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Seatpost Size Database

23-Oct-2013


Most steel bicycle frames have tubing of standard outside diameter. Frames made to British or Italian standards will typically have 1 1/8" (28.6 mm) seat tubes. Older French bicycles used 28 mm. Old American style, commonly used on BMX bicycles and other bicycles that use one-piece-cranks, uses a 1" seat tube. Standard outside diameter accommodates standard lugs and clamp-on parts such as front derailers, pulleys and other cable guides, pump pegs, etc.

High-performance bicycles are made of thinner-walled tubing, so the hole will be larger if the outside diameter is kept the same.

As a result, a larger seatpost size is often a sign of a higher-quality bicycle. This has resulted in a de facto standard of 27.2mm for high-quality bicycles that have 1 1/8" O.D. seat tubes. Since high-quality seatposts are widely available in 27.2, most high-end aluminum and carbon fiber road bicycles also use 27.2.

A recent trend to oversized tubing has resulted in the introduction of oversized seatposts (anything over 27.4 would be considered oversized.) These are more commonly seen on mountain bikes, where the longer seatposts can use the extra strength.

Diameter is not the only factor affecting compatibility. Using a carbon-fiber seatpost in a metal frame, or vice versa, invites problems. Metal should be greased, but carbon fiber should not be. The seatpost clamps of metal frames easily damage carbon-fiber seatposts.

Accuracy

Most of the size information on the list below was provided by people like you. We have no way to check the accuracy of the data. It should be noted that frames can be reamed out to take a larger-sized seatpost, and sometimes a replacement seatpost may be a slightly different size than the original.

Measuring is better than guessing. Most better bicycle shops will have a set of seatpost-sizing rods like this:

Seatpost Sizing Rod

Alternately, you could check the diameter of a seatpost that fits. The diameter is stamped on many seatposts (usually on the part that is fits inside the bicycle's seat tube and gets scratched up and covered with grease, *sigh*). You also could measure the diameter using a dial indicator caliper.

National as well as Historical Trends

The majority of steel bike frames possess tubing associated with standard outdoors diameter. Frames made to Uk or even Italian standards will certainly typically have One 1/8" (28.6 mm) chair tubes. Older French bicycles utilized 28 mm. Old United states design, commonly used upon BMX bicycles along with other bikes that use one-piece-cranks, uses a One" seat tube. Regular outside size accommodates regular lugs as well as clamp-on components for example front derailers, pulleys along with other cable guides, pump motor pegs, etc.

High-performance bikes are made from thinner-walled tubing, therefore the hole is going to be bigger when the outside diameter is actually kept exactly the same.

Consequently, a larger seatpost size is often a sign of the higher-quality bike. This has led to the de facto regular associated with 27.2mm with regard to high-quality bicycles which have 1 1/8" O.D. seat tubes. Because high-quality seatposts are widely available within 27.2, the majority of high-end light weight aluminum as well as carbon fibre road bicycles utilize 27.2.
A newly released trend in order to oversized tubing offers resulted in the introduction of oversized seatposts (anything at all more than 27.Four will be regarded as oversized.) They are more commonly observed upon mountain bikes, in which the lengthier seatposts may use the additional power.

Size is not really the only real element affecting compatibility. Utilizing a carbon-fiber seatpost within a metallic framework, or even vice versa, invites issues. Metallic should be greased, however carbon fiber should not be. The seatpost clamps associated with metal frames very easily damage carbon-fiber seatposts.

Accuracy

The majority of the dimension information on the list beneath had been provided by individuals like you. We now have no way to check the precision from the information. It should be noted which frames could be reamed out to have a larger-sized seatpost, and sometimes a replacement seatpost may be a slightly different dimension compared to original.

Measuring is better than guessing. The majority of better bike stores may have a set of seatpost-sizing rods such as this:

Seatpost Sizes Rod

Alternately, you can check the diameter of the seatpost that fits. The actual diameter is actually stamped upon numerous seatposts (generally within the component which is suits within the bicycle's chair tube as well as will get scratched upward as well as protected along with grease, *sigh*). You also might calculate the actual diameter utilizing a dial indicator caliper.
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