Hi there, I'm looking to modify my gas powered scooter to electric, and am looking for some help in choosing parts. I have attached a picture of the scooter in its current form. The wheels are 9", with a 45 tooth chain sprocket. The chain is 8mm (though I am not against changing the sprocket and chain if advisable). I would like to be able to go 15-20 mph (though will settle for 15mph if I have to). Will be used on flat road for commuting to transit stop (6 miles round trip). I weigh about 210 lbs. Based on the calculator on this site, I should be able to achieve 20mph with a motor that has a drive sprocket of 11 teeth, so I presume the key is to ensure I have enough power for my weight, and also enough amp-hours to be able to do 6 miles on a charge. Assistance with choosing the right motor and battery pack would be greatly appreciate.