BMW R 1100 RT Repair Manual page 259

Technical Data
Steering lock angle
Steering head tube dia.
Handlebar width with weights
R 850 GS
° 2 x 42
mm (in) 22 (0.866)
mm (in) 890 (35.0397)
R 1100 GS
2 x 42
22 (0.866)
890 (35.0397)
32.5