Power to stop.
Training and racing with power, even in the dirt, leaves our faces glued to our computers and constantly pushing to maintain wattage outputs. However, we all have to stop some time. And if you're running a PowerTap G3 mountain bike hub, you'll need a PowerTap MTB Replacement Disc Rotor at some point. It's been built around PowerTap's proprietary eight-hole disc rotor interface, so it's not compatible with standard disc hubs. Which, in turn, also means that no other rotor is compatible with the G3 MTB. In other words, we're saying that it's wise to keep one in your spare parts collection or race-day mechanic's kit.
The PowerTap MTB Disc Brake Replacement Rotor is available in a 160mm size and is only compatible with the PowerTap G3 MTB Disc Hub.