Mountain Biking - What a GOOSE

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The Goose
11-10-02, 07:44 PM
Just tried to stop the disc rub on my Hayes mech brakes by moving the caliper over,took the mounting bolts out for an inspection,put the top one in,no problem,put the second one in,still no problem until I went to nip it up[it was a very small nip at that]I had stripped the thread on Manitou Black Fork[Very soft metal]now my caliper is hanging by about 6 threads at the bottom. Has anyone else had this problem,it seems strange as the bolt went in quite easily.Are there any other fixes,besides tapping a new thread with a bigger bolt or a new outer casing for the fork.WHAT A GOOSE!!!!!!

Dirtgrinder
11-10-02, 08:10 PM
Is there enough room on the other side of the hole for a lockwasher and a nut?
Grendel
11-10-02, 08:10 PM
Hmm... you appear to have the same luck as I do when it comes to mechanical things. :p

Anyway, if you want to fix the threads and use the stock bolts for the brake bracket then you can try Heli-Coil inserts (http://www.emhart.com/products/helicoil/Default.htm) to repair the stripped thread. Basically you drill and tap the stripped part to a certain size and then thread in the Heli-Coil insert, after which you should have new threads of the original spec to work with. You might also want to invest in a torque wrench that can be calibrated in inch-pounds or the metric equivalents and look up the torque specs for the parts you're working on -- you'd be surprised how much is enough when tightening bolts on bikes.

Maelstrom
11-10-02, 10:03 PM
I think dirts suggestion is the cheapest. If the bolt isn't long enough buy a longer one with a locknut. :)
dirtbikedude
11-11-02, 07:55 PM
Heli-coil will work. The threads will also be stronger then if you were to just tap the hole. Putting a longer bolt on would also work IF there is room but it will make it a pain to adjust the caliper.

Slainte:beer:
a2psyklnut
11-12-02, 08:33 AM
Manitou forks have post mounts for disc tabs, so a longer bolt wont work!

Try the heli-coil method. If that doesn't work, I've had some luck with a different situation on a beater bike by filling the hole with "JB Weld" , letting it cure for about a week and retapping the threads. I'm reluctant to suggest this since it's for the brakes (read high stress area), but it may work.

Personally, I wouldn't do this to my bike, but if you're desperate, it may do the trick!

L8R