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The rear wheel on my Cannondale has been having freehub play for some time now. I've tried using an hex key to tighten the freehub, but to no avail. The wheel is a WH-R550 rear wheel.

The 11mm hex key I've tried is too big. The 10mm hex key doesn't catch. I had tried a 10mm hex key on another freehub (from a Giant OCR) and it had worked, but it seems like the splines on this Shimano wheel are preventing the hex key from catching.

Could somebody tell me how I could tighten this? I brought the wheel to a bike shop, Roy's Cycles in Brooklyn, but the mechanics there didn't seem like they knew what they were doing and told me to get a new wheel.

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It's a 10mm hex. A ball end probably won't catch right if that's what you were using.

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  • It was a 10mm hex key like this one: (images-na.ssl-images-amazon.com/images/I/…). Someone mentioned that it could be that the fixing bolt had gotten stripped. Do you know how I could identify that? This is my first time really inspecting and working with a freehub.
    – Alykin
    Aug 18, 2020 at 0:41
  • You're poking the long end in through the right side? Stripping those would be very difficult.
    – Nathan Knutson
    Aug 18, 2020 at 1:42

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