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I have a Pro2 Evo on the back of my Rocket. It's a 12mm bolt through with a Syntace X12 axle. It's recently developed a side to side wobble.
Now my first thought was that the bearings were on their way out, but out of the bike I can't feel any wobble at all, and it spins really well.
So I tried popping the axle through with the wheel out, and there's a fair bit of play there - both through the hub itself and on the end caps.
Is this normal? Or have I somehow managed to wear out the inside of the hub (or possibly the axle)?
Any ideas STW?
Idon't think the axle needs to be a really tight fit in the hub. A secure fitting relies on the clamping force generated by the axle pulling the rear dropouts together against the endcaps of the hub. The end caps should be a snug fit in the drop outs too. One thing to check is that the threads of the X12 axle are not worn out. I have one on my Liteville and the rear wheel started coming loose for no apparent reason. Turned out the threads had worn down to the extent it was slowly pulling out of the drop out. Eventually it stripped so it would just turn in there which was when it clicked what the problem was. A new axle sorted it out.
I did wonder that - if I really crank up the axle it gets better, but can still feel it. The threads seem OK - there's no movement on the X12 in the frame with no wheel in (though obviously I can't fully tighten it as there's nothing to pull against).
Edit - I'll check the fit of the end caps in the frame though, I checked them on the hub and they're fine but not the other way.
Is the hanger bolt tight? This holds the threaded insert into the frame on the drive side.
Ooh that's a good one, I've not checked that either. Will have a look at that too this afternoon.
Welshfarmer has it. The end cap on the non drive side moves in the dropout. It's very noticeable with the axle out, less so with it tightened up.
So I guess a proper fix is a new chainstay (pretty sure it's not the cap as it fits perfectly in the driveside dropout) but as a bodge I think I'll try wrapping a bit of copter tape around the end cap.
All I need to do now is find some copter tape.