Pinion and Spur selection

[KryptoniteKummins]

One of the things i still need for my tow rig is the proper spur and pinion selection. I'm running stock locked scx10 axles with a 45 turn team integy motor. My transmission is an aluminum case, metal gear scx10 transmission with an aluminum 88t gear pre installed. I don't need crazy speed for this rig so i don't know if the current gear is good or bad. The rig will be towing a 2 place 5th wheel trailer and will also be used for plowing. I'm running it on 1.9 ripsaws for right now. Can anyone help me choose or show me a chart or something to figure out the proper gearing? I did find the gear ratio chart in the noobie listings, but it didn't help me. I guess i'm really just looking for people's suggestions from what they've driven with already and what would work best?

 

[AddictedtoRC1]

It's gonna depend on what gear ratio you are looking for and what ratio is recommended for your motor.

Example: suggested ratio for my Holmes Hobbies 35T is 5.5:1.

To figure out which pinion I need I divide my spur tooth count which is 87 by 5.5 which is the ratio I am seeking.

87 divided by 5.5 equals 15.818. So I can run a 16T pinion and be close enough to a 5.5:1 ratio.

It works the other way as well. Say you have an 88T spur with a 14T pinion. Divide 88 by 14 and you get a ratio of 6.285:1

 

[KryptoniteKummins]

how do i figure out what the recommended ratio is? The motor packaging had zip for info on it other than it being a 45 turn

 

[AddictedtoRC1]

My guess would be that 5.5:1 is generally a good ratio across the board. Another general rule is volt up, gear down. The key is to keep motor temps low.

 

[RootBreaker]

My guess would be that 5.5:1 is generally a good ratio across the board. Another general rule is volt up, gear down. The key is to keep motor temps low.

now does wheel size matter? in the real word i know it does...
"thumbsup"