It is finally time to talk big tires.

The subject is all the rage these days, but we've been here for a while – riding our thick gravel tires on rigid drop bar bikes for years. Nevertheless, we are intrigued by a lot of what is coming to the discourse, especially some of the quantitative testing we are seeing from certain corners of the internet. Most notably, John Karrasch, a.k.a @flexfitbyjohn on Instagram.

The bike fitter, a turned-off-road rolling resistance guru, has refined a form of the Chung method for testing to objectively measure the rolling resistance of countless tires, posting comprehensible graphs that demonstrate the comparative value of each. Karrasch also has a Patreon where he goes deeper into the data and breaks down the nuances of the different traits of the tires he tests.

Now, he is a niche-expert who has become a legend in the small corner of the internet that is interested in going fast on gravel. He is also a frequent pen pal with the Rodeo Labs crew, so we had to have him on the podcast to really get into the nitty-gritty details.

If you want to learn more about John's testing, check out his Patreon account here.

Logan has also written some pretty detailed stories on the subject. Here is a story he did for Cycling Weekly on some of his favorite options.

Hosts: Logan Jones-Wilkins, Drew Van Kampen, Stephen Fitzgerald

Guest: John Karrasch

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