68mm tire foam

[Ynad]

68 mm tires are the biggest I've seen, had to try them out on my new ripper.
As on all my minis I cut foams to the weight of the truck.
After trying out the soft foams I realised the lateral support doesn't exist but the conformity of the tire felt good. Now onto the good stuff, hard foams. They are useless as is for crawling. But they provide exelent sidewall support and room for modding.
I use cut outs from the telescoping antenna, various sizes can be made. Some electrical tape for grip and in a twist like motion back and forth holes are made easy.
Some horizontal cut through, some vertical.
Cut horizontal closer to the top to keep sidewall rigid.
Vertical may not be neccesary or more can be cut to make it softer.
I've cut asymmetric pattern, outer side has additional smaller diameter holes cut half way through to the vertical cut hole.
After testing the most successful version. The sidewall has a lot more support, outer side is very soft while the inner side helps tire from rolling sideways.
I've tested these on pins and the MT 68mm from DJ Crawler.
Personally I prefer MTs to pins. Pins roll sideways no matter what I tried.

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[Gramps]

I've tried cutting holes in foams with a whole punch which didn't work that well. Your homemade tool form a telescoping antenna is a great idea and it looks like it works well. I'll bet you could also put heat shrink on the end for a handle.

 

[Natedog]

Great idea for foam modding! Mini/micros really need more foam options, as you said the soft suck and roll under when steering especially on sidehills. Some nice firm foams that we can trim or hole punch as you've done to meet our needs is what we needs! I bought some larger mini tires just for the foams and they are better but not as firm as I want. Nice that ProLine has made dual stage available but only in one size and they are too small as aimed at stock-ish sized SCVX24 tires. CI foams that I saw on his site are also aimed at this tinier tiny tire sizes, won't really work in larger tires and TRX4M sized tires.

Agreed about tire tread too, I want scale realistic tires, not mini pins.

 

[Ynad]

DJ crawler pin tires do not go with injora easy. They will mount with foams on DJ crawler rims.
But to mount on injora foams need some cutting. Some light trim on the inside rim and it fits.
And then that happened. Ripped inner bead, possibly due to over tightening. I was able to mount them anyway.

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[TacoCrawler]

DJ crawler pin tires do not go with injora easy. They will mount with foams on DJ crawler rims.
But to mount on injora foams need some cutting. Some light trim on the inside rim and it fits.
And then that happened. Ripped inner bead, possibly due to over tightening. I was able to mount them anyway.

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I'm trying to understand what bead "ripped"
The tire's bead ?
Couldn't have something to do with that sharp edge of the inner wheel ?
And "cutting" ? when tightening as opposed to "ripping" ?
Likely could have been avoided had that inner wheel edge been sanded or file down some, and wasn't so sharp ?
Or just maybe just replace the wheel that was ground down to a sharp edge ? :idea:

 

[Ynad]

This happened to one of the tires. After mounting the foam pushed the rubber out and ripped out the inner "bead". Cutting foams inner rim will prevent that. It ripped most likely due to over tightening bolts.
Yes, to all of your suggestions.

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[Natedog]

Cut the bead off the tire, reminds me of my set of RC4WD macnined aluminum Raceline Monster 2.2s cut the bead right off my new set of Axial Ripsaws. Some tires and wheels are just not compatible and/or require tire bead trimming and very careful bolt tightening.