Disc mount bolts

redvee

Why are they so easy to round off the torx fittings? Had to investigate the noises coming from the rear disc last night and ended up grinding the heads down on 2 bolts :x This wasn't caused by not putting the torxbit in deep enough, done the rounding off thing in the past so am extra careful.

nicklouse

poor tools is the general cause.

robbarker

You clearly know about full insertion of the bit - the sign of a good mechanic is that he always fully inserts his tool!

I used to use Torx bits but now have a Park T25 P handled wrench, which seems to be btter made. Ity's also worth inspecting the torx bolt for dirt and crap - a toothbrush and white spirit will clean them out nicely to give the wrench or socket a fighting chance.

The Big Cheese

as above, I bought a set of Torx keys from CRC for £5.00 - rounded off bolts and they were made from bloody cheese.

binned them and bought a Park Tools T25 and the difference is phenomenal.

Cheap tools are shite - fact, you think you're saving money but in the long run you are spending more..... as I found out myself.

Without sounding cliched - it's Park all the way for me now..... great kit

redvee

Got some spares today as my rear disc was held on with 3 bolts :shock: Not perfect but till I get decent bolts they will do, just nipped them up for now and will check in a few days. One question though, why torx fitting and not something like an allen head or 8mm hex head?

CraigXXL

Poor tools can cause the damage but more than likely is too much torque when tightening them. Most discs only need around 4nm of torque which is only hand tight. If you don't think this is tight enough then use a bit of thread lock to stop them working loose and also makes them a easier to remove as it stops the bolt seizing up.

Even more scary is stripping the thread on an alloy hub because you've over tightened a bolt.