BMW have unveiled updated versions of its best-selling tourer, the R 1200 RT, as well as the iconic Adventure Sports motorcycle, the R 1200 GS and its R 1200 GS Adventure, featuring a new version of the company's 4-valve, DOHC boxer engine.

BMW say the motor, only seen until now on the HP2 Sport, has been optimised to meet the specific requirements of each of these motorcycles, to best suit either the travel enduro riding style of the R 1200 GS range, or the all-day, luxury touring use of the R 1200 RT.

The new engine fitted to the RT is a 1,170cc, 4 valve, DOHC. BMW claim a maximum power ouput is 81kW (110hp) at 7,750rpm (up 5% for GS and Adventure) and an increase in torque from 115Nm to 120Nm (88 lb-ft) at 6,000rpm. Maximum engine speed is increased by 500rpm to 8,500rpm. BMW claim the new engine offers significantly improved torque, traction and acceleration, as well as a more spontaneous and direct throttle response. The new engines are also compliant to EURO 4 emission regulations.

In addition to the brand new engine, the R 1200 RT has received integral ABS fitted as standard, a new Electronic Suspension Adjustment (ESA II), optional new audio system with Multi-Controller interface for USB/MP3 and iPod, new design fairing to offer improved wind and weather protection, a re-designed cockpit and an electronically controlled windshield.

R 1200 GS and Adventure new features:

· Newly designed cylinder head covers

· Improved windshield adjustment

· New colours

· New and revised special accessories, including additional LED headlamps, Akrapovic sports silencer and carbon heat shield

The prices for the new R 1200 RT, R 1200 GS and R 1200 GS Adventure will be announced on Press Day, 26 November, at the International Motorcycle Show, NEC, Birmingham.