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  1. #1
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    Spur/Pinion Application Chart

    Is there a chart out there that shows the different uses for the pinion/spur applications for uses on road, grass, dirt etc. I am still a little confused on how to use different ones for different applications. When the numbers of the teeth on the pinion/spur get close together (number wise like 31/76) the faster it could go. The further apart like 19/90 the slower????
    Rustler VXL
    SPC Lipo's
    Align T-Rex 450 Pro

  2. #2
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    the smaller the pinion gear the more acceleration and less top speed, the higher the pinion gear the higher the top speed with slow acceleration. the larger the spur the faster acceleration and the smaller the spur the slower acceleration with higher top speed.

  3. #3
    RC Turnbuckle Jr. Desert JATO's Avatar
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    this written by "CHIEFENENX" :

    Smaller Wheel = Gear Up
    Bigger Wheel = Gear Down

    Gear Down: - Pinion or + to Spur (Numerically Higher Ratio)
    Gear Up: + Pinion or - from Spur (Numerically Lower Ratio)

    NOTE: Pinion count has more effect on gearing than Spur count
    (IMO adjust Spur 1st)

    Spur:
    Higher # of Teeth = More Acc. BUT Lower Top End
    Lower # of Teeth = Less Acc. BUT Higher Top End

    Pinion:
    Higher # of Teeth = Less Acc. BUT Higher Top End
    Lower # of Teeth = More Acc. But Lower Top End

  4. #4
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    awesome, thanks for the breakdown on this. Thanks. Happy Bashing!!!
    Rustler VXL
    SPC Lipo's
    Align T-Rex 450 Pro

  5. #5
    RC Turnbuckle Jr. Desert JATO's Avatar
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    you're welcome

  6. #6
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    Quote Originally Posted by chuckmnnorris
    the smaller the pinion gear the more acceleration and less top speed, the higher the pinion gear the higher the top speed with slow acceleration. the larger the spur the faster acceleration and the smaller the spur the slower acceleration with higher top speed.
    This mostly only applies to brushed motors, which have a set amount of torque that they can deliver. The design of brushless motors is such that as your gear higher (higher amp draw), they produce more torque. So, in fact, gearing up with a brushless motor produces both faster acceleration and higher top speed. (However, it produces more heat, and drains the battery faster.)

    Which is why lipos have such great "punch". They can provide a lot of amps for that intial kick off of acceleration. As long as your battery can keep up with power delivery and you can safely dissipate the heat, gearing up with brushless gives you higher performance all around.
    Two Rusty VXLs, M2Ks 18/83 - Tag! You're it!

  7. #7
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    Quote Originally Posted by bobbyrc
    Is there a chart out there that shows the different uses for the pinion/spur applications for uses on road, grass, dirt etc. I am still a little confused on how to use different ones for different applications. When the numbers of the teeth on the pinion/spur get close together (number wise like 31/76) the faster it could go. The further apart like 19/90 the slower????
    Yes. You can use Pinion Spur Motor Kv setup VS Speed and Heat. It's a compilation of all recommended setups by Traxxas compiled from their Owner Manuals.

    It helps you see the rated speed for any given motor Kv, pinion, spur and tire. You will also see the work ratio of your system which drives the motor heat. So you can chose a setup which will give you desired speed by keeping the heat in control.

    You can then do the same for any other motor to compare which motors give you the best needed results.

    I hope this helps
    Slash 4x4 Ultimate, Slash 2WD, SCX10 Defender 90

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