EB14: Saris Powertap Adds Disc Hub, Plus New Complete Alloy Wheels and a Look at Past Prototypes (Updated)
Last year, Wheelbuilder.com introduced a titanium XD Driver Body for the Powertap Mountain Bike hub, which was something they helped develop. The issue was decoupling the braking forces from the drive forces to get an accurate power reading and not mess up the strain gauges.
What’s new is that the G3-based disc brake Powertap hubs are now available in either 24 or 28 spoke drillings, down from the original 32-hole MTB versions. They recommend 24 count for road and cross, and 28 count for mountain bike builds.
UPDATED: More tech and weight info added for new disc brake hub below, plus specs for DT Swiss rim wheels.
The disc brake rotor is proprietary, necessary to mount a disc where their electronics typically sit. They say heat from the rotor won’t affect the power reading since the strain gauges are totally isolated from the outside hub shell. READ MORE ->