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  1. #1
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    Jet9 alloy rear axle question

    I have a 2011 Jet9 alloy frame and am trying to figure out what rear hub to go with. The Niner Encyclopedia shows a 142 x 12 spacing. So my question is what is the difference between a 142mm QR and a 142mm thru axle? Thanks in advance. Ehren

  2. #2
    Purveyor of Fine 29erness
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    The newest air-formed Jet 9 features the 142x12mm rear axle spacing. Your older hydroformed frame has 135mm spacing, and will take a standard QR rear hub.

    The information can be found on the next page down of the Encyclopedia

    Hope this clears things up for you.
    Happy trails!

  3. #3
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    Thanks Monkey. Next question: Avid 9 rear brake caliper requires an IS mount. The Sram manual says to consult your bike mfg since the #'s they show don't necessarily match the rotor size. The options are 140IS, 140, 160, & 180 (all post). With this J9 frame (2011), what mount do I need?

  4. #4
    Purveyor of Fine 29erness
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    You will need a IS to Post Mount adapter, that corresponds to the rotor size you will be using. Avid usually supplies these with the brakes. That frame will accept up to a 180mm rotor in the rear.

    Happy Trails!

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