Thread: 27" and 700c wheel question
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Old 08-27-19 | 04:52 PM
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HillRider
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Joined: Aug 2005
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From: Pittsburgh, PA

Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!

A 27" rim is ISO 630 meaning the bead seat (where the tire bead seats) is 630 mm in diameter. A 700c rim is ISO 622 or 622 mm in diameter. So, the two are 8 mm in diameter different and the tires do not interchange.
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