Rotor readily pokes fun at itself in regards to the new Uno road groupset, rightfully calling it “one of the worst kept secrets in cycling.†That the group was in development may not have been in question but how exactly it works has been anything but clear – until now. We sat down with Rotor engineering manager David Martinez and got the full scoop on Uno’s oil-filled guts.
Martinez says that Uno will be “the lightest complete disc brake road groupset†when it eventually hits the market in spring 2016. Much of the weight savings comes from the use of lightweight aluminium alloys and liberal helpings of carbon fiber but it’s the hydraulic actuation system that ultimately puts it over the top. Rotor has yet to quote exact figures – either for pricing or weight – but low-pressure hydraulic line and oil is certainly lighter than equivalent lengths of steel cable and housing.
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The indexing mechanisms are located in the derailleurs, not the levers
Unlike Acros’ A-GE mountain bike transmission – which uses two hydraulic lines per derailleur – the Rotor Uno setup uses just one. Each serves the same function as the cable does in a conventional transmission, moving the derailleur cage inward out back and outward up front. Strong mechanical springs handle the return motion.
Whereas conventional transmissions house the gear indexing functions in the levers, however, Uno relocates them to the derailleurs using a system called HyStep. The mechanism – at least for the rear – is somewhat similar to a geared ratchet wheel (or wristwatch internals) with discrete positions for each cog. Adjustment is apparently brutally easy, too: just set the derailleur’s adjustment ‘window’ to match up with the cassette sprocket positions, and then lock the assembly in place.
You can read more at BikeRadar.com
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