best chain for 10 speed

5x2 or 10x1?

If it's the former on friction, a 9 speed chain. Fits over the cogs fine but the narrowness means there's less need to trim.
 
Are you after genuine vintage? Then Regina, DID, wippermann, Everest would fit the bill.

Shaun
 
Re:

Any of the KMC 10 speed chains if you mean modern 10 speed cassettes
 
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