What sprockets for 70MPH or more.

[Megadan]

Originally Posted by Bill Hilly

I know Jerry runs ,or did run similar sprocket sizes on his Hawk, but for most of us that gearing is too high for our Hawks. The popular sprocket sizes that most switched to on the TBR7 is the 42/17, which is about like a 45/17 on a Hawk, because the rear tire has a good bit more circumference.

Spot on. If you are close to 200lbs, or more, anything lower than about a 17 front and 43 rear is going to start hurting performance. Of if you live anywhere with actual hills to contend with.