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Old 09-13-2005, 09:59 PM   #1
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GEARING?????

I got a HPI RS4 electric(first gen) for my daughter to run and in the book and on HPI it says it has a 106t 64 pitch spur gear. What is the correct one for the 48 pitch to run? 81, 84, ect?
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Old 09-13-2005, 10:08 PM   #2
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Originally Posted by BIG DADDY8
I got a HPI RS4 electric(first gen) for my daughter to run and in the book and on HPI it says it has a 106t 64 pitch spur gear. What is the correct one for the 48 pitch to run? 81, 84, ect?
Yeah, right around there. The Xray has an 87 tooth spur and most guys are running the 116 tooth because it is the same size in diameter as the 87.
I would say a 112 would be close.
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Old 09-13-2005, 10:20 PM   #3
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I have a 116 spur in my car with a 35 tooth pinion. I get roughly the same (3.31 in my Pro2 compared to 3.33 in my Pro4) ratio with a 76 tooth spur and a 25 tooth pinion. But my Pro4 spur is limited by its size. The Pro2 has no space limitations. I'd say 81 would put you in a very good ballpark.
-Josh
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Old 09-14-2005, 08:13 AM   #4
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Quote:
Originally Posted by BIG DADDY8
I got a HPI RS4 electric(first gen) for my daughter to run and in the book and on HPI it says it has a 106t 64 pitch spur gear. What is the correct one for the 48 pitch to run? 81, 84, ect?
it should be like 80t for 48 pitch

for 64 pitch take, 106t x 1.5 then divide it by 2 = (48 pitch)
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