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  1. #1
    mtbr member
    Join Date
    Oct 2009

    Wheel Question...

    Been riding quite awhile but have a noob question here...

    Looking at buying a new 29" wheelset. What is the difference between 9 x 100 and 15 x 100? What does that mean?

  2. #2
    Fat-tired Roadie
    Reputation: AndrwSwitch's Avatar
    Join Date
    Nov 2007

    Re: Wheel Question...

    It's two different axle standards, confusingly stated.

    The traditional front hub is 100 mm wide over the lock nuts. The axle is wider, and has a 9 mm diameter. It fits into open dropouts and the hub is secured with a quick release skewer. The axle is part of the hub assembly pretty much full-time.

    There are also a couple of through-axle standards. In those standards, the hub doesn't include the axle, but is sized for a specific one. The axle slips through bores in the fork and through the bearings in the hub. How, exactly, they're secured varies. Some, including mine and a lot of XC-oriented through-axles, have a 15 mm diameter. The part of the hub that presses against the inside faces of the fork where it mounts is still 100 mm wide.

    Give us a little more background - what does your front wheel have now? What fork do you have? Post some pics of your front end. Get up close and personal around the front hub.
    "Don't buy upgrades; ride up grades." -Eddy Merckx

  3. #3
    mtbr member
    Join Date
    Jan 2012
    A wheelset can come with changeable endcaps. So you can use them with different setups. And you can use a good wheelset on your next bike which will probably have a 15mm fork and 142 rear.

  4. #4
    mtbr member
    Reputation: SpeshulEd's Avatar
    Join Date
    Oct 2013
    Don't forget 20x110!

    Cuz if you're like me, you read the specs for your bike without actually measuring and bought a 15x100 wheelset and then received the wheelset and the bike and realized the specs were wrong.
    Hey guys, lets go play bieks!

  5. #5
    mtbr member
    Join Date
    Oct 2009
    Here are some pics. I was thinking it was the 9 x 100 due to the QR/dropout design. Not getting a new fork just new rims. Wheel Question...-front-1.jpgWheel Question...-front-2.jpg

    Thanks for the previous help and that to come!

  6. #6
    Formerly of Kent
    Reputation: Le Duke's Avatar
    Join Date
    Mar 2009
    Yes, that's 9mm QR.
    Death from Below.

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