Spanish aluminum specialist, Rotor, have created a new freehub engagement system called the RVolver. This is the first hub under the Rotor namesake, but the engineering and manufacturing house EDR, that produced, and was recently acquired by Rotor, has been making motorcycle hubs for over 30 years.
There are only a handful of hub systems on the market, nearly all of them revolving around a spring and pawl system. DT Swiss's Star Ratchet system and the Spragg clutch system from Onyx are one of the few that stray from the norm. Rotor says the RVolver system is almost a mix of spring and pawl with a star ratchet. Using cylinders that are activated by springs to engage, the 'clutch' ratchet ring floats towards the freehub body under power, and almost completely disengages when not under power, causing less drag. This sliding action isn't produced by a spring or magnets, it is achieved by angling and rounding the connecting pieces at precise degrees.
Weight is saved constructing the hub from aluminum, with the only steel pieces being the ratchet ring, springs, and cylinders. The hub shell and freehub body don't wear with use, the steel ratchet ring can be replaced and the cylinders can be moved into the other five out of ten locations – basically, this hub should last forever.
Claimed weights are 112 grams front and 238 grams for a rear hub, Rotor compared this to the popular DT Swiss 240 hub set saying their product is lighter as well as using bigger bearings.
The road hubs have a 14º engagement, but Rotor are working on internals for the enduro hub that will have 5º pick-up. The MTB hubs will be available in boost widths only, with Shimano or SRAM XD drivers. Straight pull or j-bend spoke options with 28 or 32 holes. Everything is made in-house in Madrid, and a pair will cost around €500 when they are ready to ship this fall.
Rotor also claims to have the first dual-sided, integrated power meter crank for mountain bikes. Power meter cranks are one of the brands best sellers in the road market and are gaining traction in the MTB world. Most power cranks generate a reading for each side, but this is calculated by reading the positive and negative power from one side – the dual design should give more accurate readings from the four pairs of strain gauges. The cranks are Bluetooth and ANT+ compatible and in connection with Training Peaks, should help you to optimize your pedaling stroke in conjunction with Rotor's adjustable Q-Rings. Available this December for €1250.