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Thread: VIDEO : SCRUB RADIUS - What it's All About & The Dynatrac PRO 1550 Knuckle

  1. #21
    LOSER chitown35's Avatar
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    Quote Originally Posted by TrainWreck618 View Post
    Rancho Reid

    Two different company's


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    Haha oops I hear knuckles and it translates to reid. I wonder if it's similar though.
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  2. #22
    Meme King WJCO's Avatar
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    Quote Originally Posted by chitown35 View Post
    Haha oops I hear knuckles and it translates to reid. I wonder if it's similar though.
    They are similar. I sent Jeeeep a private msg about this so as not to clutter up the Dynatrac thread anymore. The Dynatrac knuckles are massive and badass for sure.

  3. #23
    Fresh Catch cameleer's Avatar
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    Very interesting, but now I have a scrub radius question.
    A Jeep JK stock wheel backspace is 6.25". With 32" tires this has the stock factory scrub radius.
    Changing to aftermarket wheels with a backspace of 4.5", the scrub radius is now off from stock.
    Adding 37" tires changes the scrub radius again, moving it closer to stock.
    I would like to know, with aftermarket wheels backspaced at 4.5". What size tires will put you back to the stock scrub radius, or the best scrub radius.

  4. #24
    Administrator wayoflife's Avatar
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    Quote Originally Posted by cameleer View Post
    Very interesting, but now I have a scrub radius question.
    A Jeep JK stock wheel backspace is 6.25". With 32" tires this has the stock factory scrub radius.
    Changing to aftermarket wheels with a backspace of 4.5", the scrub radius is now off from stock.
    Adding 37" tires changes the scrub radius again, moving it closer to stock.
    I would like to know, with aftermarket wheels backspaced at 4.5". What size tires will put you back to the stock scrub radius, or the best scrub radius.
    Only back spacing will change the center line of your wheels.

  5. #25
    Advertiser Dynatrac's Avatar
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    We are excited to see the positive response. If you've asked us a question, we need time to go over each one and make sure we answer accurately. Please be patient as we're working to answer everyone, and thanks for the questions!


    www.dynatrac.com
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    Customer Support email: expeditor@dynatrac.com

  6. #26
    Meme King WJCO's Avatar
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    Quote Originally Posted by cameleer View Post
    Very interesting, but now I have a scrub radius question.
    A Jeep JK stock wheel backspace is 6.25". With 32" tires this has the stock factory scrub radius.
    Changing to aftermarket wheels with a backspace of 4.5", the scrub radius is now off from stock.
    Adding 37" tires changes the scrub radius again, moving it closer to stock.
    I would like to know, with aftermarket wheels backspaced at 4.5". What size tires will put you back to the stock scrub radius, or the best scrub radius.
    Quote Originally Posted by wayoflife View Post
    Only back spacing will change the center line of your wheels.
    I was just about to answer this the same thinking tire size won't change the scrub radius. That is by width. But then I thought about it....the height of the tires would change it as the lines intersect at a certain height. But I don't know the answer of the question. I would take a picture from the front of the Jeep, then on your PC, draw your imaginary lines, then look at how much more or less you would have to increase/decrese the tire height to get the lines to intersect right where the tire patch meets the ground.

    Then you'll have to measure on the tire itself, etc.

    Untitled.jpg
    Last edited by WJCO; 03-20-2017 at 06:18 PM.

  7. #27
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    Very informative.. Thanks.

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  8. #28
    Fresh Catch Anvil JKUR's Avatar
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    Great video. It's nice to see a solid company explaining the engineering that goes on with there product manufacturing. Very cool!



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  9. #29
    Fresh Catch cameleer's Avatar
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    Quote Originally Posted by WJCO View Post
    I was just about to answer this the same thinking tire size won't change the scrub radius. That is by width. But then I thought about it....the height of the tires would change it as the lines intersect at a certain height. But I don't know the answer of the question. I would take a picture from the front of the Jeep, then on your PC, draw your imaginary lines, then look at how much more or less you would have to increase/decrese the tire height to get the lines to intersect right where the tire patch meets the ground.

    Then you'll have to measure on the tire itself, etc.
    Yes, that was my point. The steering axis inclination line will be at a different point with larger tires. If I understand it right, this will change where the scrub radius is according to tire size.
    I'm running a Dynatrac ProRock 44 with Reid racing knuckles, but the scrub radius does not change with this setup. Also have wheels backspaced at 4.5" and 37" tires. I'm thinking this may bring me close to the proper scrub radius.

  10. #30
    Caught the Bug Ragnar JK's Avatar
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    very interesting and informative explanation - you always like it when a pro can make it sound so straight forward.

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