i am looking into buying a cheap 200cc Jet dirt bike from ebay. they are brand new and are like replicas of name brand bikes. they say they will go 70+ mphs. i sent an e-mail to the buyer asking if that was true. i asked of they would go that fast on a smooth surface with an average size rider. they said it should easily go 70 mph. they are new bikes,200cc, 4 stroke, and i weigh 175 lbs. do you think they actually go 70 because i need one for highway use and i don't want to wrap it out going 55-60
what do you guys think?

 

No, thinner the tires mean a higher top speed. maybe by just a little like 2 to 3 mph more top end, but yeah.