Surly Cog - 9speed or BMX chain?

m00nd0g
m00nd0g Posts: 176
edited November 2012 in MTB workshop & tech
Hi
I have just bought a Surly cog.
Surly say it is compatible with a 9speed chain.

What is better?
A) 9speed chain and Surly cog
B) BMX Chain and Surly cog

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