Join Date: May 2005
Location: California, Napa Valley
I’m a bit confused by your overall drive ratio. Also, you’re missing the primary drive ratio; according to the specs on for a 2004 ZX6RR, the primary ratio is 2.022.
(edit...OK, so you're saying that your primary ratio is 1.893 by giving the overal ratio in sixth as 6.255. That makes sense since the 636 is supposed to have a bit more grunt. I'll update the numbers below to reflect the taller overall gearing)
Basically it works like this: RPM divided by the product of the gear ratios divided by inches in a mile multiplied by pi multiplied by tire diameter multiplied by minutes in an hour. Taking this format, your top gear looks like this with the stock sprockets: 15,500 / (1.153x1.893x2.866x7) / 63360 x 3.1416 x 24 x 60 = 25.27 MPH @ 15,500 RPM in sixth. If you change your sprockets to achieve a 1:1 ratio, you’ll finally be up to 72.44 MPH at max RPM in sixth.
Even at that, your gear breakdown looks like this: 1st = 28.57 MPH, 2nd = 41.24 MPH, 3rd = 50.13 MPH, 4th = 57.60 MPH, 5th = 65.66 MPH, 6th = 72.44, all at max rpm.
Life's like a play; it's not the length but the excellence of the acting that matters. ~Seneca
Last edited by Rotty; 01-28-2009 at 04:03 PM.
Reason: Correct primary drive ratio