Think that auction gone a bit crazy. I've just paid £65 for very clean set from a member on here and about £60 for one NOS one recently, I'll PM you as interested if your selling. Earlier tyres do/can go for more, paid £120 for set of NOS UG ground controls but they are super rare. All IMO this of course.
91 Yeti Ultimate / 91 Yeti ARC / 93 Yeti FRO / 95 Yeti ARC / 92 Fat Chance Yo Eddy / 93 Fat Chance Ti / 95 Indy Fab Moo Deluxe / 91 Kona Hei Hei / 92 Merlin Mountain / 89 Stumpjumper Team / 91 Specialized M2 Team / 92 Specialized Epic / 95 Specialized FSR