Rad Runner 2 downgraded to single wall rims.

[Radio Runner]

In the parts list for the RR2 if your paying attention you will notice that the rims are no longer listed as Double Wall. This is one of the sneaky ways to cut cost that most customers never see since the tire hides it.

Single wall rims are weaker and cheaper. The RRplus is still listed with double wall but keep and eye out for more cost cuts like this in all models.