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Thread: Servo rod end has damaged side wall. Rare? Solutions?

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Old 02-13-2019, 07:18 AM   #1
Quarry Creeper
 
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Default Servo rod end has damaged side wall. Rare? Solutions?

Maybe you guys deal with this all the time, when you mix brands, but I noticed that the servo rod end where it attaches to the knuckle arm on my scx10ii has been rubbing against the inner wall of my TRX4 Canyon Trail tire. Not all the time, but when the tire distorts under certain crawling conditions. Not much room there, as you can see.



Luckily I caught it in time and have swapped the front tire with an undamaged one from the back.

This picture was taken after I shortened the ball at the top, because it was the screw head making contact, and I shaved away some plastic from the rod end just to be safe.

Is this a common thing? Are there standard solutions?

Thanks....

Last edited by hobbyjumper; 02-13-2019 at 07:22 AM. Reason: speeling
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Old 02-13-2019, 07:23 AM   #2
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Default Re: Servo rod end has damaged side wall. Rare? Solutions?

Just need a different offset on your rims

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Old 02-13-2019, 07:25 AM   #3
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Default Re: Servo rod end has damaged side wall. Rare? Solutions?

Can you put that in layman's terms? Do you mean buy new rims?

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Originally Posted by jokersinsanity View Post
Just need a different offset on your rims

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Old 02-13-2019, 07:28 AM   #4
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Default Re: Servo rod end has damaged side wall. Rare? Solutions?

Quote:
Originally Posted by hobbyjumper View Post
Is this a common thing? Are there standard solutions?
Common when you have a wheel with very little (or negative) offset and with very wide tires. If you are using Traxxas tires on Traxxas wheels as it appears, then you have both of those things going on.

The solution is either wider hexes to push the wheels out, buy wheels with more offset to get the tire more clearance, or narrower tires.
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Old 02-13-2019, 08:44 AM   #5
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Default Re: Servo rod end has damaged side wall. Rare? Solutions?

Put the tie rod below the knuckle arm and the drag link on the top.
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Old 02-13-2019, 08:46 AM   #6
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Default Re: Servo rod end has damaged side wall. Rare? Solutions?

A ha. A quick surf reveals that some manufacturers, like SSD, spell it out, so you can purchase accordingly.

SPECIFICATION

Width: 25.5mm

Offset: 1.0mm

Backspacing: 13.75mm

Weight: 75g

And even include a helpful diagram!



Pitbull is good too...

Width with inner ring: 1.082 (27.48mm)
Offset: .245 (6.22mm)
Backspacing: .330 (8.38mm)

Others make you do the math: .80" wide at the bead surface, 1.0" to outside of wheel

Pro-line gives you width, diameter, and that's it.

Axial doesn't even give you width--fits most tires.

Thanks, guys.
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Old 02-13-2019, 08:47 AM   #7
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Default Re: Servo rod end has damaged side wall. Rare? Solutions?

Worth a try. Thanks.
Quote:
Originally Posted by travis c. View Post
Put the tie rod below the knuckle arm and the drag link on the top.
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Old 02-13-2019, 08:58 AM   #8
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Default Re: Servo rod end has damaged side wall. Rare? Solutions?

I like the hex idea, too. The stock ones are 5mm and there's at least 3mm unused thread past the lock nut. There was even a good thread here in the forum.
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Old 02-13-2019, 08:58 AM   #9
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Default Re: Servo rod end has damaged side wall. Rare? Solutions?

You need wider hexs moving the position of the links will cause more problems you can also put a small washer between the hex and the rim maybe 1mm thick but you realy need 2mm or more to completly stop the rubbing and to many washer under the hex will cause the wheel hex to strip out so your best option is bigger hexes maybe $5-10 dollers
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Old 02-13-2019, 09:08 AM   #10
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Default Re: Servo rod end has damaged side wall. Rare? Solutions?

Thanks. I'm seeing some nice 12 by 8mm hexes in aluminum and brass.

Quote:
Originally Posted by ferp420 View Post
You need wider hexs moving the position of the links will cause more problems you can also put a small washer between the hex and the rim maybe 1mm thick but you realy need 2mm or more to completly stop the rubbing and to many washer under the hex will cause the wheel hex to strip out so your best option is bigger hexes maybe $5-10 dollers
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Old 02-13-2019, 09:24 AM   #11
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Default Re: Servo rod end has damaged side wall. Rare? Solutions?

Quote:
Originally Posted by travis c. View Post
Put the tie rod below the knuckle arm and the drag link on the top.

If you do this just be aware that you will be changing the steering geometry. The drag link and pan hard bar should be roughly parallel to each other. By moving the outer end of the drag link down relative to the servo horn, aka pitman arm, you will induce bump steer in the steering. To compensate you will also need to space the inboard rod end down the same amount. Finally as a consequence the tie rod will now be lower and more vulnerable to potential impact damage.

IMO, the best way to offset the wheel back space is to use a wider wheel mount hex which will also widen the overall track width making the truck more stable.

Last edited by Inspector86; 02-13-2019 at 09:40 AM.
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Old 02-13-2019, 10:36 AM   #12
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Default Re: Servo rod end has damaged side wall. Rare? Solutions?

Thanks again, everyone. Just looking at the rims I have, and the offset, gonna take a wild guess and say that 90% of all those TRX4s out there got just a tad wider when their owners upgraded.
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Old 02-14-2019, 02:33 PM   #13
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Default Re: Servo rod end has damaged side wall. Rare? Solutions?

Maybe someone can explain why some of the hexes I see have -- don't know what you call it -- a shoulder (step?) to a slightly raised circular section.
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Old 02-14-2019, 03:17 PM   #14
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Default Re: Servo rod end has damaged side wall. Rare? Solutions?

Be sure you are looking at hexes for the SCX10ii and not the TRX4. They are different.
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Old 02-14-2019, 04:33 PM   #15
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Default Re: Servo rod end has damaged side wall. Rare? Solutions?

Yeah, thanks. I'm beginning to understand there's a lot of variables. Easy to order the wrong thing. No rush. I can still drive...everyday.


Quote:
Originally Posted by Inspector86 View Post
Be sure you are looking at hexes for the SCX10ii and not the TRX4. They are different.
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