What are the sizes of bicycle seat posts?
- Bicycle seat post diameter on British or Italian bike frames is typically around 1 1/8 inches in diameter, or 28.6 mm. Older French frames use 28 mm seat posts, and older American style bicycle frames use a 1-inch seat post, according to Sheldon Brown, a bicycle mechanic and writer.
- 1 What are the sizes of bike seatpost?
- 2 Are all seatpost the same size?
- 3 How do you measure a tube seat?
- 4 How do you measure seatpost clamp diameter?
- 5 How do I choose seatpost length?
- 6 Are bike seat posts universal?
- 7 How do you buy a seatpost?
- 8 What is the seat tube length on a bike?
- 9 What is top tube length?
- 10 What is effective seat tube length?
- 11 What size seat clamp do I need for a 25.4 seatpost?
- 12 How do you measure a clamp?
- 13 What size seat clamp do I need for a 34.9 seatpost?
What are the sizes of bike seatpost?
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’).
Are all seatpost the same size?
Seatpost diameters generally range from 22 mm to 35 mm in 0.2 mm increments. The most common size is 27.2 mm (1.07 in) for most bikes, especially for the higher-quality models. BMX bikes commonly use 25.4 seatposts. In some modern bikes with thicker alloy or carbon tubing, larger diameters such as 30.9 mm are used.
How do you measure a tube seat?
Seat tube length is measured from either the centre of the bottom bracket to where the top tube and seat tube meet (Centre-Centre or C-C) or to the top of the seat tube (Centre-Top or C-T).
How do you measure seatpost clamp diameter?
The best way to make sure you’re getting the right size is to grab a set of calipers. Just ask your closest engineer- she’s bound to have a set. Stick the calipers on the outside of the seat tube, and measure away! You can also measure the inside of the seat clamp that is currently on your bike.
How do I choose seatpost length?
a) Seatpost should end at least 25 millimeters below the lower part of the horizontal tube weld to the seat tube. b) Total inserted length should be at least 90 mm from the top end of the seat tube.
Are bike seat posts universal?
Yes, most modern bike seats are universal and can be interchanged with different seat posts. The exceptions are if you have much older equipment or a specialized bike. It’s best to check the number of rails and the rail width on your saddle to ensure a correct fit to the seat adapter.
How do you buy a seatpost?
What seat post should you buy? Leisure riders just need to make sure they’re buying a seat post with the correct diameter and in the correct length. If you’re in doubt, remove your existing seat post and have a look towards the end of the post and chances are it will have the diameter and length stamped on it.
What is the seat tube length on a bike?
Seat tube length is the straight line distance between the centre of the bottom bracket and the top of the seat tube.
What is top tube length?
The effective top tube length is the horizontal distance from the top tube/head tube junction to the seat tube. This measurement has become significant as more and more bikes are designed with sloping top tubes. Effective top tube length is one of three options for defining the length of the front triangle.
What is effective seat tube length?
The effective seat tube length is the distance between the bottom bracket and the point at which a virtual horizontal top tube would intersect the seat tube. For a related dimension, see Effective top tube length.
What size seat clamp do I need for a 25.4 seatpost?
25.4 seatpost = 28.6 seatpost clamp.
How do you measure a clamp?
If you don’t have callipers then you can use a simple measure tape. Just wrap around the bar at the point you want to attach the Oi to get the circumference size and then divide by pi (…. mmm) to get your diameter e.g. 99.9mm / = 31.8mm. If you have no tape, then use a piece of paper (or string).
What size seat clamp do I need for a 34.9 seatpost?
34.9mm Aluminum Alloy Seat Post Clamp: 31.6mm Seat Post Clamp diameter: 34.9mm. Seat Post Fit: 31.6mm.