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You CAN replace the chain rings. But buying new crank arm/chainrings with a new bottom bracket would be quicker & easier.
He might want to invest in a whole new group set, say something like Shimano 105.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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