I’m currently riding my stock Mongoose Maurice on the fixed gear side of the flip flop hub, however I’m having some slippage problems. Basically if I leg brake hard enough the pedals will rotate independantly of the wheel before reaching a point where it tightens up and the wheel/chain wheel is in lock step again. Likewise, the same thing happens with significant downward pedal pressure when taking off at lights or going up hill.
This is starting to become an issue because my back/knees get thrown out when I expect resistance but the pedals suddenly whip around. Is there anything I can do to fix this myself, or do I need to take it to my LBS?
Sounds like a loose cog, I’d stop riding it fixed or risk threading and wrecking your hub.
Sometimes with cheap stamped cogs, the width of the threaded section isn’t wide as the threads on your hub. This means that
a) no matter how tight you screw it on, it will still unwind alittle before hitting the lock ring, and
b) no matter how tight your lock ring is, it doesn’t butt up against the cog, so never locks the cog tight.
Same happened with my OTS bike, swapped out to dura ace cog & ring, tight as a nuns nasty ever since. Or put a skinny spacer between the cog and lockring. Either way, I’d definitely inspect your threads for damage first. Tighen, ride, repeat.
Hey, I had the same problem. My cog was slipping because it was not tightened correctly before the lock ring was put on. So it was able to rotate slightly between the hub and lock ring if enough pressure was placed on it.
Take off the cog and lock ring, inspect the threads. If they look OK then put the cog back on nice and tight and then the lock ring. I have a cheap hub and it didn’t do any real damage. I was probably lucky though.
i have a set off wheels off a maurice and the same thing was happening ,a tiny bit of slip one way and then the other…annoying. Replaced cog and lock ring 9With a surly like my other fixie) and presto shit is tight ,spent a little bit of cash and save the whole wheel. thid is not a shameless plug for surly but once i bought my first cog abd lock ring from those dudes i will always spend that bit of extra cash.
Yeah I rescued an otherwise dead hub with a surly lockring. I was pulling a skid wen I spat a cheaper lockring off the hub destroying it, and taking some thread off the hub at the same time. Even with a slightly damaged thread the Surly is keeping things tight though. Get one!!!
I had the same thing when I first started riding fixed.
It may sounds like a stupid question but did you install the cog yourself, and if so you did use a chain whip to tighten the cog and a lockring wrench for the lockring? Someone is welcome to prove me wrong on this but as far as I know you’ll never get it on tight enough without these tools. That was my problem. Hope this helps
Thanks for all the tips, folks. I haven’t accumulated enough tools to take off the lock ring / cog myself, so I’ve opted for the LBS option just to stay on the safe side. We’ll see what they can find…hopefully not a damaged hub thread!
