Yeah I heard that they get caked up with mud pretty easy, not to mention they don't self clean. You can tell just by looking at the tread pattern... no good.
I had'em on my 96 F-150 and they're pretty much usless both on and off road. They're like slicks on wet pavement and same goes for mud. The only thing they're good for is turning out of muddy ruts because of the large side lugs.
I agree that the Thornbird isn't the best tire out there, but it isn't a mud tire. The thornbird was introduced as Interco's version of an all-terrain tire. It sucks in most conditions, but so do all the other ATs on the market.
I don't like the Thornbirds and they would ride alot worse on pavement, but I'd trade a set of 32" Dayton A/Ts for a set of 33" TBs if given a chance.
I was going to pick up a set of them..but the good ole boys and girls from teh jeepz.com website turned me off...running mt/rs..talked to people that have thornbirds and they are just waiting to get new tires.
look at the tread pattern.... too much high area for not enough low area... they don't displace the mud properly... yeah, they may look pretty cool.. but i've learned to think they look stupid
if you could actually groove the birds, they could actually be nice tires... but.. every bird i've seen had very very shallow tread... not sure if they are like that from the factory, or if they just wear that fast
Stuckbird, thornturd, Stuckturd, whatever you want to call 'em, they're interco's big embarrassment. I don't think I've ever heard a good review on that tire. Very unlike that company to produce a real dud like that.