I just finished installing a set off asx vampires on the back of my MaxIV, and then testing them in my pond. Man those tires are wide! About 13 1/2 inches and close to 14. If you will look at the second picture you find tracks from my max up the side of an area I have never been able to pull out of with any other tire combo I have run. This area is slick with mud and leaves you have to be on all fours to walk up or down it. Third picture. Right side is my normal enter and exit point. Left side almost steep enough to flip the max backward and I pulled right out of the pond hanging on for dear life and wishing I hadn't even tried half way up but the max pulled me up and out. Wow! Does this baby climb!!! If swim speed is important don't go with this combo I am guessing 1 to 1 1/2 mph water speed. The max is running beatiful now and is very, very, impressive with the lower gears and red spring clutch. Pulling power is woowwww! Hope to have everything ready for Busco beach and hope to have a second set of the new Argo tires for Busco. Maybe Robbie, Lewis, and I can have a water speed race to see which tire and machine combo swims best! Can't wait!