Thread: Hollowtech 46/34 to GRX 46/30? Shimano 68mm BB
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Old 05-31-20, 03:34 PM
  #10  
wsteve464
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It would probably be cheaper to look into an 11/42 cassette and a link for the rear derailleur.


https://www.bikecalc.com/gear_ratios to help you determine if a new cassette will provide lower gearing than a 30 tooth chainring
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