The New Rotwild R.X275
The Athlete With An Intuitive Boost
Head to the bottom of this article to read our First Ride review
Neither bio-bike nor eMTB: with the R.X275, the Hessian bike manufacturer ROTWILD establishes a new category of riding a bicycle. It is not for nothing that the company confidently calls it a “trail bike with eAssist”. The focus is on the rider’s sporting ambition, the individual energy resources and the intention to use them on the trail. The R.X275 provides subtle support without imposing itself or demanding control. The rider unleashes additional power through the Boost Button, an innovative new development by the company.
With the R.X275, ROTWILD combines a unique riding experience with innovative technology and a fundamentally new riding approach. “Its linchpin is the principle of the Boost Button developed by us”, explains ROTWILD Managing Director Peter Schlitt. It is a ring that is harmoniously integrated into the newly designed cockpit, which the rider can use to release an extra portion of thrust. “The focus of the R.X275 is clearly on the rider’s own rhythm. He or she is the driving force. The motor provides constant and subtle support,” emphasizes Peter Schlitt. “For those moments on the trail when thrust and support are required, the rider releases extra energy completely intuitively via the Boost Button. Just like he operates the bike shifter and seat post.” For a maximum of 30 seconds and as long as the button is pressed, up to twice the rider’s own power is available, up to a maximum of 300 watts. “Our target group are athletes who follow an individual training plan and whose focus is on permanently increasing their own performance,” says Peter Schlitt. “That’s why we call the R.X275 “the athlete”. Our approach in the development was to create a very light trail bike with eAssist. The design with the Boost Button allows us to find just the right balance between biological power and support. We reduced everything to get the maximum riding experience out of it,” Peter Schlitt proudly emphasizes.
eAssist symbiosis with 250 watt hours and technology by TQ
The power of the R.X275 is in the Integrated Power Unit, the IPU275. It consists of the battery developed by ROTWILD itself, which effectively delivers 250 watt hours. The energy storage unit is made of state of the art type 21700 cells and is firmly integrated into the down tube. “The motor control software specially programmed by us regulates the energy management. It ensures optimal interaction of battery and drive unit,” says Johannes Matschos, product manager at ROTWILD. The motor used is TQ’s HPR50 with a maximum torque of 50 Nm. “We decided to cooperate with TQ on this concept because we see this as the optimal tool to combine our approach of lightness with efficient power assistance,” explains Johannes Matschos. The TQ motor provides support with three riding profiles. “Changing modes while riding is not the style the rider uses to move the R.X275. You do that once via the display before you start. We have integrated that into the top tube. Additional support comes via the Boost Button,” says Johannes Matschos. Users can customize the individual profiles via the TQ app.
Frame and kinematics underline the bike´s lightness
Everything in the R.X275 is trimmed for lightness. “We looked at many parts to see how we could save weight and then adapted the design accordingly,” says Johannes Matschos. In the Ultra version and size M, the bike has a total weight of 15.6 kg. One of the decisive factors for the light weight is the frame. It weighs 2,350 g in size M. It is made entirely of high-modulus carbon fiber and is handmade. The handlebar is also made of carbon fiber. In the Ultra version, the handlebars and stem are fused into a fully integrated cockpit.
This consistency in lightweight construction is continued in the rear triangle. There, flexing seatstays made of carbon are used. ROTWILD does not use any additional bearings to save weight. The Short Travel kinematics with 130 mm travel at the front and 120 mm at the rear ensure agile handling and strong grip. The 437 mm long chainstays underline the compactness of the rear triangle. In addition, the R.X275 rolls on 29″ wheels. For the first time, the manufacturer also installs a universal UDH derailleur hanger. The frame also features two bottle mounts: for water bottles or a range extender.
The R.X275 is available in Pro (9.499 EUR) and Ultra (12.499 EUR) versions and comes in four frame sizes (S, M, L and XL).
Learn more about the Rotwild R.X275 on their website here.