Originally Posted by scottyc
The Rubicon tires have an overall diameter of a hair over 32". The base X tires have an overall diamater of about 29.3". That's a difference of 2.7". Half of that would contribute to increased clearance. That's 1.35". The Jeep website lists 1.4". Seems reasonable to me.
I think your measurement is too conservative. I have the Ravine wheels with 30x9.5x15 on my 2004 TJ. I bought a 2005 Rubi Moab take-offs with 31" tires. When I stood the spare tire next to my 30", the 31" tire stood a full 3 inch taller than the 30" I have. This means 1.5" higher axle height. So, it could be more than 2.7 inch.
2009 JK Rubicon (Former Daily Driver); 2014 VW Jetta GLI Autobahn w NAV.
Auto, Power, Remote Start, Towing Package, MyGig Navigation with Lockpick, Rear View Camera, B&M 70268 Transmission Cooler, Aeroforce Interceptor, Valentine 1, Tub Sound-Deadened with Raamat and Ensolite, Hard Top Heat Insulated with 1/2" Styrofoam Insulation, Bilstein Shocks Front & Rear, PIAA Dual Horns, IPF 920H4 Headlights.
Protection: Skid Row Engine Skid, Lower Control Arm skid & Evaporator Skid; Rock Hard Gas Tank Skid; Warn Stainless Steel Differential Skid Front & Rear.
Recovery Gear: Warn 9.5Ti Winch, 11,000# Pull-Pal.
Communication: Uniden 520XL CB, Diesel External Speaker, 3' FireStik Whip.
Shrockworks Mid-width Front Bumper with Warn 9.5Ti Winch -- Ordered 7/17/2009; Bumper Received 12/4/2009.
1" Coil Spacer Front & 1/2" Coil Spacer Rear restored OEM Rake.
Moab - 4/2006, 5/2008, 4/2009, 5/2011, 4/2013
Ouray - 8/2007
Rubicon - 9/2008
Gone, but not forgotten: 2004 TJ, 1999 Audi A4, 1992 VW Jetta GL 5 Speed