This is my results of 2 builds in 2 weeks. Rode em both this afternoon.
The Slanthead is a hillclimber, or good city commuter that easily pulls away from standstill without help. Maxes out about a bone rattling 35mph with the 41t.
The Sunn with the HS/chainbox is a highway cruiser. Needs pedal assist to start. Clutch don;t engage good till about 15 mph low throttle or 20mph hard throttle.
Getting bout 42 mph at about 7000 rpm. Has trouble with steep hills though.
Very quiet and smooth at all speeds.
Real smooth effortless cruise at 30-35 mph .