Cog slipping?
- scrubnbash
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Cog slipping?
Postby scrubnbash » Wed May 18, 2011 9:32 am
- skull
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Re: Cog slipping?
Postby skull » Wed May 18, 2011 10:06 am
I like to think it was because I am too powerful, lucky I had made it into town and only had to walk a couple hundred metres.
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Re: Cog slipping?
Postby beachbum » Wed May 18, 2011 10:09 am
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Re: Cog slipping?
Postby familyguy » Wed May 18, 2011 10:20 am
Does the fixed cog still spin if you twist it with your fingers??
Jim
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Re: Cog slipping?
Postby scrubnbash » Wed May 18, 2011 10:25 am
Fixed cog isn't going anywhere with my fingers, it's real tight. The lockring on the other hand...
Hope I haven't stripped it, just got a new 15t cog I was planning on putting on there. That and the control of speed is pretty addictive.
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Re: Cog slipping?
Postby familyguy » Wed May 18, 2011 10:39 am
What might have happened:
Lockring became loose somehow
As you slowed, fixed cog unwound to meet lockring, and you might not have noticed
As you pedalled, fixed cog tightened, sending you off
Fixed cog is now tight, but lockring remains loose
Check the threads, if they're ok, tighten the lockring properly, go riding.
Jim
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Re: Cog slipping?
Postby rustychisel » Wed May 18, 2011 11:03 am
It's worth whipping the wheel and cog off and taking a good look at it, checking threads etc for obvious damage. Cheap cogs are cheap cogs, unfortunately, and they will rip the threads when given a chance. Grease yer threads. Tighen up, tighten lockring, ride a bit then re-tighten.
- scrubnbash
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Re: Cog slipping?
Postby scrubnbash » Wed May 18, 2011 2:31 pm
This could end up being fortuitous, seeing as I have a new, I assume better quality (roselli?), cog to put on there.
...Just hope the threads aren't damaged .
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Re: Cog slipping?
Postby familyguy » Wed May 18, 2011 3:44 pm
Should work, thats what I use.scrubnbash wrote:Thanks a bunch guys! Can I tighten the lockring up sufficiently with a C spanner or am I looking for a different tool?
This could end up being fortuitous, seeing as I have a new, I assume better quality (roselli?), cog to put on there.
...Just hope the threads aren't damaged .
Jim
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Re: Cog slipping?
Postby Moe » Wed May 18, 2011 4:34 pm
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Re: Cog slipping?
Postby slidetaker » Fri May 20, 2011 2:06 pm
1. Ensure the cog is absolutely tighened before installing the lockring. This can be done by riding some steep hill. At this time, no reverse peddle. Don't care how you get back downhill, use brake or walking.....
2. Grease the threads
3. Get good quality lockring with generous amount of width. The Surly lockring is 5.5mm wide, which I think is adequate. More threads engagement, less force per length of threads and less likeihood of slipping/stripping.
4. Do some short rides and retighten lockrings at least 2 times before any abuse..
- scrubnbash
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Re: Cog slipping?
Postby scrubnbash » Sat Jun 04, 2011 4:29 pm
Got the cog off with some gumption and that rota fixed method. It wasn't obvious that any grease had been used in putting it on. Threads were fine and dandy. Tossed the 16t and put on a better 15t, used the rota fixed thingo again going in the opposite direction, tightened the lockring RIGHT up (all with a healthy dose of grease). Took it for a forward-pressure-only ride just then, going up some steepish hills near me and nothing has moved yet (I'm running a higher gear now and up out of the saddle everything felt solid). Tentative success! I'll ride it around for a couple of weeks being careful not to use any back pressure, re-check everything and then I reckon I'll feel confident with it again.
Thanks for your help everyone.
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Re: Cog slipping?
Postby Green » Thu Jul 14, 2011 11:25 pm
I just picked up a new masi fixed, the shop converted it from SS to FG for me but on the ride home I had some slipping, I just had a look at the lock ring and it was only finger tight. The fixed cog is still spinning okay so I imagine the lock ring just needs to be tightened up and then it will be all good?
There was also some creaking under load, would this have been caused by the loose lockring?
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Re: Cog slipping?
Postby slidetaker » Mon Jul 18, 2011 1:37 pm
Regardless of the creaking, you need to make sure the cog and lock ring is secure first...
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Re: Cog slipping?
Postby Green » Sat Aug 20, 2011 12:30 am
do i perhaps need a better/different ring?
cheers
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Re: Cog slipping?
Postby slidetaker » Wed Aug 24, 2011 4:47 pm
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