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Old 06-21-10, 08:42 AM
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Scooper
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Originally Posted by tortoro View Post
Forgive my ignorance, but which frames were made with OS tubing?

best,
vc

Toronto
OS (oversized) tubing debuted around 1990. The way to tell if a specific frame uses OS or "standard" size tubing is to measure the tubing diameter with a caliper.

Standard Tubing: Top Tube = 25.4mm, Seat Tube = 28.6mm, Down Tube = 28.6mm

OS Tubing: Top Tube = 28.6mm, Seat Tube = 28.6mm, Down Tube = 31.8mm
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