Sprockets & Speed

[SAMMY]

just thought id let ppl know that if your in adelaide racing at pooraka its good to run a 6-74 or close 2 that as we have a small track and it has alot of turns so therefore u need acceleration


p.s 200th post

[Strez]

Here's one for you . if you know what top speed you want to achieve (within reason ) use this formular


S = RPM x T / G

RPM is obviously revs per minute
T is the Circumference of your back tyre in meters
(SAVA tyres are diferent to chinese tyers)
G is your gear ratio (eg 6to54 = 9)
S is speed in meters per minute (60km/h = 1000 meters per minute)

if you don't have a dyno but know that if your mum chases you in the car and you are doing a top speed of 60 klicks your max RPM can be found by

RPM = S / T x G

once you know your max RPM and you know what speed you want use this to get your gearing

G = RPM x T / S

now my head hurts . make sure you use the right units .I'm going for a lie down.

[DELLORTO]

ive got my polini {5.2hp} up to 90km/h {scary!} it just show how fast little bike can be.......