Does anyone know what these wheels are called?

I bought these from a guy on Craigslist for real cheap and he told me they were off a 2005 Big Dig Chopper... I've never seen these on any Big Dog ever so I'm trying to find out what they are. They have blades that are detachable and I personally like them better without the blades... Thanks!00A0A_jKuJoSSoXkB_1200x900.jpg 00202_h6t5BvxSrFs_1200x900.jpg
 

SKOGDOG

One of the old ones.
I like the wheels....but never have seen any like that on a Big Dog. The back wheel looks a little wide for a 250 tire. How many inches across is that back rim? Doesn't the 250 tire call for an 8.5" rim, and the 300 a 10.5". Hard to tell from the photo.
 
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