My current tire size: P225/75R16
I like the tall, narrow tire look on the RRC. A tire with added sidewall support to allow for tire deflation when off road would be nice. The BFG AT 235/85R16 looks good, but I might lean towards a 225 or a 215 width. Costco has a good deal on BFG All Terrain TA KO2 LT235/85R16 for $174.99.
Likely the best resource for RRC tire information: http://www.rangerovers.net/outfitting/tires/classictires.html
From RangeRovers.net: "215/85 R16 This size requires no body, suspension or even steering stop modifications. Interestingly, dimensions are almost identical to the 700-16's used on Camel Trophy vehicles for many years, and the width is similar to the stock Range Rover tires. It yields close to an inch of extra static clearance under the diffs, with a slight gearing penalty of 3-4% at highway speeds."
Discovery 1 tire sizes are similar to those of the Range Rover Classic.
Discovery I 94-99 <29" 205/80/16: Stock size in other countries. same height as 235/70-16. 235/70/16: Stock tire size. 255/65/16: same height as stock but wider 225/75/16: same height as stock but narrower 245/70/16: a little taller and wider than the stock size 30"-31" 255/70/16: slightly taller and wider than stock, but still fits with no lift. 245/75/16: fits on stock height but popular size for 2" lifts. some trimming on the rear wheel well and adjustment on the steering stops. 215/85/16: same height as 245/75/16 but narrower. 265/70/16: about as tall as 245/75/16 but wider. 32" 265/75/16: Same as stock Defender tires. Will require some more trimming. lift highly recommended. 235/85/16: same height as 265/75/16 but narrower. 33" 255/85/16: about 33". a lot more trimming required and you should consider upgrading to hd axles. 285/75/16: also about 33" but wider. a lot more trimming required and you should consider upgrading to hd axles. offset whdeels recommended.