What sprockets for 70MPH or more.

[Bill Hilly]

Originally Posted by alex_in_az

I'm running 17/40 and have hit 75 at a little over 7200rpm. I don't recommend going any faster than that as the front end can get pretty loose. you're going to have to do all the mods I list in my signature for enough torque to pull that speed

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.

[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.