Other than physical damage, it is probably the compound you are using. Color varies from manufacturer to manufacturer so you can use the color to know which load wheel you are using.

I suspect the "white cushothane xl" is the Superior XL compound with a 97A durometer (hardness). If you are using a cushothane ez (red), this the XL will outperform the EZ in high speed, long runs. They also make a XL AC which is even better for high speed long runs.

Alternatively, Stellana makes a very good wheel called the Lmax. My customer prefer this for most applications.

If you know the part number (SKU) we can confirm this information. Reach us at [email address removed] and we will provide you some options.

Thanks,
Bill

Best check the alignment of your baselegs since it appears one may be bent. If you don't have impact monitoring, operators rarely "self report" impact incidents. Some aftermarket load wheel manufacturers used steel as the core of their products. Better OEMs are using cast iron at a higher cost but are more resistant to bond separation caused by heat build-up.

Check outriggers, measure inside at mast then at wheels I'm guessing they are bent in causing
Tires to run at slight angle causing heat

Try using solid teflon wheels. Don't think they are available in the market. You have to make them. Hope this help.