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This is my bike:

https://www.giant-bicycles.com/au/xtc-27dot5-2-2014

Stock rear wheel axle in the hub is broken. I couldn't find replacement axle so I need a new wheel.

  1. I want to use my old disc brakes. Will certain wheels only accept certain disc brake sizes?
  2. I want to use the old drive train / cassettes. Will certain drive trains / cassettes only fit on certain wheels?
  3. I need a new quick release for my back wheel because the old one's grooves wore away. Will all quick release axles work for my bike? (ie. http://www.chainreactioncycles.com/au/en/hope-qr-steel-skewers-rear/rp-prod31896)
  4. Can I fit a different sized wheel on the back than in the front? Would that cause any problems?
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  • You may also need to consider the hub width - although I think that all quick release MTB rear wheels are 135mm. I'm not totally familiar with mountain bike standards, someone please correct me if I'm wrong. Also be aware that there is a range of rim widths available.
    – Argenti Apparatus
    Commented Jul 11, 2017 at 18:02

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  1. The wheel's hub has one of three possible rotor mounts - there's 6 bolts, two sizes of centerlock, and a very small chance of something else weird. https://ep1.pinkbike.org/p4pb12413095/p4pb12413095.jpg

You need a hub that matches your rotor's mounts. And yes there are adapters available, but you should buy what fits properly. Do buy new bolts rather than reusing the old ones.

  1. You have a 10 speed cassette, so you need a hub that takes a 10 speed cassette. I believe 8-11 are all the same depth but the inter-cog spacing drops.

  2. You probably will get a new skewer with your new wheel. They're relatively cheap, you probably want a 135mm long one for the rear. Your bike does not suit through-axles so you require QR-based wheels, or wheels that have adapters for QRs. Wearing away like this might be a sign of something else being wrong.

  3. Yes, but it gets messy very fast. Refer to the large collection of existing Q&A on this:

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    Fitting a different size rear wheel will affect the steering geometry and gearing, potentially making the bike unsafe to ride. There are plenty of 27.5 aftermarket wheels available at all levels of price and quality so there is no reason to consider anything else.
    – Argenti Apparatus
    Commented Jul 11, 2017 at 17:56

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