They are 26" generally, but there are new 27.5"+ (around 3" wide tires with basically a 29" diameter) coming out that could be seen as the next big thing... Mine has 4.6" wide tires on it currently, can run down to 2-3psi in snow/sand. I run them around 8-10psi on dirt and up to 20psi if just out doing some km's on gravel roads. You can get them single speed if you want, bugger that though, I have 20 gears to choose from!
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