hey folks this is completely off topic so please for give me. im thinking of buying a tandem bike. new or second hand will do. if anyone could give me some suggestions on what i should be looking for. i.e frame size, how many gears should it have good makes and models and so on. im 5 foot 11 in height for frame size and there is a lot of hills around where i live. i dont know how many gears a tandem bike has? also if anyone knows someone selling a tandem. if they could forward some details to me off list so i could take it into consideration. many thanks and sorry again for off posting. Regards Vincent