Chain Chainring Cog size problems

Posted on Tue 12th, August 2008

• #1

20thebear

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/Models.aspx?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.
• #2

dubtap

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.
• #3

Toon_phycle_pimp

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
• #4

Archi_Pelago

dossent
probly
excesive
maby

Grammar/Spelling police will be along shortly!

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