BMW's unfaired boxer twin, the R1150 R is a sophisticated response to the continuously expanding retro market and a reactionary demand for the return to minimalism. Unhampered by the bulk of a fairing or integrated bodywork, the R1150 R is a boxer with plenty of muscle and no little fleetness of foot. Its minimalism is only an illusion though. The visually appealing R has more advanced features than other machines of the same genre.

Described by one magazine as "the motorcycle industry's best kept secret", the £6,995 R1150 R continues the trend set by a new generation of BMWs for outstanding stability and definitive aerodynamics. Allied to a supremely comfortable riding position, the new R has a low centre of gravity and is an effortless motorcycle to ride.

The machine is conclusive proof that a return to basics doesn't have to mean a lack of enjoyment, practicality or sophistication. The most distinctive motorcycle engine of all time has just got better. The air and oil cooled 1130cc flat-twin, four valves per cylinder engine has gained a five bhp power increase (compared to its predecessor) raising it to 85 bhp. This translates into better acceleration right across the engine's speed range and more useable torque at lower revolutions. In fact, 90Nm (66 lb/ft) is consistently available between 3,000 and 6,500 rpm.

Two oil coolers are incorporated into the air ducts in the side tank covers and the warm air inevitably produced is channelled past the rider. The covers also provide a degree of wind protection while enhancing the R1150 R's overall aerodynamic performance. When riding it is sometimes difficult to believe that the machine is naked and open to the elements.

BMW has further improved exhaust emission quality and complied with the EU2 regualtions, by introducing dual-ignition to its 2003 range of boxer-engine machines. The effect of a dual ignition system is to improve the uniformity of combustion throughout the engine's operating range. Dual ignition represents a solution to the fundamental conflict between the need for the lowest possible emission of pollutants and smooth running - particularly evident in large capacity engines. As a bonus, the effciency of the boxer engines has been further increased, with a slight reduction in fuel consumption. Engine power output peak values and torque remain the same for all models.

Efficient distribution of the power increase can be attributed to the MA 2.4 Motronic digital engine management - already a proven system on other BMWs in the current range. To also help protect the environment the R1150 R has exhaust emission control - via a closed loop, three-way catalytic converter - fitted as standard.

For efficient transmission of the engine's power to the road, the R employs a new six-speed gearbox with a light, precision shift action. To emphasise the R1150 R's sports roadster character, sixth gear is geared "low". However, as an optional extra to improve fuel economy and make touring more comfortable, an alternative "overdrive" top gear can be ordered. This means that owners can configure the machine to suit their riding style - whether sports or touring.

A standard feature on all BMW flat-twin motorcycles is the low maintenance shaft drive. The unit is particularly reliable and long lasting, and employs a back-to-front crankshaft layout that enables the power to reach the rear wheel with no losses caused by changes of direction. BMW has retained the proven concept of using the load bearing engine and transmission unit and connecting them to the front and rear frames. The Paralever swing arm has been adopted from the R1150 GS and although the swing arm is now 14mm (0.55") shorter, wheelbase and steering geometry remain unchanged.