Gearing for FDR of 3.2

xdon · **Joined:** Thu May 17, 2012 17:52:58 **Posts:** 4

What 48dp spur gear size are people using to get down to an FDR 3.2?

Don

Jack I · **Joined:** Fri Sep 30, 2011 21:19:58 **Posts:** 21

what pinion have you got?

xdon · **Joined:** Thu May 17, 2012 17:52:58 **Posts:** 4

I'm moving to 17.5 blinky from 13.5 timed and need to get a new set of pinions and spurs.

I understand that 17.5 can be geared down as low as 3.2 on a large track and wondering what combination of spur/pinion people are using to gear this low (I understand that not all combinations will fit).

Jack I · **Joined:** Fri Sep 30, 2011 21:19:58 **Posts:** 21

what car have you got? because different cars have different internal ratios.

if you have one of the T3 series the internal ratio is 1.9

so to get dead on 3.2 you would need 44 pinion and 74 spur.

XRAY - Model racing cars

Gearing for FDR of 3.2

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