Viking Roma xxr

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So if I change them will I have to change the shifters then ????

no. The length of the rear deraileur cage limits the no of rear teeth you can goto on the cassette. Changing the 42 to a 39 will depend if your front chainrings are seperate and can be split.
 

Cycleops

Legendary Member
Location
Accra, Ghana
They should both be OK.
 
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