Norton Manx Magnesium 6 Speed Gearbox

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We are excited to offer a light weight 6 Speed Magnesium Gearbox for the Norton Manx racers. For the past 10 years, we have used the TTI gearbox in our Manx racers without a single failure!! All of the TTI gearboxes are manufactured in New Zealand. Bruce and the TTI team use a modern drum selector mechanism for a positive change with reduced pedal travel, stronger shafts & bigger bearings. This is the latest LW55 6 speed magnesium gearboxes that we use in our own race bikes. We consider them the optimum for up to around 75 BHP, 50 FT LB. Beyond that you should consider the HD variants. The LW55 is not available with a kickstart. As a Manx racer, the Manx mainshaft length is only available in the magnesium shell. See the drawing.

There is also an option for lever direction. Do understand that your actual pedal or linkage may be quite different from the drawing. These gearboxes are built to your specifications. Manx: 22mm of clutch spline plus 15mm of thread versus the Commando: 25mm of clutch spline plus 15mm thread. TTI gearboxes use different final drive sprockets from other gearboxes & we supply each `box with one 520 (5/8" x 1/4") sprocket. The internal Ratios are: 1st - 2.298:1, 2nd - 1.780, 3rd - 1.470, 4th - 1.260, 5th - 1.103, and 6th - 1.000.

We do ship internationally and share our deep discounts with all of the major shipping services.