There's a 16" diameter Chevy car steering wheel on Ebay, but it's got angled spokes, not flat ones. That will reduce the diameter by a few inches, but it will also move the rim closer to you. Original equipment truck steering wheels are 19" in diameter.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!