Fitted the rear caliper with 140mm stock disc its fairly close to the rim around 1mm or so but it does not rub, all runs true no knocks or bangs so its good to go, the front has just under 3mm caliper clearance to rim but at the moment nothing is rubbing at all and thats a first, so its going to roll better and with a larger disc upfront and hydraulics it should stop better and feel easier to control my slowing speeds.
Rim diameter= 6.5inchs ×2.54cm = 16.51cm (2.54cm In 1 inch)
Tyre profile= 6.5cm ×2 = 13cm + 16.51= 29.51cm wheel diameter
Wheel diameter × pi = wheel circumference
160934.4 cm in mile
Cm in mile ÷ wheel circumference = wheel rotations per mile
160934.4÷92.7083209 = 1735.9218507
Wheel rotations per mile × top speed = wheel rotations per hour
1735.9218507×45.3mph = 78637.2598406
Wheel rotations per hour ÷ 60mins = wheel rotations per minute
Wheel RPM × gearing = Motor RPM
1310.6209972 × 4.9090909 = 6433.9576110 rpm
Rpm ÷ voltage = kV
6433.9576110÷ 60.8v=105.8216712rpm/volt (45.3mph ruff estimate no voltage sag taken into account)
7101.4984673÷67.2v=105.6770605 rpm/volt (50mph complete estimate lower kV would suggest its possible )
I did not take voltage sag into account for rpm volt as I only looked at the packs stationary volts of 60.8 or 3.8v cell, for the 45.3mph test and the 50mph is fictional at the moment its just a ruff estimate but it proves it is on the cards and 45.3mph theres was no significant heat build up in the motor and I did not trigger my 3.7v alarm, I believe a full pack will have less sag too so with the 7100rpm kV calc above showing a slightly lower kV outcome with full battery voltage, its showing my system is just about capable of 50mph and considering I hit 45.3 mph with a flat 16s battery with a cell voltage of 3.8v and under, and it was still accelerating with a bit more torque available I believe that with a full charge and the right conditions and tarmac, 50mph is easily within my grasp on this budget scooter with a stock motor.
Done my rpm calcs for my speeds from achieved speeds.