From this site, if it helps:http://www.ebay.com/gds/Jeep-Wrangler-CJ-Tire-and-Wheel-Advisor-/10000000009592654/g.html
An “average” 33 inch tire weighs about 55 pounds. A stock 225/75-15 tire weighs 28 pounds. Aftermarket steel wheels are usually heavier and stronger than the stock wheels. In averaging a few aftermarket 15x10 inch steel wheels, we’ll use 26 pounds as a number versus about 16 for the stock wheel. So, where the stock wheel and tire combo weighed 44 pounds, a 33 on a 15x10 steel is 81 pounds. An “average” cast alloy wheel (forged are a bit lighter) come in at 16 pounds, dropping the upgraded tire and wheel back down to 71 pounds.