Why manufacturers sell bikes with straight, hard to get to stems makes little sense at all. There are 90 degree stems on the market that have proved
Right Angle Replacement Motorcycle Tire Valve Stem – Sound RIDER! Store
Valve Extension Kits. Coast to Coast International
Tyre Valve 90° Stem Extension
90 degree Valve Stem Adapter for BMW K1200LT
90 degree valve stems on 1200GS cast wheels?
90 Degree Valve Stem - TPMS Adapters – BCFORGED
BMW K1200LT Motorcycle Parts & Accessories
2006 BMW K1200LT Exodus Parts & Accessories - RevZilla
Place on vehicle: Secure to edge with lock nut.
90 Degree CNC Motorcycle Valve Stems Tire 10mm Pair 11.3mm Rim Wheel Aluminum (Black)