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@hugo7
There are two types of chain.
1/8 and 3/32.
1/8 is the standard track size and 3/32 is road.
I have no idea why they would sell a bike with 3/32 on one side and 1/8 on the other, it's retarded. Does your old/original chain fit around both sides of the fixed cog.
You can use a 1/8 chain with 3/32 cogs but not the other way around.