I recently ordered a set of 32" Roctane XD’s on HD5 wheels. I went with same size all around on my xp1k so I could carry a matching spare. Per STI spec that combo should be about 58lbs per wheel. I was pretty shocked when it actually came to 70 lbs! The STI site show 43 lbs and my tire is weighing in at 55 lbs. I’m not racing and this is a rock crawler tire but weight was a factor in my decision and although I expected some variance 12 lbs is huge. Now I’m even more concerned about the axles so upgrading those ahead of my next trip. My spare was also far too heavy for the Isota box I just bought. At 58 lbs I expected to lift the lid a bit but Isota said a 32 would fit but once I got it on there it really was just too big and heavy so I had to swap it to a smaller lighter 30". I contacted STI and they provided the response below and thought I should share it here.

Thank you for letting us know about the weight issue. We went to the warehouse and weighed the 3 largest sizes of the Roctane XD tires and found the following:

28×10-14 37.3 pounds
30×10-14 42.4 pounds
32×10-14 53.3 pounds

The weights in our spec sheet are the original weights when the Roctane tires were first released about 3 years ago. After receiving your e-mail and weighing the current production tires we asked our tire engineers for an explanation We had some leaking issues with some of the first production runs and the tire engineers have made many spec changes to the tires to correct the problems. The added more rubber to the tire construction to make the tire more durable, puncture resistant and longer lasting. We did not realize how much weight had been added over the past 3 years. The good news is that we have a much better tire now, bad news is that is heavier. The weights listed above are the current weights. We will change the information on our web site to match. Thank you for bringing this to our attention and sorry for the inconvenience.