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Hi, I'm early in the process of converting a Trek 330, either 88 or 89 (Tru Temper tubes) into a SS commuter but cannot find a reference for seatpost diameter. Sheldon Brown does not have it. I know it is less than 26.8 and more than 26.0 from my old parts. Any help greatly appreciated.
 

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Most bike shops have a tapered guage called a seatpost sizing rod. Every shop I worked in had one and we would check frames for free.

 
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