What should and shouldnt you threadlock
I use it on caliper bolts, rotor bolts, cranks bolts.
What should you definately not use it on?
Liam

Shouldnt use it on bearings 

If it slips i fits, if it don't i wont. Ooo it rhymes.
Basically all i'm saying is i won't bother useing it unless something comes loose despite being fitted correctly.

i dont use it on caliper bolts, you dont need to just check them, same with rotor bolts, i would never threadlock rotor bolts.. the worst that could happen if you dont is you may lose one, what if one you have locked into your hub rounds off?

shame really as the red threadlock tastes really nice.
I've never needed it only on my giants backend as mensioned prior... stay away really nothing really needs it on a mtb.

All these people saying not to use on rotor or caliper bolts. Always have, planning on using split washers in future but I asolutely won't not run something to secure them. The amount of caliper bolts I've had randomly come loose and fall off is silly. That is, bolts that have JUST been fitted and tightened. Rotor bolts on the other hand are just a pain in the arse if they come loose but you can usually tell.

Also linkage bolts or any part that doesn't have something stretching the bolt sufficiently should be locked. If your worried about rounding, USE PROPER TOOLS.

If you use a mild/medium threadlock then you should never have nay disassembly problems over normal as it really is quite weak and is just acting as an anti-vibratory by filling the void between the threads.  Using a strong threadlock or studlock can cause problems when disassembling things such as rotor bolts.

some are