Old 06-23-05 | 04:32 PM
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EXCALIBUR
Proud To Be An American
 
Joined: Jun 2005
Posts: 363
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From: USA

Bikes: 2004 Giant Cypress SX 2006 Giant OCR 3

The two tire sizes you mentioned are completely different sizes and are not interchangeable. If you want to upgrade your bike to 700C, you will need wheels with 700C rims. Also check to make sure the brake pads on your Trek will reach the 700C rims. 700C's diameter is smaller than 27 x 1 1/4 inch.
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