Readers ask: How To Know Bike Thru Bolt Size?

What is a 12mm thru axle?

From this specification we know 142mm is the hub width (or frame spacing) and 12mm is the diameter of the axle. Total Thru Axle length from the seat to the end of the threads.

How do I know what size quick release skewer?

Diameter: the skewer must fit inside the hollow hub axle. You may measure either the inside diameter of the axle, or the diameter of the present skewer. Most axles use a 5mm thick skewer. Skewers for wheels made for suspension forks may be 9mm (front) and 10mm (rear) in diameter.

Are all thru axles the same?

Why are there different sizes? As with many things in the cycling industry, thru axles are not standardized. Your thru axle standard will depend on your bike’s manufacturer and your bike’s intended use.

What size is my quick release?

Quick release wheels A quick release wheel has a hollow axle, 9mm in diameter at the front and 10mm at the rear, with a 5mm diameter skewer that passes through it.

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How do I know my bikes axle size?

For a front thru-axle, this is measured from the inside to inside of your fork. For a rear thru-axle, this is measured from the inside to inside of your frame at the drop-outs. The O.L.D. measurement is listed for many thru-axles, but isn’t necessary if you know the overall length.

How do I know if I have a thru axle?

Thru Axles Your bike has a thru axle if the “drop out” is a hole, rather than a U-shaped dropout. This provides added security because even if the lever on the end of the thru axle flips open, it is still threaded into the frame, holding your wheel on.

Are all quick release skewers the same size?

Not all skewers are compatible with all quick release wheels. There are different diameters and widths of skewers. Notably, many downhill bikes have beefier skewers that are built with a much larger diameter to be more durable. Bikes with wider and narrower axles will have less standard skewers too.

Are quick release wheels safe?

Know Your Quick Release Incorrect quick-release use is dangerous because these mechanisms hold the wheels in place. The most common mistake is simply turning the lever like a nut until the wheel seems tight. Used this way the lever and wheel can loosen as you ride leading to catastrophe.

What is a quick release skewer on a bike?

A quick release skewer is a mechanism for attaching a wheel to a bicycle. Wheels equipped with quick release mechanisms can be removed from the bicycle frame and replaced without using tools by opening and closing the cam lever, thus more quickly than wheels with solid axles and nuts.

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Can you convert QR to thru axle?

If it’s a front hub and your fork uses a QR, you can buy a new thru-axle hub and an adapter that lets you use a thru-axle hub in a QR fork. About $15 for the adapter. This will give a fractionally better bit of firmness, but primarily, if you change your fork down the road, you can get one with thru-axle.

Can I use quick release to thru axle?

Converting A Quick Release Bike to Thru Axles The best and easiest solution is to swap out your quick release fork for a thru axle fork. In most cases, you will also need a new front hub that is compatible with thru axles. 15 mm is the most common diameter for front thru axles.

How does quick release work?

A quick release axle has a 5mm rod with a camming lever on one side and a nut on the other and its function is to allow you to remove the wheel of your bicycle without the use of a tool. A quick release axle also allows you to remove the wheel without removing the axle. The axle will stay inserted in the hub.

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