Readers ask: How Do I Know The Size Of My Bike Seatpost?

Are all bike seat posts the same size?

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’).

How do you measure a bike 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).

What size seat tube do I need?

The dimensions of the seat tube can vary from bicycle to bicycle, so when choosing a seatpost, it’s important to get the correct diameter. The most common diameter is probably 27.2mm, but other sizes between 21.15 and 35mm are often found, as well. Seatposts also vary in length.

Are bike seats a standard size?

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. Tapering seatposts often have a diameter of 22.2 mm (⅞ in) at the top.

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Can you cut a bike seatpost?

Cutting the post down is the proper way to do it really. Seat posts need to have a minimum amount of tube in the frame for safety though, so do some measuring and just cut off as little as you can get away with and file down any rough or sharp edges.

How do you tell bike frame size?

Look for a size label on the bottom of the seat tube first. The seat tube is the long tube that the bike seat post sticks into. If you look near the bottom of this tube, about 3 inches (7.6 cm) up from the chain sprocket, you’ll see a glued-on label that states the bike’s frame size.

How do I determine bike frame size?

2. How to measure bike frame size

  1. Find the top of the seat tube (this is where the seat post is held)
  2. Find the center of the bottom bracket (This holds the crank arms together)
  3. Measure the distance between these 2 points.
  4. Record this in both cm and inch to find the right frame for you.

What size seat clamp do I need for a 28.6 seatpost?

Note: The seat clamp diameter needs to match the diameter of your seat tube rather than your seatpost, which is a little smaller. For example, a 27.2mm seatpost (a size commonly found on road bikes) fits inside a 28.6mm diameter seat tube, so it’s a 28.6mm clamp you need.

Does bike frame size matter?

Registered. Frame size in and of itself doesn’t matter,what matters is how the frame fits you. Diamondback and Trek could measure frames differently,those bike bike could be close to the same size.

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Why are bicycle seats so small?

Bike seats do come in different shapes for different types of riding. Generally, the faster you ride, the skinnier the seat will be. This is because the faster you go, the more your body weight is supported by your legs and handlebars instead of the seat.

Do all saddles fit all bikes?

Bike saddle rails and materials The rails of a saddle create a frame under the seating area that fits into the clamp at the top of your seatpost. Most modern bikes conform to the same standard, so any reputable saddle will fit any reputable bike.

Is a wide bike seat more comfortable?

Wider is more comfy. Certainly, sleek racing saddles don’t look comfortable but wider seats create more friction and chafing when you’re doing lots of pedalling (say on the road, or in a race). In general, the more you ride and pedal, the thinner and less obtrusive a saddle should be.

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