Sprocket too wide, no room for lockring

[paddo]

Re: Sprocket too wide, no room for lockring « Reply #15 on: April 11, 2009, 01:15:13 PM »

i threaded my old hub when i did a skid and ripped the lockring off. ran it without a lockring for about a month and never had an issue... loctite + rotafix + riding up some big hills worked fine..
didnt skid on it tho. but i didnt wind it off once.

also, a sprocket and a lockring on the same thread in the same direction should work without a problem. as long as the lockring is done up to a different torque to the sprocket.

I've used double nuts on heaps of stuff for cars (mainly on turbo exhaust manifolds where the vibrations are high) where one nut would rattle off by itself, but with 2 nuts worked fine.

obviously a reverse thread is ideal.

[Hakucho]

Re: Sprocket too wide, no room for lockring « Reply #16 on: April 11, 2009, 06:47:56 PM »

I've used double nuts on heaps of stuff for cars (mainly on turbo exhaust manifolds where the vibrations are high) where one nut would rattle off by itself, but with 2 nuts worked fine.

Although in that situation, there's no torque trying to unscrew either nut.

Asssuming I go with Rotafix + Loctite, where exactly do you put the Loctite? On the part of the hub that the sprocket's thread engages with? Or on the part of the hub that the sprocket buts up against? And once it's dried, how hard is it to remove the sprocket again, e.g. to try a different gear ratio (something I might be doing a lot once I get my fixed gear bicycle finished)?

[Bender!]

Re: Sprocket too wide, no room for lockring « Reply #17 on: April 11, 2009, 08:03:33 PM »

You'll want to use a loctite called "super stud lock 262" It's the strongest one last time I checked. You can get it off but you'll have to rota-fix it off with someone holding the bike really well. You have to clean the threads of the hub, lockring and cog with brake clean first (or other appropriate solvent) then apply the loctite to the threads of the cog and lock ring just before you put them on. Rota-fix the cog up as tight as you can then stick the lockring on as tight as you can. Make sure the lockring you are using has nice crisp rebates in it so you don't go slipping off.

As good as this solution is in the short term, still go out and get your self a proper track wheel when you can afford too. And run a brake, if in the unlikely event it does come undone you'll want to be able to stop.