It is very important that the bike fits your body in order to optimize comfort and performance.
Vintage road bike seatpost diameter.
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.
The frame size is.
Columbus built steel seat tubes in diameters 26 8 27 0 27 2 etc.
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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.
There were different standards for different steel tubes.
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.
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The size 27 2mm is the most popular seatpost diameter for classic bikes.
Using a carbon fiber seatpost in a metal frame or vice versa invites problems.
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Diameter is not the only factor affecting compatibility.
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The older your vintage bike the more difficult it may be to find the right seat post for it.
Common diameters arey 30 9mm and 31 6mm.
Shimano deore xt early black seatpost 27 2mm.
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Our bike size calculator will help you to determine the correct frame size.