Bike Forums - View Single Post - Seatpost size: 27.0 or 27.2 mm

11-29-22, 04:54 PM

#18

FBinNY

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Quote:

Originally Posted by ser_gio

.....Either the seat tube has some corrosion or impurities inside, or perhaps the tolerances of the seat post is not that great. I bought it from Amazon for about $20 (FOMTOR Bicycle Seat Post). I will check inside the seat tube as well as measure the seat post diameter to confirm. Thanks very much!

It also helps to let the bike itself tell you what's happening.

If a post is tight from the beginning, and doesn't seem to get tighter as you go deeper, then the issue is distortion of the seat lug, or sometimes a burr in the slot.

OTOH if it starts OK and gets tighter after a few inches, then it's an overall size/tolerance issue.

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