Rotor Uno Road Rim Brake Groupset

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Product Description

Direct and precise shifting, smooth activation, options for both rim and disc brakes, and low "ride" weight were fundamental when developing UNO, which merged the most-desirable characteristics of both electronic and mechanical systems to forge a new category of groupset technology. Hydraulic technology had already been implemented in the areas of brake and suspension systems; UNO applied that same technology to actuate shifting.
Uno Rim Brake

Break away from the rest with ROTOR's hydraulic actuated groupset: UNO.
Exclusive, lightweight, low maintenance, and technologically distinct, UNO merged the most-desirable characteristics of both electronic and mechanical systems to forge a new category of groupset technology. By partnering with Magura to produce UNO's rim brake system, you get the benefit of more than a century's-worth of expertise in hydraulic brake systems. Magura's RT8 rim brakes feature more precise braking control thanks to hydraulics, a quick release for fast wheel changes, and frictionless, dirt resistant design and technology for easy maintenance.
Uno Cassette

ROTOR expertise in drive train design is applied to the UNO cassette, resulting in a superlight and precise piece of art. The hollow design from high strength steel combined with 7075 heat treated alloy provides a stiff structure while keeps weigth as low as possible. Gear steps are designed to always fit your perfect cadence.
Surface coating reduces friction and increase durability. It is the perfect cassette to combine with ROTOR UNO groupset but it is also compatible with other 11s groupsets, and those freehub bodies using Shimano/SRAM pattern.
Uno Chain

ROTOR partnered with KMC to provide a chain designed to be durable, easy to maintain, and 100% compatible with UNO. KMC´s proven technologies complement UNO´s pedigree and feature Bridge: X shaped bridge plates allowing for more quick shifting; Quick Link for easy maintenance and installation; and DLC coating for longer lasting performance and smoother shifting.

Key Features:

  • Total weight = 1655 g, which includes shifters, front and rear derailleur, filled, uncut hoses, rim brake calipers and installation hardware, chain and cassette; designed for any ROTOR crank either with/without power meter (crankset is not included)
  • 11-28T UNO cassette included.
  • 118-link UNO chain included.
  • Includes complete bleed kits for both shifting and braking.
  • Compatible with standard single bolt, frame/fork brake mount.
  • Same mineral oil used for both shifting and braking.
  • Compatible with all ROTOR cranksets, oval Q-Rings, and round rings

  • 135 g (11-28T)
  • 11 speed
  • Gear ratio: 11,12,13,14,15,16,17,19,21,24,28
  • Material: high strength steel and 7075 heat treated aluminium
  • Recommended group: ROTOR UNO
  • Recommended chain: ROTOR/KMC UNO
  • Compatible with Shimano/SRAM freehub bodies.
  • Compatible with Shimano, SRAM and Campagnolo 11s groupsets

  • 1/2" X 11/128"
  • Pin Length: 5.65 mm
  • 118 Links
  • DLC coated black with red pins
  • 11 speed compatible

Occasionally, without notice, manufacturers change product design and/or specifications.

What Is A Groupset?


What Is A Groupset?


The groupset is all the parts that make up the drivetrain and brakes of a bike, transferring power from your legs to the rear wheel to moving you along and slowing you down. They vary significantly with discipline, with road and mountain bikes requiring different things from the groupset. Pricing can vary enormously and expectedly reflects the performance gains. The greater the price, the more features, lighter weight and better materials.

Road groupsets and mountain bike groupsets have significant differences, catering to their riding styles, with strength, weight and gear ratios varying in importance between the two. The three big drivetrain manufacturers found on the majority of bikes are Shimano, SRAM and Campagnolo.



Also referred to as the crankset, the chainset consists of two crank arms combined with one, two or three chainrings, depending on the application. Some chainsets are just the crank arms with the axle being a part of the bottom bracket (see below), whereas others have the axle fixed to the driveside arm. Pedals are attached to the ends of the crank arms.

Location of Chainset on a bike Image of Chainset and location on the bike


Bottom Bracket

The bottom bracket is what connects the chainset to the bicycle. It sits inside the frame and includes bearings allowing the chainset to spin freely. Some bottom brackets include the axle (as pictured), which the chainset connects to. Other bottom brackets are bearings only, with a hole in which the axle of the chainset fits into. There are threaded bottom brackets and pressfit options.

Location of Bottom Bracket on a bike Image of Bottom Bracket and location on the bike



The stoppers. The vast majority or mountain bikes have disc brakes. They have a caliper that grabs onto a rotor, which is attached to the centre of the wheels. Many road bikes have disc brakes but most still have rim or caliper brakes that squeeze the top of the rim. Rim brakes use cables to pull the arms together to squeeze the rim of the wheels.

Location of Brakes on a bike Brake from a groupset on a Bike


Brake Levers

Brake levers are what activate the brakes. Road bike brake levers double as the shifters. They have multiple movements to shift and brake separately. Mountain bike brake levers only actuate the brakes. Both mountain and road brakes can either use a cable or hydraulic fluid to activate the brakes.

Location of Brake Levers on a bike Brake Levers from a Groupset



The shifters use a cable that connects to the derailleurs (see below) to change the gears. Most mountain bikes bikes use trigger shifters attached to the handlebar to do this. Road bikes combine the brake lever and shifter into one unit. The left shifter will change the front derailleur and the right will change the rear derailleur. Electronic shifting can be found on very high end bikes too.

location of Shifters on a bike Shifters from a Groupset



Also known as ‘mechs’, the derailleurs are used in conjunction with the shifters to change the gears. There are often two derailleurs, one in the front and one in the rear. The front derailleur changes the front gears (or chainrings) while the rear derailleur changes the rear gears on the cassette. Front derailleurs are becoming less common on mountain bikes.

Image of a Derailleurs location on a bike Mech / derailleur from a groupset



The chain is what drives the bike. It connects the chainset to the cassette, going through the derailleurs to move the bike. Chain are specific to how many speeds are in the drivetrain. So, an 11 speed chain will only work with an 11 speed cassette etc.

location of a chain on a bike from a groupset Picture of a chain from a groupset



The cassette is the cluster of gears or sprockets on the rear wheel. It has teeth of varying numbers to set the different ratios of difficulties of the gears. The number of gears range from 6-12. Rear derailleurs are used to move the chain up and down the cassette to change the gears, and are actuated by the shifters. The bigger the sprocket, the easier it is to pedal, while the smaller the sprocket, the harder it is.

location on a bike of a cassette from a groupset Picture of a cassette from a groupset


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