I want to get a vintage mtb to throw some parts I have laying around on. I was wondering do any of the frames from the early to mid 80s have 26.8-27.2mm seatposts or was that a later thing?
93EXCivic
Some do, but I owned many that were totally odd sizes on lesser models. I know my '96 Cannondale SV2000 had a 27.2, but that's the first one I owned that I can remember.
Typically 26.8 or a 27.2 might be more prominent, but there were(are) tons of seatpost sizes. 26.6 and 27.0 were also used as well as others.
27.2 was (is) a normal Reynolds ID, and many (most) MTBs of the time were not built with Reynolds tubing. 26.6, 26.8, 27.0 were by far the most common, in my experience. As time progressed, 27.2 IDs on seat tubes became de rigueur on steel frames.
Specialized and Trek both had models that had 27.2 seatposts. If you expand your search into the 90s, 27.2 will become much more common.
Note, you CAN use an expandable reamer to open up a seat tube, but you need to choose your target carefully. [Cheap] tube walls are usually not much more than 1mm at the top on steel frames, and you would have to remove 10% of that to open a 27.0 to 27.2.
Specialized and Trek both had models that had 27.2 seatposts. If you expand your search into the 90s, 27.2 will become much more common.
Note, you CAN use an expandable reamer to open up a seat tube, but you need to choose your target carefully. [Cheap] tube walls are usually not much more than 1mm at the top on steel frames, and you would have to remove 10% of that to open a 27.0 to 27.2.
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