Speedo gearbox 2:1, 3/4″ hole

Triumph,BSA,AMC,Norton

Speedometer Gearbox 2:1. To fit AJS/Matchless heavyweight twins & singles (hole may require reaming). BSA C15/B25/B44, all years.
Norton Dominator & ES2.
Triumph 3TA/5TA, T100 1964-67, T120/TR6 1964-66.

For models fitted with Chronometric type speedo’s pre 1966.
Centre Hole size : 3/4″
Ratio 2:1
Smith’s No : BG5330/287