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BrianG · 07.17.2006, 03:15 PM

The Jato has a 54T, 56T, and 58T spurs available in 32p. If you use Revo spurs, which are Mod 1, you have 36T, 38T, and 40T. Revo spurs do fit.

I'll list a few gears and their diameters to make my next argument easier:

Mod1
- 40T = 42.67mmD
- 38T = 40.53mmD
- 36T = 38.40mmD
- 20T = 21.33mmD
- 18T = 19.20mmD
- 16T = 17.07mmD
- 14T = 14.93mmD

32p
- 58T = 48.33mmD
- 56T = 46.66mmD
- 54T = 45.00mmD
- 22T = 18.33mmD
- 18T = 15.00mmD

Purely for sizing purposes, I lined up an 8XL motor (just to guage the clearance between the motor and the tranny using real parts) with a 14T mod1 pinion with a 54T 32p spur. The clearance is VERY close, but do-able. So, I added the two diameters together and divided by two to get the distance from the tranny shaft to the motor shaft, which is about 31mm. So, no matter which gear set I choose, I have to have at least 31mm between the two shafts or the motor will hit the tranny.

Now, a little info about my Jato. I did the single speed conversion, which has a ratio in between 1st and 2nd. If I use the stock spur/clutchbell ratio, 3s Li batts, and the BK 10S motor, I get about 45mph. A little slow, but I didn't factor a couple things. So, I want to keep the spur/pinion ratio the same or lower for equal or more speed. 54T/22T is 2.45:1. Using a 40T, that means I would need to use at least 18T to get the same ratio and keep a safe diameter. I can't use anything larger than a 54T 32p spur because the rear a-arm could conceivably hit the spur under certain conditions (although unlikely).

So, long story short:
Using 32p, I need 54T spur and 22T+ pinion.
Using Mod 1, I need 40T spur and 18T+ pinion.

Then, aside from all of this, I have to make sure the pinion I select is available in the shaft bore I need. Ugg.

	(#8)
BrianG RC-Monster Admin Offline Posts: 14,609 Join Date: Nov 2005 Location: Des Moines, IA	07.17.2006, 03:15 PM The Jato has a 54T, 56T, and 58T spurs available in 32p. If you use Revo spurs, which are Mod 1, you have 36T, 38T, and 40T. Revo spurs do fit. I'll list a few gears and their diameters to make my next argument easier: Mod1 - 40T = 42.67mmD - 38T = 40.53mmD - 36T = 38.40mmD - 20T = 21.33mmD - 18T = 19.20mmD - 16T = 17.07mmD - 14T = 14.93mmD 32p - 58T = 48.33mmD - 56T = 46.66mmD - 54T = 45.00mmD - 22T = 18.33mmD - 18T = 15.00mmD Purely for sizing purposes, I lined up an 8XL motor (just to guage the clearance between the motor and the tranny using real parts) with a 14T mod1 pinion with a 54T 32p spur. The clearance is VERY close, but do-able. So, I added the two diameters together and divided by two to get the distance from the tranny shaft to the motor shaft, which is about 31mm. So, no matter which gear set I choose, I have to have at least 31mm between the two shafts or the motor will hit the tranny. Now, a little info about my Jato. I did the single speed conversion, which has a ratio in between 1st and 2nd. If I use the stock spur/clutchbell ratio, 3s Li batts, and the BK 10S motor, I get about 45mph. A little slow, but I didn't factor a couple things. So, I want to keep the spur/pinion ratio the same or lower for equal or more speed. 54T/22T is 2.45:1. Using a 40T, that means I would need to use at least 18T to get the same ratio and keep a safe diameter. I can't use anything larger than a 54T 32p spur because the rear a-arm could conceivably hit the spur under certain conditions (although unlikely). So, long story short: Using 32p, I need 54T spur and 22T+ pinion. Using Mod 1, I need 40T spur and 18T+ pinion. Then, aside from all of this, I have to make sure the pinion I select is available in the shaft bore I need. Ugg.