Just ordered a few parts from work HH brakepads, renthal bars and a 14 tooths front sprocket.

1, do i need to break the chain to fit the new front sprocket?
2, do renthal bars (specifically the low braced enduro ones) have the small holes drilled for the switch gear ass'y? if not is it better to drill the holes or file off the little bits that would go in?

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...On a steel horse i ride.