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Discussion Starter · #1 ·
Hi folks. I'm hoping for an assist here, but it seems like a long shot.

I have what I believe is a 1991 Diamondback Sorrento frame, and I'm trying to figure out the correct seatpost diameter. Does anyone have this information at hand? I've tried a 26.2 post (too big) and I've tried a 25.4 post (too small).

I suppose that leaves 25.8 or 26.0 Anyone know for sure?

Thanks in advance for any help,

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