Wired SRM crank arm/length change. Simply change out arms?

How easy is it to change out SRM arm lengths on a wired (older) SRM? Do you simply unscrew the arms? Friend needs a (edit/correction) 172.5mm and the SRM has 170s. Thanks

How easy is it to change out SRM arm lengths on a wired (older) SRM? Do you simply unscrew the arms? Friend needs a 175mm and the SRM is 170s. Thanks

Yup. You will need to recalibrate the unit after swapping arms. But the actual change is easy. What you need - tool-wise - depends on the unit (I think); but I believe it’s all Torx bolts.