looks to be in the .75 -.91 range. best i can guess with out some kind of referance next to it. could you ask the previous owner of the sled? also looks like the studs could be cleaned up or replaced.
Ya I think it looks like an Xtra-12. Red bogies would mean Ultra if it were stock, or Indy 500 EFI, but after looking at his avatar, I guess Ultra too!
Thats a factory Polaris track. Same profile that came on my Pro-X and most edge sleds. No bigger then 1" and no smaller then .91" If you look at some of the lugs you can see the Polaris star in them.
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