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  1. #41
    Knows a Thing or Two Journeyman's Avatar
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    So does castor effect the scrub radius? Curious cause when we lift our jeeps we usually lose a couple degrees of negative castor for the sake of the front drive line.


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  2. #42
    Old Timer JKRay's Avatar
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    VIDEO : SCRUB RADIUS - A Look into the Design of the Dynatrac PRO 1550 Knuckle

    Awesome video! Thanks!


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  3. #43
    Token East Coast Guy MR.Ty's Avatar
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    I am now educated on Scrub Radius! Thank you Dynatrac and WAL!
    2014 JKUR "Stumps"

  4. #44
    Been Around the Block TOPLESS's Avatar
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    Quote Originally Posted by MR.Ty View Post
    I am now educated on Scrub Radius! Thank you Dynatrac and WAL!
    I second this thought!

  5. #45
    Hooked doubletapdaddy's Avatar
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    Quote Originally Posted by cameleer View Post
    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.
    Holy crap...

    I swear that this was on my 5th grader's math homework last week!?!?!
    (I didn't know the answer then either) Lol.

  6. #46
    Addict JAGS's Avatar
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    Love the detail Jim went into and with having the illustrations. Very cool.
    I think I may consider lifting my Jeep. Or not.
    The Evolution of ENVY

  7. #47
    Been Around the Block scrhino's Avatar
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    So the scrub radius is better the taller the tire. 40 is better than a 37. How does the 1550 compare to the pro 60 wheel end? Does it have a higher inclination angle? Mel said spicy chicken steers better even though he's running 3.5 bs.
    Liston

    2010 JKUR LS3 6.2 430 HP / 6L80
    Instagram: black_rhino_jk

    EVO suspension and bumpers. Warn Powerplant.
    Dynatrac axles and brakes.
    Rockhard 4x4 sportcage.
    37x12.50x17 Trail Grapplers on Atx Slabs.

  8. #48
    Old Timer Ddays's Avatar
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    Add to my weekend-to-do list: Remove wheel spacers

    Great video. Isn't it amazing that just when you think you got this shit figured out, along comes new info that shows how off base you were?

  9. #49
    Administrator wayoflife's Avatar
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    Quote Originally Posted by scrhino View Post
    So the scrub radius is better the taller the tire. 40 is better than a 37. How does the 1550 compare to the pro 60 wheel end? Does it have a higher inclination angle? Mel said spicy chicken steers better even though he's running 3.5 bs.
    The PRO 1550 knuckles were designed with 40" tires in mind and they would be the optimal tire size for them. Spicy Chicken does steer better even though Mel is still running 3.5" of back spacing and it is because of the PRO 1550. Measuring from the far outside edge tire to tire, Spicy Chicken's stance is 1" wider than Rubicat in spite of her 72.5" axle. We physically measured this.

  10. #50
    Been Around the Block sjd78's Avatar
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    Quote Originally Posted by cameleer View Post
    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.
    Do you have any rubbing issues at full lock with the 4.5" bs wheels?

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