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The 2015 BMW R 1200 GS receives more gyrating mass for a more smooth-running performance.

More gyrating mass for the standard R 1200 GS

Written by Thomas Schmieder
The GS' produced in 2015 features a minor model upgrade. This includes, in particular, the increased gyrating mass, as could be found rotating in the Adventure and RT right from the start. Credit: Bilski

The standard version of the BMW R 1200 GS now also receives more gyrating mass, with a view to improved smooth-running. So just like the Adventure and all other water-cooled boxer models were from the beginning. Add to this a few new equipment options, and that’s the optimisation for the 2015 release.

A perfect, picturesque autumn day. Outside the morning sun is tearing through the fog. A polished, clear sky shines bright. There’s nothing like being outdoors! With the BMW R 1200 GS, which has been slightly polished up for 2015. Hold on a minute, there’s two of them parking there. Top tester Karsten Schwers also wants to join in – he has the 2014 model. Hmmm, and which one is the new one? The approval king’s new clothes: the new paint variant is a deeper, dark black rather than the previous anthracite. The most obvious differentiating feature is the new key. With the Keyless Ride equipment option it is really big, like a car key.

All you have to do is have the key on you to release the steering lock. The centrally positioned switch above the steering head switches the ignition on. Only the 2014 model has a classic ignition lock with a small key. Both boxers respond to a press on the start button with a promising roar, then fall into an even, hollow-sounding idle state. A wake-up call for the competition? Since the change of cooling concept for the 2013 season, more than 55,000 of the completely revolutionised BMW R 1200 GS’ have rolled off the Berlin production lines. Added to this are the more than 16,000 BMW R 1200 GS Adventures in 2014. This makes more than 70,000 water-cooled GS’. The colossal GS Adventure is now available lowered, on request.

This is what gives the BMW R 1200 GS for 2015 its generally larger gyrating mass. The central crank arm in particular has, on the whole, become thicker and larger in diameter. In addition to this there is a new, more solid gear wheel of the primary drive system with fewer recesses and holes. There are now a total of 8,166 grams rotating deep in the stomach of the engine compartment, rather than the previous 7,039. Is this noticeable? Well yes, by sensitive types most of all. The torque reaction of the longitudinal crankshaft, rotating transversely to the driving direction, feels a little too strong in both GS models: give it some gas when stationary and the 1200 series bikes first swing to the right, then roll left back into the starting position.

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