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rob
09-04-2000, 10:32 PM
In a touring car would it be faster: 68t spur and a 22t pinion
or
75t spur and a 25t pinion


They both come out to like a 3 gear ratio but doesn't it make a difference because the difference in gear sizes?help me please

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<RoB>

Grant Tokumi
09-04-2000, 10:48 PM
75/25 = 3.0
68/22 = 3.09

The 75/25 gear ratio will give you slightly higher top speed (it will go faster).


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Grant Tokumi
R/C Archive
http://www.rcarchive.com

Grant Tokumi
09-04-2000, 10:58 PM
The only thing that matters is the gear size relative to each other. You can have a 10 tooth pinion and a 30 tooth spur, and its exactly the same as a 20 pinion / 60 spur since both give gear ratio of 3.0.

Another way to look at it is like this:

Using 20 tooth pinion - 60 tooth spur.
The 20 tooth pinion gear needs to spin 3 rotations to make 1 rotation of the 60 tooth spur gear.

Using a 40 tooth pinion - 120 tooth spur.
The 40 tooth pinion gear still needs to spin 3 rotations to make the 120 tooth spur spin once. Bigger gears, but same result.

Hope this helps.
Grant