p.s.


but if you want the BF math to that equation, you multiply the final number by stem length and add a zero to the end, divide that by seat cost then subrtract the difference in weight of the Di2 from the difference of Sram red (yellow edition of course[color changes weight IRL])=BFavgspeed

edit: add 1mph avg for: new bar tape, carbon fiber anything, each grouppo up you advance, whoosh wheels, and post count