I've acquired a pair of old Alexrims DC 4.5 Disc 26" MTB wheels with Formula hubs, but the rear wheel is missing the axle. I've been reading various posts about how to measure / replace the axle, but haven't found anything that makes me confident enough yet to buy a replacement. Is there an easy way to tell what size / type I need?

I initially presumed I would just need a standard axle for 5mm QR skewers, but when I measured the internal diameter of the hub it was 12mm. So is this hub actually designed for a 12mm bolt thru axle?

Any advice or pointing in the right direction would be greatly appreciated!

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  • Please add a picture of the hub, this will allow conformation of what type it is. – Argenti Apparatus May 1 at 12:08

If the hub has a smooth, straight-walled 12mm diameter hole through it, yes it's for a 12mm through axle. (A 'through axle' isn't really the axle of course, it's a fastener that goes through the hollow axle in the hub.)

If this is the case, there are through-axle to quick release adapters available that you can use.

BTW, have you checked that the hub width is correct for your frame?

UPDATE: Nope not through-axle. Just missing axle and bearings.

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  • The front and rear dropouts are both 10mm. The front hub has an axle for 5mm QR skewers, which is ideally what I would want on the rear as well – MarkyMark May 1 at 12:27
  • @MarkyMark I mean dropout spacing, 135mm is standard for QR, 142mm or more for TA on the rear. However, your pics show you do not have a TA hub – Argenti Apparatus May 1 at 12:30
  • The distance between the rear dropouts is 135mm. So does that mean I am looking for a 135x5mm rear axle and not 135x12mm? – MarkyMark May 1 at 12:37
  • You want a QR axle of the correct length for a 135mm hub (145mm). Rear axles are 10mm x 1mm thread pitch. Then of course you need matching cones, spacers, nuts and bearings. Have you ever rebuilt a hub before? – Argenti Apparatus May 1 at 14:06
  • No this will be my first attempt. Are there any particular brands you'd recommend looking at? – MarkyMark May 1 at 14:44

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