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Can anyone help me I have a Colnago Steel Fork and i have bought 3 headsets to install it on my Colnago frame but none fit I have a Shimano, FSA Duron and an unbranded one none will fit the thread has anyone any idea please what I should get. Thank you

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TheHatter [770 posts] 5 years ago
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what frame is it? I have a 1990ish Master and the fork fitted fine with a new Campagnolo Record headset (also I think its illegal to fit Shimano onto a Colnago  4 ).

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monty dog [455 posts] 5 years ago
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All threaded forks are generally the standard 25.4mm ISO thread - only French is different and long obsolete

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Alan Jett [14 posts] 5 years ago
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Thank you for helping a novice builder out. This is the FSA Headset I bought Italian - 22.2 x 30.2/26.4
None of those sizes given match the one you give and I will search for one now on EBay. Most helpful thank you  4