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The wheels must have been a little bigger than 17 inches, since (62/12) * (62/12) * 17 = 453.8

Massive gear. I wonder if anyone could get that moving from a standing start. A huge 1km TT rider maybe?

Don't forget about π, with it you get 18.3 wheels. No problem with really fat tires, I think.

When I read this I thought, what is n? You mean pi, right?

Yes, 18.3 inch wheel is what I got. Here in the UK, the "wheel" size includes the tire as well, I think.

I guess if the rim is 17 inch diameter then 18.3 is only a tire width of 0.65, which isn't very fat.