Both bikes have similar power, but because of the bigger wheel size the fatty is about 5 mph faster. The fatty cost about $2000 to build which included the bike. The Fold was a couple hundred less. Fatty does 27 mph hot off the charger. Both bikes are 750w, 48v. The fatty has a 35 amp controller, and the Fold has 25 amp. I have a 30ah battery in the fatty which gives the bike a huge range. Almost 40 mile running near top speed, and 80 or 90 miles at bicycle speeds. The Fold is 14ah, and has good, but not phenomenal range. It's do about 20 miles at speed, and the record was about 40 miles.