The single disc on the front is obviously a mediocre attempt at becoming Japanese. If you get a bike as heavy as that really going, that brake would be insufficient, and the prior drum front brake was just a joke. But a bike with a standard Norton gearbox is probably never really fast anyway. An 850 Commando motor can be fast enough to get anyone into trouble, but it needs a bit of help. My Seeley 850 runs on methanol, but with a bit more effort it would be just as quick on petrol. I race it against methanol-fuelled 1000cc CB750 Hondas, and it is right up there with them. Which is very strange, because when I built the bike I believed it would never be fast enough. My friend worked for S.R.Evans in Melbourne, who sold H2 and H1 Kawasakis as well as Commandos. They used to do pre-delivery on the bikes and road test them on a very fast winding road. The Commandos were as fast as the Kawasakis.