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Discussion Starter · #1 ·
I've got a strange problem with my month-old Redline Monocog.

I was lubing the chain, checking tension, doing all that sort of thing in the garage last night and I noticed something strange that I can't pinpoint or fix.

My chain tension is really inconsistent, meaning that at certain crank arm positions it's tighter than when the cranks are turned another 1/4 rotation. :confused:

I tried to make all the small adjustments, checked the hub/wheel to make sure it was properly aligned with the frame, etc. and couldn't fix it.

Any ideas?

I'm thinking that either the cranks/BB are not installed correctly, or that the chain ring is lopsided, but that really doesn't seem likely.

:confused:
 

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chainring

Beckman4 said:
I'm thinking that either the cranks/BB are not installed correctly, or that the chain ring is lopsided, but that really doesn't seem likely.

:confused:
You got it. I'll bet your chainring is not completely round. Search around on Sheldon's site and he gives tips on how to adjust your chainring on your crank/spider to compensate for this.
 

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Beckman4 said:
I've got a strange problem with my month-old Redline Monocog.

I was lubing the chain, checking tension, doing all that sort of thing in the garage last night and I noticed something strange that I can't pinpoint or fix.

My chain tension is really inconsistent, meaning that at certain crank arm positions it's tighter than when the cranks are turned another 1/4 rotation. :confused:

I tried to make all the small adjustments, checked the hub/wheel to make sure it was properly aligned with the frame, etc. and couldn't fix it.

Any ideas?

I'm thinking that either the cranks/BB are not installed correctly, or that the chain ring is lopsided, but that really doesn't seem likely.

:confused:
I bet the chainring is slightly out-of-round.
 

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no problem really

It's your chainring. I often have the same problem as doo most of us. When the chainring is tightened there is a slight off-center of the ring on the spider which causes the chain to tighten then loosen as the cranks are turned. It really isn't a big deal and quit impossible to get centered. You can try if you want, but the worst thing to happen is you might have to change the ring once a year instead of every two years...
 

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Discussion Starter · #5 ·
Thanks!

For the responses!

Seemed really weird to me, but now that I know it's fairly common and not a problem, I feel much better!

Thanks guys
 

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Happens to the best of us!

Most spiders allow for a bit of "play" to adjust the chainring position (again, see Sheldon's site for the details), and most chainrings aren't perfectly round. A slightly bent BB spindle can also cause this to happen: I have the same crank and ring on my new Vulture that I had on my KM (whose BB was several years old and in its third frame), and chain tension is definitely more consistent on the Vulture.

If you run SS-specific rings and cogs with tall, non-ramped teeth, and especially if you use an 8-speed chain, you'll be amazed how much slack you can get away with and not drop the chain.
 

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Beckman4 said:
I've got a strange problem with my month-old Redline Monocog.

I was lubing the chain, checking tension, doing all that sort of thing in the garage last night and I noticed something strange that I can't pinpoint or fix.

My chain tension is really inconsistent, meaning that at certain crank arm positions it's tighter than when the cranks are turned another 1/4 rotation. :confused:

I tried to make all the small adjustments, checked the hub/wheel to make sure it was properly aligned with the frame, etc. and couldn't fix it.

Any ideas?

I'm thinking that either the cranks/BB are not installed correctly, or that the chain ring is lopsided, but that really doesn't seem likely.

:confused:
Reposition the chainring on the spider, take it off and rotate it 90 degrees if 4 bolt, 72 degrees if 5 bolt. You might do better.
 

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Also consider that your chainwheel may be perfectly round, but the holes on your spider may be slightly off-centre
 
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