If you have not bought a bicycle yet, you may want to consider the GT2 by Grubee. USA Bicycle has it on sale for $315. Its a steel frame bicycle with suspension forks, heavy duty wheels, and threaded sprocket mount, as well as a built in gas tank. Well worth the money. I bought mine when the price tag was $550, wish I would of waited but o'well.
http://www.usabikemotors.com/index.php?main_page=index&cPath=16_18
