It's a special bonus holiday episode of the Carmudgeon Show! The boys meant to do an episode teaching you everything you need to know about tires. 

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The tire conversation lead to fun experiences involving different brands — and Derek discovering Rallycross, which is like autocross, but filthy.

Jason has lots of experience pushing different tires to the limit — and Michelins seem to hold up to whatever he throws at them. Pirellis? Less so. The biggest surprise lately is Vredestein Tires, which Jason has been experiencing recently.

A Bridgestone fan for years, Jason recently placed third overall in a 24 Hours of Lemons race using Bridgestone's new Potenza RE-71RS. They wore well, but gripped fantastically in the dry and (especially) in the wet.

Things the boys discussed: what to know about tire size, ratings, and categories. Pirelli CN36s look great, but are they better than Michelin's XWS repops, manufactured by Coker?

And what's with Jason's Hankook experience? Who is Petlas? Why is Dunlop's Direzza ZII great, and why can't Yokohama make a round s.Drive?

Also — some discussion of efficiency on Jason's Volkswagen e-Golf, which dropped by nearly 40% after switching from the factory Bridgestones to larger, far more aggressive Michelin Pilot Sport 4S. The plan is to try out Vredestein Quatracs over the rainy season to see if he can get some range back.

Don't forget — the only thing touching the ground is your tires. Choose appropriately!Learn more about your ad choices. Visit megaphone.fm/adchoices