance limit the maximum size, so measure how much room you have above or to the sides in the fork, and at the seat and chain stays. For vertical clearance every millimeter of room allows 1mm or added tire width. For side clearance every millimeter on either side allows 2mm of added tire width.

But don't take it to the max, because you still sneed some margin for error, both because wheels do go out of line, and tires vary in actual width vs the size marked on the wall.

If you're going narrower, you can push it down to about 1.5 times the inside rim width. If you don't want to remove the tire and measure, subtract 5-6mm form the outside rim width for a decent approximation.
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