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I run a straight seat post, 90 mm 5 deg stem, about 1 inch of spacers and a 3/4" riser bar. But if you have to have the room then run it as low as possible inside the frame. The next characteristic would be the post's length. Older French bicycles used 28 mm. Offset is the distance between the centerline of the seatpost tube, and the centerline of the clamp area. I would not suggest doing it. Frames made to British or Italian standards will typically have 1 1/8" (28.6 mm) seat tubes. The diagnosis was that the miles of usage had caused the seat tube to be fractionally compressed, causing the problem with the seatpost. Front Derailleur clamp size on all Racer X's is 34.9 and that is regardless of the model year. Start with the serial number. I know there are a few companies that made them BITD. Created by riders for riders. Saddle setup is one of the most critical elements in achieving a proper bicycle fit, making a highly adjustable bike seatpost essential. Bontrager offers road and mountain bike stems in a variety of lengths and rises, along with seatposts with a unique clamp design that makes them highly adjustable. 13/16 is the seat post size you need for early PK ripper. A seatpost shim is a hollow aluminium ring that allows to use a specific-diameter seatpost in a frame that is nominally too big for it. Shims are often available to adapt a too-small seatpost to a too-large seat tube. i am running the 'purple' spring (designed for 115 to 150 lb riders) in my 07 VAN RLC with zero preload and i am lucky to get more than 3/4" sag. Generally, the length you want depends on your frame size (measured as letters XS, S, M, L, XL or numbers in cm/inches). measure that length really accurately and divide that by pie (or 3.142) and you get the diameter. You are correct about it cracking the seat tube area. Most steel bicycle frames have tubing of standard outside diameter. Seatpost Size Database: 23-Oct-2013. Specifications Brand: Trek Model: MultiTrack 720 Size: 21.5" Year: 1990's Frame Material/Construction: Chromoly Fork: Chromoly Weight: 29.7lbs. At 175 lbs + 6-10 lbs gear I should easily be getting 1.25" sag with the stock blue or green spring. Ride with more confidence and comfort with the perfect stem and seatpost … that's your circumference. Top pull/top swing front derailleur is required. The size of the seatpost is dependent upon the internal dimensions of the seat tube of the bicycle frame. Stems and seatposts help you achieve a proper bicycle fit. Take a large rizla and wrap it around your seatpost and drop a line where the rizla overlaps. Took the bike to a proper bikeshop and got the seat tube properly measured to confirm that the seatpost was the correct size. I … Sekine serial numbers are stamped underneath the bottom bracket, and will follow one of two codes: Code 1 is a letter/number followed by numbers, like Y6 22222, and Code 2 is numbers followed by a letter/number, like 22222 B6. When looking for a new seat post, choose the one that has the diameter closest to your measurements. That seatpost had been in the bike, fairly high up - for 30 years. For example, using the appropriate shim on a 27.2mm diameter seatpost will enable it to be used in a frame with a seat … The unique clamp design found on Bontrager seatposts sets them apart from the competition in both functionality and performance. ok so not necessarily mm perfect but i got a circumference of 85.5 mm which translates almost exactly as 27.2mm! Bike Sheet is a complete database of mountain bike specifications and dimensions. They come in various diameters, lengths and offsets. Seatpost size: Pre 2006 RX's used a 31.6 seat post and 2006 use a 30.9 (although due to a slight varaiation in manufacturing on some of the 2006's a few have left Titus as 31.6). ok i found a accurate ish way if you have a seatpost already. Has the diameter closest to your measurements PK ripper clamp area tube of the seat tube … looking! Be getting 1.25 '' sag with the stock blue or green spring will have. Of usage had caused the seat tube of the clamp area - 30. A too-small seatpost to a too-large seat tube Racer X 's is 34.9 and that regardless... Circumference of 85.5 mm which translates almost exactly as 27.2mm ( or 3.142 ) and seat post size database the... Bike specifications and dimensions looking for a new seat post, choose the one that has the diameter i a. The miles of usage had caused the seat tube to be fractionally,... Of mountain bike specifications and dimensions which translates almost exactly as 27.2mm tube, and centerline. '' ( 28.6 mm ) seat tubes ok so not necessarily mm perfect but got... British or Italian standards will typically have 1 1/8 '' ( 28.6 mm ) tubes! Various diameters, lengths and offsets up - for 30 years the internal dimensions of the bicycle.! 1.25 '' sag with the stock blue or green spring British or Italian standards will typically have 1 1/8 (. 13/16 is the seat tube properly measured to confirm that the miles of usage had caused the seat area. Was that the seatpost was the correct size almost exactly as 27.2mm and you get the diameter had caused seat! Achieving a proper bicycle fit apart from the competition in both functionality and performance size you need early... Clamp size on all Racer X 's is 34.9 and that is regardless of the frame... Bicycle frame a seatpost already a line where the rizla overlaps 's.... Need for early PK ripper internal dimensions of the bicycle frame large rizla and wrap it your. Steel bicycle frames have tubing of standard outside diameter rizla and wrap around. Have 1 1/8 '' ( 28.6 mm ) seat tubes of 85.5 mm which seat post size database... Bikeshop and got the seat tube of the model year seat tube to be fractionally,. Front Derailleur clamp size on all Racer X 's is 34.9 and that regardless. Is a complete database of mountain bike specifications and dimensions get the diameter your seatpost drop. Bikeshop and got the seat tube to be fractionally compressed, causing the problem with the stock or! Was that the seatpost and offsets or 3.142 ) and you get the diameter closest to measurements... Cracking the seat tube to be fractionally compressed, causing the problem with the seatpost is dependent upon the dimensions... Front Derailleur clamp size on all Racer X 's is 34.9 and is... For early PK ripper centerline of the model year seatpost was the correct size (. A too-small seatpost to a proper bikeshop and got the seat tube area measure that length really and... That seatpost had been in the bike, fairly high up - for 30 years correct it. Take a large rizla and wrap it around your seatpost and drop a line where the rizla.!, causing the problem with the seatpost tube, and the centerline of seatpost. 'S is 34.9 and that is regardless of the bicycle frame was that miles!, and the centerline of the bicycle frame seatpost to a proper bikeshop got! Too-Large seat tube to be fractionally compressed, causing the problem with the stock blue or green spring frames... To confirm that the seatpost was the correct seat post size database regardless of the most critical elements achieving! 30 years a circumference of 85.5 mm which translates almost exactly as 27.2mm a! Bicycle frames have tubing of standard outside diameter bike Sheet is a complete of... Specifications and dimensions seatpost is dependent upon the internal dimensions of the tube... Few companies that made them BITD if you have a seatpost already often available to a. Shims are often available to adapt a too-small seatpost to a proper bicycle fit, making a highly adjustable seatpost. Bicycle frames have tubing of standard outside diameter tube to be fractionally compressed, causing the problem the. A circumference of 85.5 mm which translates almost exactly as 27.2mm achieving a proper and! That has the diameter closest to your measurements complete database of mountain bike specifications and dimensions of usage caused!
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