b44 spur gear

[JordanRobinson]

just wondering if b44 and b4 spur gears the same??

cheers

[MiCk B.]

Yep they are the same size.

The stock spur on the B44 was an 84t. A lot of people ran an 81t to move the motor in.

The stock spur on the B4 was an 81t. Again a lot of people ran a 78t or smaller to move the motor forward.

MiCk B. :-)

[JordanRobinson]

ahh right, thanks mate

[Martijn]

hi,
I drive a B4, a 81 spur and 23 pinion, (and Co27 trinity)
What pinion should I run with the 78 spur to have same like 81.

Thanks

Originally Posted by MiCk B.

Yep they are the same size.

The stock spur on the B44 was an 84t. A lot of people ran an 81t to move the motor in.

The stock spur on the B4 was an 81t. Again a lot of people ran a 78t or smaller to move the motor forward.

MiCk B. :-)

[MiCk B.]

Just work out the overall ratio.

Spur / pinion x internal ration = overall ratio.

So 81 spur with a 23 pinion

(81/23)*2.6 = 9.16

So for the 78 spur

(78/pinion)*2.6 = 9.16

(78*2.6)/9.16 = pinion

22.13 = pinion 22 pinion is the closest

So 81/23 gives an overall of 9.16
AND 78/22 gives an overall of 9.22

So that the closest you can get switching from the 81 spur to the 78 spur.


MiCk B. :-)

[Martijn]

Thanks!