Well, we have these dirt hills by us that is excess dirt from a road construction project. The rain has washed it down really good, but when the truck got on steep climbs it just dug into the sandy terrain with the stock tires. So we installed RC4WD Mudslingers on some wheels I 3d printed.
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Since installing the RC4WD Mudslingers it walks right up the hill. They are also great over rocks and everything else we have thrown at it. But the body will have to be trimmed a bit. I took about 3/8" out of the back of the front wheel opening and just cut past the lip around the top. But I do have +5mm extended hubs, so my tires swing a bigger arc when I turn full tilt. The rear wheels are fine, but cose to rubbing in the front of the wheel opening.
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This was before trimming, but not at full travel. If the rear right corner is up, it hit the fender lip just barely, so I took off about 1/8" across the top.
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Just know if you buy new tires, you need to grab some wheels. The OEM tires are glued on pretty good. You can get the wheels and tires from Tower Hobbies pretty cheap.
Axial Machete wheels ($4.99):
https://www.towerhobbies.com/product/124-kmc-machete-1.0-wheels-7mm-hex-4/AXI31615.html
RC4WD tires and wheels:
https://www.towerhobbies.com/rc4wd/...eelDia&prefv1=1.0+in&srule=best-matches&sz=24
If you buy the Mudslingers, they are sold in packs of 2 for $8.99. So you need to buy two of them
The RC4WD Wagon wheels (stamped steel ones) are pretty cool because you can flip them around and get a bigger wheel offset. They are fairly cheap too. I have them in 1.55" for a 1/10 trailer build and they are nice.