Ever wanted to know the biggest tire you can safely run on any axle? How to calculate spring rates? What the torque yield is for every popular replacement axleshaft? How to re-gear for larger-than-stock rubber? Well, Four Wheeler’s Bible, 2nd Edition, by longtime Four Wheeler contributor Jim Allen, answers those questions---and a whole lot more---in authoritative detail. Spanning 256 full-color pages, this Bible has got the gospel on everything from basic off-pavement driving skills, to map reading and orienteering, to advanced winching techniques, with hundreds of mathematical and geometric formulas and diagrams included to increase your wrenching IQ. Whether you’ve been wheeling for decades or you’re just starting out, there’s something of interest in here for every wheeler, with hundreds of photos and illustrations to boot. It’s available online from Amazon and other e-tailers, or via Motorbooks Workshop at www.motorbooks.com.