I'm riding a Diamondback with a center-framed Tanaka 47R engine, hooked up to the bike's 8-speed cassette. I ride it to work about twice weekly, 12-mile round trip. Takes me 20-25 minutes to reach work, stopping @ all the lights. Been riding about 8 years. First bike had electric hub, weighed 135lbs with batteries. 27mph/50-mile range. Your tire is HUGE! Mine's are 2.35 x 26 Schwalbe. Building another bike, will use 3" motorcycle tires.