Kronos XTR Used Kronos XTR - Any Diff Issues

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Jeo79

Jeo79

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Corally RC's
  1. Muraco
Thinking of jumping back onto another Corally and will potentially be picking up a Kronos XTR. Trying to keep costs low so wondering does the XTR need the alloy bulk heads/gear boxes out the gate? Are there any known issues with diffs stripping on the XTR?
 
No they pretty solid out the box my xtr probably my most reliable rig , I’ve upgraded mine just for the style points.

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Nelson.81 said:
No they pretty solid out the box my xtr probably my most reliable rig , I’ve upgraded mine just for the style points.

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Yea this is simply a work of art mate!!! Wow looks like a proper basher truggy!!! I heat mixed thoughts on the plastic diff cases so thanks

Partydaz said:
Check and make sure the diffs are shimmed and the diff bearings are good and it should be next to bullet proof 😃
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Cheers for coming back mate.... good to know thanks
 
Jeo79 said:
Yea this is simply a work of art mate!!! Wow looks like a proper basher truggy!!! I heat mixed thoughts on the plastic diff cases so thanks


Cheers for coming back mate.... good to know thanks
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Thanks, Nothings indestructible but upgrade options if need or want for it. Corally 7075, vitavon or even adu diff cases

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Nelson's builds are without compromise.

Mine chop and change a bit, depending what I'm trying to do.

Differentials are solid, but the little red O-rings are fragile. They have a tendency to look like this:

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That groove shouldn't be there. When they look like that 👆, they leak through the output. Very easy fix though....

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Just make sure they aren't deformed when you fit them - and use green slime. Seals them up 100% and protects the O-rings. 👍

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Enjoy! The XTR is the best handling truck out of my holy trinity and it's far from fragile. 😎
 
danl said:
Since they are silicone, tend to swell over time. Buna N o rings don’t swell in contact with silicone diff oil.

https://www.rocketseals.com/chemical-compatibilities/
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Interesting - another member here was stating the same.

However, most RC companies still use silicone o-rings for shocks and diffs which are filled with silicone.

Buna-N (nitrile) and silicone O-rings are both used in RC car shocks, but they have different strengths. Buna-N offers low friction and great wear resistance for smooth action, while silicone provides stable sealing across a wide temperature range and does not swell when exposed to standard silicone shock oils.

Buna-N O-Rings
  • Low friction: Moves very smoothly against the shock shaft.
  • Tough build: Resists tears and normal wear very well.
  • Oil interaction: Can swell slightly over time when soaked in silicone shock oil, which tightens the seal.

Silicone O-Rings
  • Stable size: Does not swell or change shape in silicone shock oil.
  • Soft feel: Extremely plush, but can create slightly more drag on the shaft.
  • Temperature steady: Works well in hot or cold weather without getting stiff.

Quick Comparison
  • Best for smooth action: Buna-N (less initial drag).
  • Best for zero oil swelling: Silicone (stays true to size).
I've yet to try Buna N. Zero oil swelling according to Gemini seems counterintuitive, because its the slight swelling which ensures the oil tight seal in our diffs and shocks.

Jury's out......
 
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