Advice please for Hope hub with a snapped rotor bolt

[ciderlad65]

Hello, so i purchased a set of Hope wheels fitted with a pair of as new IRC Kujo's (which is really what i wanted) with a single rotor bolt on the front hub snapped by the previous owner and where advertised as such, so on receiving them i thought an easy fix was in order, cue TWO snapped drill bits later :facepalm: now stuck fast in the bolt, I'm now in danger of ruining the bolt hole, i could use the wheel with v brakes as the rims are D521's, or just use 5 bolts to mount a disc and run them on my canal, commute winter bike, but ideally would prefer to remove the unwanted metal, any advice would be gratefully received, cheers chaps

 

[hamster]

Even with a helicoil that hole looks too large. My thought would be to drill the lot out, re-tap and fit the next size up. You will of course have to drill out one hole of the disc to suit.

An alternative is to use a sparkerode machine to remove the remains of the bolt.

 

[KermitGKona88]

Re:

Use a much smaller drill then work your way up and use an Easy out.

https://www.ebay.co.uk/itm/Screw-Stud-E ... Sws0JadZsM

 

[ciderlad65]

agreed hamster the lot needs removing, sparkerode machine??? would an engineering firm have one of these???

 

[RickTheUncivil]

Re: Re:

Use a much smaller drill then work your way up and use an Easy out.

https://www.ebay.co.uk/itm/Screw-Stud-E ... Sws0JadZsM

Had the same issue, this method worked fine for me.
If you have access to a pillar drill and clamp rather than relying on holding the tool theres less chance of drilling sideways etc. but with the bolt being (generally) harder than the surrounding hub its easy to damage.

 

[ciderlad65]

cheers Rick n Kermit, it was going well and i was almost through then i snapped the 2nd bit!!! tried again but kept sliding off the broken bits stuck in the bolt, then got disillusioned, a pillar drill and clamp would be a much more stable platform, unfortunately don't have one!!

 

[jimo746]

Re:

Just leave it, 5 bolts is plenty to keep the disc rotor in place. Even for arduous riding.

 

[hamster]

agreed hamster the lot needs removing, sparkerode machine??? would an engineering firm have one of these???

Should do - especially higher-end ones like toolmakers. Also known as electric discharge machining. It's typically used for removing broken taps from costly workpieces.

 

[CTK]

Steve Peat used 3 bolts on his DH bike at some point iirc. Just left the other holes empty.

 

[LongboardSi]

Re: Re:

Just leave it, 5 bolts is plenty to keep the disc rotor in place. Even for arduous riding.

This. Five is plenty...

Or if you're not comfortable with that and you've had a bargain on the Kujos then pass them on supercheap to somebody who's fine with running five.

I've often run only three bolts in my rotors...

Si F