I have a Giant Escape, with a 750 BBS02. Like most bikes it is "legally" limited to 20-28 mph, and power is cut off when that speed is reached.
The progamming allows specifying the wheel size. I am thinking that the measured speed of the bike (mph) is determined by the distance per wheel revolution (wheel diameter x pi ) x the number of revolutions per hour (which is counted by the speed sensor ring). If I set the wheel size as 20" vs actual approx 28", will the bike "think" it is traveling less distance per wheel revolution than it actually is, and therefor allow for an actual higher top speed.
Yes you can trick your controller to get higher top speed but it makes no sense , your speed will always be wrong on your readout, like I said get an eggbeater or a controller that has no top speed limitation.