# How do I know what size clamp to get?

## How do I know what size clamp to get?

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 / 𝜋 = 31.8mm. If you have no tape, then use a piece of paper (or string).

## What sizes are bicycle seat posts?

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 I know what size seatpost I have?

To find out the diameter of your seatpost, you must remove the seatpost from the bicycle frame and look for the size, which is stamped just below the “Minimum Insert” line toward the bottom. The number will be a three-digit number (such as 26.8 or 27.2 or 31.6).

Are 1 and 1.5 tri-clamp the same?

1” and 1.5” TriClamp use the same clamp. The ‘ferrule’ is the same. The difference is the pipe diameter. To demonstrate, a 1” Tee is attached directly to a 1.5” Tee.

### Why is it called Tri-clamp?

The phrase ‘Tri-Clamp’ was originally used to describe clamps comprised of three segments, but now the name is more generally used to refer to all types of hygienic connections and fittings. Tri-Clamp fittings are connections for pieces of pipe, which facilitate easy disassembly and cleaning.

### What are the sizes of bicycle seat posts?

Seat Post Diameter. 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.

How to measure bike seatpost?

Step#1 – Cut out a small strip of paper,say 1″ wide by 12″ long

• Step#2 – Wrap this paper strip around the seat post;
• Step#3 – Mark the both sides of the paper strip with a pencil;
• Step#4 – Unfurl the strip and measure the distance between 2 marks;
• Step#5 – Use this equation:
• Diameter (D) = Circumference (C)/Pi
• What is the diameter of a mountain bike seat post?

Bicycle seat post diameter on British or Italian bike frames is typically around 1 1/8 inches in diameter, or 28.6 mm.

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