DESCRIPTION

Forget every Norton gearbox that you have used in the past, the TTI gearboxes are on a different level. Manufactured in New Zealand by our friend Bruce Verdon`s company (Bruce has had a couple of our bikes), we have been using & selling these gearboxes for over 10 years now, and the next failure wil be the first. They use a modern drum selector mechanism for a positive change with reduced pedal travel, stronger shafts & bigger bearings.

These TTI Laid Down gearboxes are an exact replica of the Manx pre 1957 "Laid Down" box, developed by TTI in conjunction with TGA @ MPL, as used in Manx Nortons but with modernised internals. The only deviation from original is that the gearchange shaft diameter is the same as the later AMC `boxes, not the bigger diameter spline found on original versions for which there are currently no levers available. We aim to always have one on the shelf here in the UK.

Only offered with the standard Norton change direction, with the correct Manx shell offset & with the Manx type mainshaft: 22mm of clutch spline plus 15mm of thread.

TTI gearboxes use different final drive sprockets from other gearboxes & we supply each `box with one 520 (5/8" x 1/4") sprocket. 

Gear ratio`s are: 1.96, 1.46, 1.18, 1.00