Here I have a 1/2" drive socket to fit the gearbox sprocket nut on the 4 speed triumphs ie T120 T110. It is 1- 11/16" ( 43mm ) across the flats. The nut is not included.
TRIUMPH 6T TR6 T120 BONNEVILLE PRE-UNIT/UNIT 650 4 SPEED GEARBOX BEARING 60-3556
TRIUMPH BONNEVILLE T120 TRIDENT T150 4 SPEED GEARBOX SPROCKET NUT S542 21-0542
TYchDK 4 Speed Gearbox Counter Main Shafts Fit for 190 Engine 190cc 4V Motor Dirt Bike Gear N-1-2-3-4
BSA A10 4 Speed Gearbox Sprocket Nut OEM: 67-3053
TRIUMPH 5 SPEED GEARBOX MAINSHAFT ASSEMBLY 57-7077 T120V TR6V T140 TR7
4 Speed High Gear Lock Tab Washer Gearbox Sprocket Triumph T120 T2116
