F = ma
If your up on the Newtons Law of Motions you will know his Second law tells us ‘The vector sum of the external forces F on an object is equal to the mass m of that object multiplied by the acceleration vector a of the object: F = ma.’
What does this mean in the real world of BMX ??? Well the lighter your bike, the faster you will be able to accelerate up to top speed. Getting you to the first turn first.