5sp triumph box option, also involves going with a non standard, or triumph clutch

A 4 speed Manx gear cluster with a Commando first gear might work better. With a normal Manx gear cluster on a race track, the ratios are perfect everywhere except in a clutch start. The low first gear is needed to get the bike rolling from a stand-still. After that, first gear is never used. My Manx cluster cost $730 Australian. Most of the guys who race these days, probably use TTI gearboxes, so there might be a few Manx clusters about which are not being used. The gear spacing in the Triumph box might be wider. The Manx ratios behind the 850 motor are excellent.
 
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John Maher is an old Victorian A grade rider. He races a 500cc Manx in historic races. When I discussed gearing with him, he told me that he has 3 first gears for his Manx which he uses on different circuits. Most of the gears from older 4-speed Norton gearboxes fit the Commando gearbox.
 
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