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  1. #1
    RC Enthusiast
    Join Date
    Oct 2019
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    21

    Do i need to change gearing with 2.2 traxxas rustler tires on brushed 2wd slash?

    I just put rustler tires on my 2wd slash, it makes a really weird burning smell but no smoke, do i need to change gearing?

  2. #2
    RC Qualifier
    Join Date
    Apr 2018
    Posts
    942
    Check your slipper clutch. It may be loose.

  3. #3
    RC Champion zedorda's Avatar
    Join Date
    Sep 2015
    Location
    S.E. Michigan
    Posts
    1,126
    When it comes to gearing rim size really isn't what is important. The OD of the tire is. If you put larger wheels on that are taller than the originals you are changing the total gear ratio. If the wheel is taller you will need a small pinion or larger spur gear to get back to the original total ratio.

    I use this tool to help me figure my total gear ratio: https://scriptasylum.com/rc_speed/top_speed.html

  4. #4
    RC Champion Mr Wolf's Avatar
    Join Date
    Feb 2011
    Location
    Malmesbury, UK
    Posts
    1,704
    Rustler tires are too wide to tuck under the Slash's wheel arches when the suspension compresses so maybe it's the smell of burning tire rubber due to rubbing on the body.
    Pretty please, with sugar on top, clean the RC car

  5. #5
    RC Enthusiast
    Join Date
    Oct 2019
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    21
    I checked the body and ita not it, the motor smells like a cigar.

  6. #6
    RC Enthusiast
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    Oct 2019
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    21
    I will see if changes gearing will help

  7. #7
    RC Enthusiast
    Join Date
    Aug 2019
    Location
    Woodstock, Ga
    Posts
    36
    I dont think the tires are the cause. Sounds like the motor got too hot. Usually dies soon after. Use compressed air to clean it and lube the bushings at each end of the motor. Maybe it'll last a little longer.

  8. #8
    RC Enthusiast
    Join Date
    Oct 2019
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    21
    It was a fully hot

  9. #9
    RC Enthusiast
    Join Date
    Aug 2019
    Location
    Woodstock, Ga
    Posts
    36
    Try going down teeth on the pinion gear. And consider drilling some 1/4 inch holes in the windshield. A transmission case with an aluminum mounting plate makes a huge difference in cooling. RPM or HR racing makes some.

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