|The G650 range from BMW encompasses the X Challenge, X Country and X Moto. They all share the same platform but vary slightly. They have become something of a cult bike, becoming more popular since production ceased.
One of our favorite Motoradders Amy Harburg has our suspension in her G650X. She is a GS Girl; a member of the BMW Motorrad International GS Trophy Female Team, and has done extensive testing for us on her own G650X.
We will talk about all the G650 bikes as one, as they all share a similar platform. The X Country does come with 19/17 wheels and a 270mm travel fork, but it uses the same fork tubes as the X Challenge so all bikes can be made the same height.
|The 45mm Marzocchi forks come in a few variants for the models but are all very similar internally. Inside they are very cheaply manufactured, using a crimped steel cartridge that cannot be disassembled, and therefore cannot be rebuilt, modified or repaired. They are very similar to the units found on the F800GS, and need the same kind of modifications.|
The 650 X Challenge has an air shock which is OK for light riding to the shops to get some milk and a paper but not much else. It wallows, tops out and has been known to leak. We have tested the stock air shock in our spring tester over BMW's suggested pressure range, with the lowest reading being 70N and the highest 95N, and we tend to use shock springs in the 80 to 105N range (depending on rider weight and terrain/type of riding). The X Challenge has an air shock length of 342mm, and whenever we fit a replacement shock to a G650, it's the length we use because we feel its the best length for the chassis.
Air spring stock pressures, weights and conversions from BMW stock data to us testing the stock air shock at varying pressures.
The X Country's coil spring shock is a basic unit with ride height adjustment, giving between 330-338mm length.
We recommend an Ohlins BM636 as a coil spring replacement. We shorten this shock under normal circumstances to 342mm, same as the stock air shock.