The frame size is.
Vintage road bike seatpost diameter.
Nos nib selcof titanium seatpost seat 25 4mm vintage 90s road racing bike mtb.
Nos campagnolo olympus seatpost 28 6mm 90s vintage mountain bike bicycle new.
There were different standards for different steel tubes.
It is very important that the bike fits your body in order to optimize comfort and performance.
Nos campagnolo olympus seatpost 28 6mm 90s vintage mountain bike bicycle new.
Gravel bike women bikes road bike touring men 27 in vintage bicycles titanium seatposts for road racing bikes.
While there are any number of post diameters out there most modern road and mtb bike frames accept a seatpost of either 27 2mm in diameter standard 30 9 or 31 6mm oversize.
Diameter is not the only factor affecting compatibility.
When it comes to buying a bicycle and especially a classic road bike it is very important to make sure that you choose a bicycle in the right size.
The most important dimension to consider is diameter as it must correspond to the internal diameter of your seat tube in order to have a snug fit.
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Our bike size calculator will help you to determine the correct frame size.
Using a carbon fiber seatpost in a metal frame or vice versa invites problems.
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Common diameters arey 30 9mm and 31 6mm.
Metal should be greased but carbon fiber should not be.
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These are more commonly seen on mountain bikes where the longer seatposts can use the extra strength.
Shimano deore xt early black seatpost 27 2mm.
Columbus built steel seat tubes in diameters 26 8 27 0 27 2 etc.