Always wondered how do the gear ratio on a BMX compare to a mountain bike as far as inches forward per crank revolution go? Never had a BMX. I was always a tall very skinny lad and being on a BMX just made me look like a stick insect! I know now I would have been rubbish at it as well as I lack the 'fast twitch' muscle fibres that allow sprinting. The above bike looks a cracker to my untrained eye though!