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[Doctorbass]

Here is a little drive system ratio summary of all S and DS for the  2011 and 2013 Zero

Doc

[zlagger]

This will be useful in the future... Thanks Doc

Here is a little drive system ratio summary of all S and DS for the  2011 and 2013 Zero

Doc

[trikester]

Right of the top of my head I can add that the 2013 FX chain drive is 12 to 65 = 5.417 ratio.

Trikester

[protomech]

Standard FX is 25 to 132 belt = 5.28 ratio

The 2013 S and DS bikes also have a 25 tooth front sprocket option. This can be combined with a 98 tooth rear sprocket, so there's some degree of flexibility with sprocket sizes.