Gearing Calculators for Racing Karts: Moto, KZ\ICC and CR250 Shifter Motors

Some of you might recall John Denman’s “Gearcalc.xls” that allowed you to compare the gearing changes for the CR125 and CR80. A few years ago I made some additional ones for KZ\ICC motors and the CR250 as well.

CR125 & 80 GearMaster.xls (45.5 KB)

CR250 GearCalc.xls (43 KB)

CRS GearMaster.xls (60.5 KB)

Debei Moturi GearMaster.xls (32.5 KB)

Debei Spike24 Moturi GearMaster.xls (32.5 KB)

Maxter MXV & MXO.xls (179 KB)

MC Motori BAT 3 GearMaster.xls (32.5 KB)

Motori Seven L3 AT GearMaster.xls (32.5 KB)

Pavesi Evo2 25deg GearMaster.xls (46 KB)

SGM-All.xls (81 KB)

TM K9A, K9B, K9C, KZ10, KZ10B GearMaster.xls (32.5 KB)

Vortex RVS GearMaster.xls (32.5 KB)

Vortex RVXx GearMaster.xls (32.5 KB)

YZ250 GearCalc.xls (62 KB)



…And this is how you confirm your 37 year old DD kart is running with CR125s at your local track. Well, at least when it comes to top speed.

Shifters really aren’t much faster on typical kart tracks anyway. Obese by comparison to the FA 100cc style karts and you waste all that time per lap changing gears.

Of course in bigger tracks it’s a different story. Before the CIK lost the plot, they had shifter and direct drive champs at different tracks. Like this: