gearing parts


Im running 37/22 now with 70 chain(which is what the manual states)but there is a lot of bend in the chain. I was thinking of the 68 to get rid of the bend. Also, the chart has an X in the 37/21 pairing which is also what I wanted to run. My buddy runs that pairing. I don't understand why certain gear pairings are 'X' ed out.
 
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