Re: Gas or ebike?
Go to the Endless Sphere site. There are the best of the best electric bike builders there. Ask questions and you will get answers.
My bike is built to go 20 mph with a 500W geared hub motor and a 36V lithium polymer battery with a 20 mile range. Cost of the battery and hub motor? Close to $1,800.
It's legal everywhere I go. I weighed this against the $5.000 fines some of the members have been given for having gas motors on bicycles. Check you local and state laws first.
My current build has a 98cc gas motor and a 2 speed transmission which puts it the motorcycle status. Can't ride it on the road where I live since I can't register it. Needs an approved makers assigned vin number. At least I can say I built it.