QuoteFor the speeds and weight the bike can handle, it should have 1.5-inch slicks for tires. Instead, to reduce friction, Whittingham and his bike designer, George Georgiev, use 7/8-of-an-inch wheelchair racing slicks. As if that werent enough, the duo wanted to inflate the tires as hard as they dared, so they inflated a bunch of the tires until they burst. "The tire is recommended to a PSI of 115; most of the tires we tested blew at 240, so, we ride them at 150," Whittingham says laughing at the extremeness of it all.