• the '42' refers to end to end, not c-c measurement

    .

    also the 25.8 clamp is the size adopted by 3T for some of its road bars, IIRC. I've used a 25.8 bar (not this one) in both a 26.0 and a 25.4 stem and both were OK for me.

    This was used on the track in a 26mm stem

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