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


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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