My guess is the tire is almost 2 years old, the purple writing is active run data...photo 1 car location and set #photo 2 tire surface temps, air pressure depending on track surface and banking appears to be good ot fair. Middle number being higher shows slight over inflation(?)photo 4 86 inches=tire circumference, which is a short 27.5 inch tire, which may explain the middle number in photo #2. we've all heard the phrase "an air pressure adjustment".It is not a short track tire... cool swing, and a neat post...it will be interesting to see how many cross over (cars/bikes) folks are out there....where do I pick up my tickets and travel arrangements for the Sonoma race...LOL!!!!!!!!!
Goodyear code D4148 is from the Nationwide series and could have been run at a few different tracks during the 2008-09 seasons.http://www.jayski.com/next/2009/23mis2009.htm#goodyearMichigan International SpeedwayNationwide Series Tire Codes: Left-side -- D-4134; Right-side -- D-4148 Nationwide Series teams will be running the same combination of left- and right-side tire codes they ran at Kentucky in June . . . they also ran this tire set-up at Michigan and Kentcky last season . . . teams in the Nationwide Series should be especially familiar with this left-side tire, having run it 12 times between 2008 and 2009 . . .
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