The bike with the specs you listed will not be 450 level.
First, 450s make 60+ hp and weigh like 240 lbs with a full tank. If you have any business racing a 450 it will be hard to make an ebike that meets those criteria for a 12 minute race.
Even if you accept the 55kw motor, (55kw is input, actual output to the wheel about 55 horsepower, after realistic motor and controller losses), you will need a pretty big battery.
Finally, a transmission will not be needed and just adds extra weight you could have put towards more battery or more powerful motor. Consider the Alta, which kicks ass even though it's too heavy and weak.
First, 450s make 60+ hp and weigh like 240 lbs with a full tank. If you have any business racing a 450 it will be hard to make an ebike that meets those criteria for a 12 minute race.
Even if you accept the 55kw motor, (55kw is input, actual output to the wheel about 55 horsepower, after realistic motor and controller losses), you will need a pretty big battery.
Finally, a transmission will not be needed and just adds extra weight you could have put towards more battery or more powerful motor. Consider the Alta, which kicks ass even though it's too heavy and weak.