I need to put a new set of chain rings on my bike. The crankset it’s going on is a Power2Max. I’m replacing the exact same chainrings I already had - Praxis 54/42. There are five Allen bolts attaching the chainrings. Is this something that is pretty easy to do, or should I try to have a bike shop do the swap? I’ve done a bit of bike stuff: derailleur adjustments, cassette changes, waxing chain, installing brakes, etc, but haven’t done chainrings before. I’m a bit rushed because I’m dropping my bike off for TriBike Transport this coming weekend. Thanks!
You should be fine. Depending on the bolts you may need a special wrench. Tighten the chainring bolts in a crossing star pattern. Check the zero offset (“calâ€) before and after swapping.
If you were changing chainring make, I’d suggest some way of verifying slope didn’t change, but that shouldn’t change on a straight replacement.
Thanks - seems straightforward enough. Five bolts to take out - tighten like lug nuts on a car when putting new rings on. Have torque wrench, so will torque to spec.
They’re probably Torx bolts and not allen (hex) bolts
.
Gave swapping the rings a try this afternoon. Kept having the inside bolts rubbing the frame when tightened down. Took apart 4x, and kept having the same issue - slight rubbing on the frame. Ended up over tightening one and stripping it. My road bike has identical crankset and rings, so I can use a bolt from there, but am wondering what I’m doing wrong. Any thoughts???
No idea why the bolts would rub on the frame. Chainring bolts are pretty straightforward. Were they backwards?
As long as the bolts are the same length they should be interchangeable.
No idea why the bolts would rub on the frame. Chainring bolts are pretty straightforward. Were they backwards?
As long as the bolts are the same length they should be interchangeable.
Eventually figured things out after lots of head banging against the wall (metaphorically speaking). I was using the bolts that had been on the old rings. I didn’t notice the new bolts that came in the package with the new rings. It looks like the design has slightly thicker rings, and as a result the profile of the new bolts is slightly thinner on the frame side. I think I took everything apart around ten times before realizing there were new bolts. Oh well, should be ok now…