Seat post diameter problem...

rg12

100 kW
Joined
Jul 26, 2014
Messages
1,584
I'm ordering some russian enduro frame that my friend has so I measured the seat post diameter and it's 30.7mm
It doesn't seem like a standard, although he just took it from his mtb and installed it there.
Any ideas what to look for on ebay?

Also, I want to know which bottom bracket to order.
The frame hole for the bottom bracket from side to side is 67mm wide.
I think the bottom brackets are measured from the bottom bracket side to side and not the frame which is much wider than my measurement.
 
30.6mm is a customary seatpost size. Get one of those.

68mm is the most common bottom bracket width.

Edit:
30.8mm is also a normal seatpost diameter. Since posts are usually slightly undersized, that's probably what your friend has if you measured the post and not the bore.
 
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