Horex VR6 Roadster Update - Feature

Horex is finalizing validation and homologation tests of its VR6 Roadster, the first model to go into production powered by the naturally aspirated edition of its 1218cc engine.

Official figures and a few more details about the construction of the Roadster have been announced. The engine has gone through final dyno tests to optimize power, fuel consumption and emissions. The compact, 15-degree VR6—three overhead cams per bank, three radial valves per cylinder, six throttle bodies and an 11.5:1 compression ratio—generates 161 horsepower at 9000 rpm, a good value, given the fat torque curve that delivers 66.4 foot-pounds of torque at just 2000 rpm, climbs to 73.8 ft.-lb. at 3500 rpm and surges to a 99.6-ft.-lb. peak at 7000 rpm.

These numbers promise smooth, strong power delivery through the six-speed gearbox and chain final drive (in place of the originally planned belt). The chain is lubricated by a special graphite guide block mounted atop the massive single-sided swingarm. The chain gently grinds against the graphite, which applies a film of dry lubricant to the rollers. This unique system is said to prolong the life of the chain and sprockets without flinging oil or grease onto the bike or its rear tire.

The twin-spar main frame, which is integrated with a steel-tube mini-trellis subframe that supports the steering head, spans a GT-bike-like 59.6 in. wheelbase. Steering geometry is more on the sporty side: 24 degrees of rake and 3.7 in. of trail. Both the WP 48mm male-slider fork and single shock are adjustable in compression, rebound and spring preload. The front brake system is based on Brembo’s well-known twin-320mm-rotor, four-piston, radial-mount-caliper setup. Bosch provides the related ABS.

Dry weight for the VR6 Roadster is said to be "about" 551 lb. Top speed will be electronically limited to 155 mph.