Leif-fire-eater

Ok on my commute this morning I'm holding a track stand. When I go to sprint out of it the crank arm slips about an eight of a turn. I compensate and keep going, but it scared the crap out of me. It also slipped when throwing a skid a bit later and once again coming out of a trackstand. Any help as to what this could be and how serious would be nice.

queerpunk

what's your hub like? it could be stripped. what kind of hub and cog are you using?

terrapin04

Tighten up those chainring bolts

Leif-fire-eater

Man I'm afraid of it being the cog. It's a surly hub with a eai cog and dura-ace lock ring. I've been running it for two months with no problems until today.

queerpunk

eighth of a turn might be more than lose chainring bolts though

i was scared ****less when my chainring bolts were lose and i thought that my hub was stripped...

Leif-fire-eater

hmm I'll check the chainring bolts. That was something I installed without the proper tool. Used a screwdriver. So I'll check that. I'm just worried about riding home tonight and stripping the hub crossing the williamsburg bridge.

shants

i'm afraid to say that it's probably to do with your rear hub -- the cog/lockring. good luck.

queerpunk

yeah. a lot of times hubs can be stripped if they're installed improperly-- did you do it yourself?

shants

might not even be stripped, mind you. a lockring that was not fully tightened can work its way loose and allow the cog to spin back without stripping threads. i've seen this happen several times on friends' bikes.

Leif-fire-eater

yeah I did do this myself. but it's something I've done numerous times before I've been riding fixed about 5 years and have done almost all the work on my bikes. But I'm still afraid.

teiaperigosa

I would take the lockring and cog off and check...
hope you greased those threads well

Leif-fire-eater

ok the grease or not to grease argument again. What is the benefit of greasing?

absntr

The curious mind in me is wondering why you're not checking it out right now or seeing if it is indeed play in the cog/lockring instead of waiting for people on the internet to guess...

teiaperigosa

I've never heard of a 'to grease or not to grease' argument concerning ANY THREADED PARTS ON A BIKE.... and especially hub threads

GREASE!!!...

or maybe I'm just buggin'

edit:...oh the benefits...grease is a lubricant that allows, first of all, you to not be sliding straight metal along metal....you'll be able to get the cog (and lockring)on tighter, you'll be able to get it off easier, and you'll do less damage to the threads

Leif-fire-eater

stuck at work in a building that won't let me bring in a bike. But tonight I'll definitly be ripping into the wheel

absntr

Ah, gotcha. Be careful on the way home.

mattface 

My guess is the lockring got just a touch loose. Don't stomp hard on it on the way home. If it hasn't stripped yet, removing and retightening the cog and lockring will do the trick. Sounds like it's slipped 3 times, so chances are no damamge yet. Don't apply any back pressure on the way home working that cog back and forth is what will strip it. If you don't have a brake I wouldn't even ride it home.

jonb

Lockring and cog is my vote. Its a little loose and then you pedal off and the torque tightens it back down, then the back pressure from a skid or trackstand loosens it up again.

teiaperigosa

I wouldn't ride it at all if you have another way of getting home (ie...walking)...

I had a loose crank bolt once...rode it to the bike shop to tighten it up (didn't have the tool)...on the way there...the bolt came out and my crank fell off...
the only thing that really happened was that the bolt stripped, and then I eventually lost it...crank bolts are easy to come by though

in your case, you really don't wanna do any more damage to anything...if you can...walk it

BostonFixed

Here's a simple rule regarding grease and components:

Grease ALL metal-to-metal contact.

Except chains, which should be lubed.

Lunigma

take everything off, grease, and rotafixa.

huhenio

Tighten up EVERYTHING .... is not that much!

Remember all those moving parts that YOU DO NOT HAVE anymore?

delay

I would say, if you have a front brake, use it the whole way home. Try your hardest not to apply any back pressure. That said, several hub thread can strip (this happened to me) allowing some play (about 1/8 of a rotation) without the whole hub stripping. More than likely it starts as a loose lockring that doesn't get the attention it deserves.

cavernmech

And square taper b.b. spindles.

BostonFixed

That's a touchy subject.