I have refitted the 9398 LEGO Crawler with new tires.

The tires are "Absima 1:10 complete wheel + Crawler-rim black offroad V-block profile" (number 2500030)

3 of the 4 tires were factory glued to the rims, so I had to remove the rims somehow.

After reading some things on RC forums, I decided to use the "baking" method of removing them.

Baking the tires makes the glue that's used brittle; if done correctly, it will be pretty easy to remove the tires from the rims.

I preheated the oven to 175° Celcius (350° Fahrenheit) and put the tires+rims in for 6 minutes on a cookie sheet. After 6 minutes, I turned them over and left them in for another 6 minutes.

WARNING: if you want to do this, make sure to have sufficient ventilation in the house (open some doors) because the plastic rims will start smoking and smell bad !!!

After removing the tires from the oven, I let them cool as the plastic rim will be soft.

After a few minutes and after checking the plastic rim wasn't soft anymore, I applied pressure on the side of the tires close to the connection with the rim.

I heard the glue crack while applying the pressure and the tires came right of the rims. The rims were completely deformed, but I don't have any need for those anyway.

You SHOULD be able to save the rims by using a lower temperature and a longer cooking time (2x 7.5 minutes @ 160° Celcius / 300° Fahrenheit; your mileage may vary).

The foam inside the Absima tires was unaffected by the baking process. The tires themselves seem to be unaffected as well.

Even with the differentials on the 9398 LEGO Crawler it is now able to climb obstacles which were previously unattainable due to the fact that the LEGO tires are really not good enough for real crawling.