Rounded off rotor bolt – HELP!
1. If it’s a hex head, try a larger size torx bit, might need a tap with a hammer to get it seated.
2. Then try cutting a slot in the head for a flat screwdiver.
3. If that fails cut the head off and get some mole grips on the bit that’s left.
You should be fine about the torque settings, just double check after first ride.Posted 4 months agodoncorleoniMember
As above…. But I would just leave it if you have installed and deal with it later. They are made of cheese so worst case just drill the head off and remove the remaining bolt with mole grips.
There used to be a chap I rode with who only ran 3 bolts to save weight 🙂 and common for these xc weight weeny types. Crazy.Posted 4 months agochopchopMember
Use a dremel or similar tool with a disc attachment, cut a groove big enough for the heftiest screwdriver you have then apply lots of downwards pressure whilst you use the screwdriver to take the bolt out.
I should imagine you’d be fine replacing it without torquing them all up again.
Edit, beaten to itPosted 4 months agoscotroutesSubscriber
If all else fails, grind/drill off the bolt head that’s damaged.Posted 4 months ago
Then remove the other five bolts and the rotor will come off.
You’ll then have a little stub of the failed bolt (the thickness of the rotor). Grab this with a pair of molgrips and twist to remove.
I’ve just transferred a pair of rotors from my 26er to my 29er wheels. All went well except for some reason one of the bolts on the rear rotor (the last I was doing) rounded off and I can’t get it out. I’ve got a replacement bolt but how do I get out the other bolt?
Also if I do get it out is it okay just to tighten in the new bolt as all the others are up to torque and were tightened alternately, or do I need to take them all out and start again?Posted 4 months ago
Argh! Just had another one go refitting it! Fortunately I managed to back if off. Perhaps I need to consider rotor bolt a ‘use once’ affair!
The torque settings on the SRAM Centreline rotor says to torque the bolts to 6.2 Nm which seems a tad high considering some Avids I had recommended 2-3Nm, can I torque them a little lower?Posted 4 months agobramblesummerSubscriber
Steve Peat raced for years without all the rotor bolts.
Is your allen key in good condition? If you’ve damaged 2 now then it’s likely worn. Worn allen keys will damage bolts very easily.
Best replacement bolts around are the Hope ones. Nice deep torx heads and good quality bolt. I’ve actually had a torx bit break before the hope bolt. Lots available from everywhere, only a few pounds, and can be fitted to any rotor or hub.Posted 4 months agojsyncSubscriber
You’ve got it out now, but would these be any use?Posted 4 months agoswdanMember
Yeah, could have done with that too a few months ago. Tried everything, large torx bit, cutting a slot in it, scree extractor. In the end did as above and drilled the head off, removed the rotor then used a pair of molgrip to remove the sticky out bit. Was pretty easy after I wasted two evenings on all the other methods!Posted 4 months agodemelitiaMember
Something to consider for future use are the Wera Hex Plus and Torx L-keys. Very well machined, especially the hex keys which have some patented geometry to allow either more force to be applied with much less chance of rounding the head of fasteners.
They aren’t cheap but they’re great value I think.Posted 4 months ago
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