gear ratios

[nightjar]

got a 10.5 motor 81 spur what pinion
thanks

[Col]

103t.

[jasjeet]

20t to 25t i think would be good.

[Steven Forster]

Originally Posted by nightjar

got a 10.5 motor 81 spur what pinion
thanks

What buggy we talking about B4 / B44............other

[Sumilidon]

Same question for me as well please.

B44, 8.5T motor with standard spur gear

[ian h]

Originally Posted by Sumilidon

Same question for me as well please.

B44, 8.5T motor with standard spur gear

Start with 25/26

[Andrew Twigger]

I think you would gain more from learning how to work out your gear ratio for yourself.

Spur / pinion X internal ratio

Once you let us know what car you have, we can tell you the internal ratio (although Google would be quicker..!) and from there you can figure out what pinion/spur to use for any given ratio. So the real question would be "what ratio should I be using for a 10.5?"

[nightjar]

ill try about a 19 or 20 i think
im running a b4 team stealth

[Steven Forster]

Originally Posted by nightjar

ill try about a 19 or 20 i think
im running a b4 team stealth

B4.1 manual recommends 24t pinion for a 10.5t motor running 81t spur for a starting gear ratio !!!

(for some reason B4.1ft manual states the gear ratio for 81/24 for a 10.5t motor will give you 8.42 FDR !!!)

Heres how to calculate the gear ratios

Spur gear 81 divided by pinion gear 24 multiplied by the internal gear box ratio 2.6:1 = Final Drive Ratio (FDR) 8.775 (or 8.78)

81 / 24 x 2.6 = 8.775 (or 8.78)

Check instructions that came with motor as it might have its own preferred gear ratio !!!

[nightjar]

no gear ratios come with the motor but with the b4 manual it says 19 so ill try that its says 24t is 35turn motor

[Steven Forster]

Originally Posted by nightjar

no gear ratios come with the motor but with the b4 manual it says 19 so ill try that its says 24t is 35turn motor

The B4 manual is stating a 19t pinion for a 10 turn BRUSHED motor...............

The B4.1 manual shows a 24t pinion for a 10.5 turn BRUSHLESS as a starting point..............



EDIT: what motor are you running ???

[nightjar]

thanks but ive only got a 23 and 22 so ill go for 23
do you know the right pinoin for a 92 spur gear and 11t motor (brushed) its to go in my bosscat trail conversion 4 1/2 cm of ground clearence so far
thanks

[nightjar]

im running a 10.5t ultra sportsman v2.0 speed passion