A number of people with modern bikes have been hesitant to add a torque sensing bottom bracket to their ebikes because it meant changing over their cranksets to a square taper model as well.

Torque Sensing BB with ISIS Spindle

Well, at least there is one choice for a splined interface. The company NCTE has produced a torque sensor that has the same electrical specifications as the THUN devices, but which uses an ISIS spindle. We've got a 128mm spindle length model in stock for those with ISIS cranks keen to try it out.