We've run our b44s outdoors on our 1/8 track a few times. It tears em up pretty quick if the track is dry or rutted. Chassis protector is a must and it will get beat to crap.

Having said that, they're a blast and they work great. You generally have to raise ride height a bit for the looser outdoor conditions. If the track is blue grooved hard and growing rocks, I don't generally do it. If it's got some moisture and has recently been prepped, why not?

Wayne