Chain Chainring Cog size problems - London Fixed-gear and Single-speed

20thebear · 12th August 2008

I'm having problems with my chain / chainring / cog combo on a secondhand bike i have just bought. The chain does not sound of feel like it is running smoothly and feels as though it jumps sometimes.

I think I may have found the problem but can someone confirm this is it.

The chainring is a Blackspire DH ring. The website says "Compatible with 8/9 Speed chains". I have seen on the sjs cycles website that 8 speed is 3/32" chain.

The cog is a DMR freewheel conversion kit.
http://www.chainreactioncycles.com/M...x?ModelID=2300

I have been told these are for 3/32" MTB chains.

The chain fitted is a Sram PC1 which I believe are 1/18".

Is the problem due tot he 1/18" chain on 3/32" rings?

Thanks for any help.

adoubletap · 12th August 2008

Could be issues with your BB and chainset size but PC1 is the absolute cheapest/lowest quality chain out there in 1/8th. In theory a 1/8th chain on a 3/32 drivetrain would be quite forgiving alignment-wise.

bikepimp-rcyb · 30th August 2008

no its only the other way round that it dossent work your problem is probly excesive wear in chain or cogs or maby your chainline is out

Archi Pelago · 30th August 2008

Quote:

Originally Posted by bikepimp-rcyb

dossent
probly
excesive
maby

Grammar/Spelling police will be along shortly!

12th August 2008	#1
20thebear	Chain Chainring Cog size problems I'm having problems with my chain / chainring / cog combo on a secondhand bike i have just bought. The chain does not sound of feel like it is running smoothly and feels as though it jumps sometimes. I think I may have found the problem but can someone confirm this is it. The chainring is a Blackspire DH ring. The website says "Compatible with 8/9 Speed chains". I have seen on the sjs cycles website that 8 speed is 3/32" chain. The cog is a DMR freewheel conversion kit. http://www.chainreactioncycles.com/M...x?ModelID=2300 I have been told these are for 3/32" MTB chains. The chain fitted is a Sram PC1 which I believe are 1/18". Is the problem due tot he 1/18" chain on 3/32" rings? Thanks for any help.
	quote reply

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12th August 2008	#2
adoubletap	Could be issues with your BB and chainset size but PC1 is the absolute cheapest/lowest quality chain out there in 1/8th. In theory a 1/8th chain on a 3/32 drivetrain would be quite forgiving alignment-wise.
	quote reply

30th August 2008	#3
bikepimp-rcyb	no its only the other way round that it dossent work your problem is probly excesive wear in chain or cogs or maby your chainline is out
	quote reply

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