The GPM GM237SAA main drive shafts combine steel sections with 6061 T aluminium to provide a targeted reduction in rotating mass while maintaining required strength. Front shafts adjust from 122mm to 132mm and rear shafts from 105mm to 115mm, enabling accurate drivetrain geometry adjustments. A steel wire ring secures the mounting screws to reduce the risk of fastener loosening under load, supporting reliable operation during demanding running conditions. The aluminium segments reduce inertia versus all steel shafts, aiding drivetrain efficiency without sacrificing durability.