Quick Answer: What Size Bolt For Bike Seat Post?

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’).

What size is a standard bike seat post?

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.

How do you measure a seatpost bolt?

You grab the clamp ears in the lug and measure that outside to outside. In the bolt you close it all the way and then measure inside to inside.

Are bike seat posts universal?

Are bike seats 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.

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Can any bike seat fit any bike?

While “most” bicycle seats are universal and interchangeable, not all bicycle seats are interchangeable or universal. However, the good news is that most modern bikes and brands have accepted that one fitting is best.

How do you measure bike stem bolts?

The bolt length is measured from the end of the threads to the bottom of the bolt head. That’s the length of the shaft, excluding the head. In the example it is 16mm long. The thread pitch is the distance between threads measured in millimeters along the length of the bolt.

How do I know my bike Post size?

You can easily measure the size of the post using a digital caliper and the metric calipers to check the diameter of the existing seat post. First, if you have an old saddle-post that attaches firmly, then you can measure its outer diameter for an accurate estimate of what you need to buy.

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.

Can I put a longer seat post on my bike?

Though some brands like to play exception to the rule, the majority of bikes are designed to fit a seatpost of either 31.6mm or 27.2mm. However, whilst you can always cut a seatpost that’s too long, you can’t add to the length if it’s too short.

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How are binder bolts measured?

Seatpost binder bolts are measured between the inner edges of the flanges when completely tightened while not installed in the frame, not the outer edges while installed.

What size seat clamp do I need for a 25.4 seatpost?

25.4 seatpost = 28.6 seatpost clamp.

How do you measure a quick release seat clamp?

Seat post clamp size refers to the inside diameter size of the clamp. This should correspond to the outside diameter of bike frame where the clamp is used. Just measure the outside diameter of the frame where the clamp will be used.

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