Foam or air????

[merlcrawl]

im running air it seems to grip alrite, just wondering if i would be better off with foam

[Jesse Robbers]

Only air in the tires for r/c tires 'shouldn't be the 'best' setup. You may have decent vertical support but with a lot more bounce than inserts and vent holes in the rim/tire give but only air will have a lot less sidewall/sidehill support. Then having equal air pressure would be difficult to achieve and air pressure will change with the ambient temp and if/how long the tires are exposed to heat/sunlight.

[merlcrawl]

Originally Posted by Jesse Robbers

Only air in the tires for r/c tires 'shouldn't be the 'best' setup. You may have decent vertical support but with a lot more bounce than inserts and vent holes in the rim/tire give but only air will have a lot less sidewall/sidehill support. Then having equal air pressure would be difficult to achieve and air pressure will change with the ambient temp and if/how long the tires are exposed to heat/sunlight.

what if you just drilled two 1/4" holes in each side of the rim??

[TURTLE]

Originally Posted by merlcrawl

just wondering if i would be better off with foam

Yes, yes you would.

[e-hills4x4]

Originally Posted by merlcrawl

what if you just drilled two 1/4" holes in each side of the rim??

you could do that but put foam in your tires when you do. otherwise you will have no support at all

[Sverref]

had a HBX 1/8 scale crawler once and with the stock wheels it was best suited to have foams out and vented rims:p the wheels where stupendously hard but no foam and venting they did kinda good :p (moab lookalikes)

[the3kid]

I would run foam and either star cut it, get soft, or memory foam. I have a custom set of 40 axial bead locks with a tire valve in them to air them up and I must say they look cool, but don't have any grip and bounce like a son of a b$%#h....lol Might be fun on a clod set up to make it look like a real monster truck....then you can slap wheelie all you want....lol

[TURTLE]

Pesonally, there are better cut patterns then the star.
Try a horse shoe. or different foams sandwiched together.

[Big Mike]

Air ain't gonna work, it makes the tires too bouncy.

Which is why 1:1 4x4 guys "air down" before heading off-road.

Memory foam works the best for me, no star-cutting or any other mods are needed. Just stuff 'em in and roll...

[NeXt559]

Originally Posted by TURTLE

Pesonally, there are better cut patterns then the star...

people still cut their foams !?

come on people welcome to 2009 the age of memory foam, dual stage foam, hybrid foam, and adjustable foams.

[TURTLE]

Originally Posted by NeXt559

people still cut their foams !?

come on people welcome to 2009 the age of memory foam, dual stage foam, hybrid foam, and adjustable foams.

Sometimes cutting is a pretty worth while management of materials and money, plus I dont like memory foams, they very to much based on temperature.

[KBrog]

I've ran the G-made air tires on my 2.2 scale truck. I listened to the, more bounce, and sidewall theorys. I ran the tires at "0" pressure, in other words I would pull the plug, then put it back in before running. Bounce comes from shock set-up more than tires. Its a shocks job to control bounce. If your rig has to much bounce, look at your shocks The only thing the tires did different than tires with foam was, rocking from side to side. If turing and hitting the throttle then letting off real fast would make the tire roll then unroll with a small rock back and forth. It would help sometimes, other times not so much.

[merlcrawl]

Originally Posted by Big Mike

Air ain't gonna work, it makes the tires too bouncy.

Which is why 1:1 4x4 guys "air down" before heading off-road.

Memory foam works the best for me, no star-cutting or any other mods are needed. Just stuff 'em in and roll...

ya thats what i was going on 1:1 scale, thats why i was thinking of drilling holes in the tires so the tires would always be equal pressure??
im running the IMEX all terrain's their 5.5's thinking of going smaller because it seemed that the lizards were a little better

[crawl rookie]

Originally Posted by merlcrawl

im running air it seems to grip alrite, just wondering if i would be better off with foam

This was discussed more than a million time, dont newbies get smarter in time

[merlcrawl]

Originally Posted by crawl rookie

This was discussed more than a million time, dont newbies get smarter in time

dont you have better things to do than critisize someone? I hope you feel good about yourself for making that statement. Theirs simply no point in being on this sight if ur gunna be a sour ass every time somone asks a question. If people minded ansering questions like this they shouldnt reply.

[Jeepial]

Just go buy some Nova's Ark 2 stage foams and be set!!You don't need anything else in your tires..

[Doggy419]

1:1 crawlers air down so the tire will wrap around the rock and grip. i've been running no foam in my chisel's with a bone stock losi mrc and it's crawling terrain it couldn't with factory tire's. yes i know factory is always the cheapest set up. still seems like everybody suggests memory foam tho. maybe i should put it in and try?

[merlcrawl]

Originally Posted by Doggy419

1:1 crawlers air down so the tire will wrap around the rock and grip. i've been running no foam in my chisel's with a bone stock losi mrc and it's crawling terrain it couldn't with factory tire's. yes i know factory is always the cheapest set up. still seems like everybody suggests memory foam tho. maybe i should put it in and try?

ya it is better, i was running air for a year and a half and i finally switched to the stock foam and it gets rid of alot of wheel bounce (mainly suspension tho is wheel bounce prob.) and it seems to give a nice soft low senter of gravity instead of a light hopp at low speeds when trieng to crawl vertical.

[Rockfrog]

1:1's air down to increase contact patch, reduce hop, help prevent bruising (tires), and augment the suspension (ties in with wheel hop).
With r/c's jut air creates more wheel hop/bounce than most setups can handle. Then you get severe bounce affecting the rig as a whole. Think of this ... a highly tuned stadium truck supension handles washboards really well, but doesn't crawl worth a crap, it's just too reponsive, stiff by our standards, and 'twitchy' ... coversely a crawler suspension would tend to 'lock out' when faced with high speed washboards (the same mvement as excessive wheel hop produces). Further, wheel hop on an incline produces movement perpendicular to the suspension ... all but eliminating it's damping effects.
A crawler tire is simple too soft to run vented without foams, it can be done but with the tire collapsing and folding, control is unpredicatbale at best.
Foams are there to give similar effect of and aired down tire on 1:1 ... just enough to supprt the rig yet low enough to allow full contact and confomity with control.

Just my thoughts/opinions on the matter ... take it for what it's worth

[Doggy419]

Well i put the mem. foam in. the tires just don't wrap the rocks and grip. With my field rock pile i don't get enough speed to wheel hop unless i'm jammed(gotta slow crawl my pile). Thinking about cutting the mem. foam down some, well alot, those prolines really send the foam.