BMW uses a three segment nomenclature for motorcycles. The first segment indicates the engine type, the second indicates the approximate engine displacement in cubic centimeters (with one notable exception – the F 650 GS, which has an engine displacement of 798cc), while the third indicates the class of motorcycle (e.g., sport, sport touring, dual-sport, etc.). The three segments are separated by blanks.
A similar 3 segment nomenclature is used for BMW automobiles. However, there is significantly less consistency across the range with respect to the second segment (engine displacement/100).
Engine displacement in cc
Styling suffix designations:
Additionally, a bike may have the following modifiers in its name:
Examples: K 1200 S, R 1200 RT, F 650 GS, R 1150 RSL, K 1200 LT, K 1200 LT-C, R 1200 RT-P, R 1200 RSA, S 1000 RR
Prior to the introduction of the K 100 series and the R 1100 series motorcycles, the letter prefix was always the same, and the numbers were either based on displacement, as mentioned above, or were just model numbers.