Shaft Effect and Technique

Actually losing traction while in a curve takes very little HP with either tire.
ime HP plays less of a role than TORQUE
Roundabouts need drainage - the simplest/cheapest way is run-off to the outer edge - negative camber. Here I KNOW that many are designed SPECIFICALLY to make them near impossible to take at speed. This one particularly is a real bastard Google Maps


And on a really nice bit of fast road near my mum in the UK there is a roundabout placed to slow down traffic. A plus I guess you have is that (from what little I know of the US NW) you get a fair amount of rain all year - so there is little diesel build up.
 
"The longer the swing arm, the less leverage it has to do so ????" surely that would be the other way around . longer bar gives more leverage ???
 
Spot on Paul she definitely works best with the old slow in fast out technique my local Plastic fantastic boys love it .
One thing I do know is if your mid corner and carrying speed and the corner closes in on you a bit quicker than you were expecting NEVER close the throttle it feels like someone put a hinge in the fame and things get interesting as the old gets a bit upset