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for 50mph i expect to be doing around 3900rpm. On stock geardrive i would be doing around 5800rpm.
These means 20,8Km/h - 1000rpm.
I have good experiences with Honda NX250 Dominator (i put 21Km/h-1000rpm) and Suzuki GN250 (i put 18,8Km/h-1000rpm) so i am pretty confident that zzr 250, than have more torque and hp, will be OK. Pretty soon we will know about it... I even made one YAMAHA XJ600Diversion 34,8Km/h-1000rpm with good results.
I will have the 55mph at 5500rpm on my 4th gear so i will be able to try your suggestion and evaluate differences, but why do you say its the best combination? based on intuition or is a math fact? I think and hope that going uphill may mean that i have to change gear, not only that will make my trips funniers (i like to make this kind of decisions while driving) but also it will mean that when i will be riding on straight or dowhill i can change gear again and low rev the engine.
For cruising on straight at 55mph i figure i will need abaut 8hp on wheel and i expect KAWA to have that power on 20%accelerator at 3800.
I have a back up plans as i will keep the 14 to front and i have a 38 to back so i can manage more combinations (14-33, 14-38, 15-38) also I will keep standard gear drive kit.
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