My ideal setup would be to be able to pull top speed in the next to top gear and have top gear as an overdrive, for relaxed cruising. I can't quite do that on my 4 speed because the spacing is too far apart. 3rd gear is too short and 4th is too tall. My bike could do 65mph, but 60 is the best it'll do in 3rd, screaming it's head off, and 58 is the best it'll pull in 4th. However it cruises at 50 nicely and anything faster gets scary. The Monkey feels so much more solid at that speed, and would benefit with a close ratio 5 speed.