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Mountainbiker has roadtire question?(4 posts)

Mountainbiker has roadtire question?Learux
Jun 22, 2003 6:23 PM
I dont know much about any other tires then MTB ones.
My wife has a bike with 700 * 38c Nimbus EX tires (specialized)

She wants some more traction I found some Ritchey 700 tires

700*35 and 700*40 wich one of these will fit, will they both fit?

The 38c tires have about 4 mm clearance on each side to the chainstay. Will a 40 mm tire then fit. I mean is a 40 2 mm wider then a 38c?

The rims are 622 * 18. These numbers dont mean anything to me.


Tx for replies.

re: Mountainbiker has roadtire question?BergMann
Jun 22, 2003 7:49 PM
Both tires should fit. A 40 _should_ only be 2mm wider than a 38 tire, but remember these are nominal sizes, just as every MTB manufacturer's 2" tire is a slightly different size, these will vary too.

Be sure to check for clearance at the brake caliper and bridge -- 40 mm is an awfully big tire for a road bike, so I would tend to err on the side of more clearance if there's any doubt as to whether you have enough.

Ignore 622x18 designations on the tire -- these merely indicate yet another idiotic, failed attempt to come up with yet another non-intuitive "norm" for tire size designations.
re: Mountainbiker has roadtire question?Spoiler
Jun 22, 2003 7:53 PM
The numbers on the rim are supposed to match the rim's measurements. The 622 means that the diameter of the BEAD of the rim is 622mm. The 18 means the width of the rim measured between the two walls is 18mm. The rim width is measured between the flanges.
If Specialized and Richey manufacture their tires to accurate measurements, it should fit.
A 40 will be 2mm wider than a 38c; 1mm closer to the right chainstay and 1mm closer to the left chainstay.
Thank you gentleman (NM)Learux
Jun 22, 2003 7:58 PM