rockslide24
Newbie
This is one of the most helpful resourceful post/threads out there. Thank you
Rick
here is part of a review that Dirk did. not sure if it is on this server or not, but went back to the old one and just copy/pasted it.. but i thought there was more than this..owell :?
EDIT--yeah its here, but not sure if he ever did the 2nd part http://www.rccrawler.com/modules.ph...postorder=asc&highlight=ultimate+tire&start=0
Imex Jumbo Kongs:
The Kongs are, without a doubt, the largest and craziest tire you can put on any RC vehicle. But does bigger alway mean better? Sometimes! Out of the box, the Kongs are 4.5 inches wide and 8.5 inches tall. Way too wide for my tastes and it seems that anyone using them to crawl these days, feel the same and choose to narrow them to anywhere from 2 inches to 3.5 inches. I think we all know the benefits and how to narrow tires now and I won't get into it. My narrowed Kongs needed some type of foams in them due to the sidewall wanting to over flex onto itself. I use a tall, narrow foam to keep this from happening.
A narrowed Kong works well but suffers from a tall, smooth sidewall. I also added some lugs onto the sidewall of this tire giving incredible sidewall bite. It also helped lateral stability. The Kong gets nice bite from the tread, especially if you've cut some grooves into the large lugs. The lugs hurt and help this tire. They hurt because they are HUGE and the rubber compound making them up is not exactally gummy. They are hard enough to allow them to scrape and bump over ledges and rocks, rather than stick to them and pull the truck up. They also stiffen the tire up. They don't allow the tread to flex and wrap around rocks, which is another reason to cut a new tread pattern in the lugs. However, they help because they are spaced far enough apart (voids) that they tend to grab on some ledges and pull the truck over. In smooth faced rocks, such as River Rock, the harder rubber compound allows the tires to slip sideways off of rock, rather than clinging to them. They also tend to spin on the slicker surface of this type of rock. If the rubber compound of the Kongs lugs were stickier, they might be the ulitmate in traction.
As for the size: The Kongs are great on Xfactor width axles, where center diff clearance is much needed and I would not recommend the Kongs on Clod or TXT axles. The size is great when in very large boulder fields, as they can bash through and crawl over the biggest obsticals with no troubles. The down side is that they are large enough to be bulky and clumbsy. They are harder to turn than a smaller tire. They put more stress on the drive train and servos and the tall sidewall can get hung up in crevices, never to return!
The Kong is a good, solid tire. I would say there are more pros than cons but it's a close call. The Coolness factor of the Narrowed Kongs is of course, a big pro! But for serious competition, Cool doesn't always win the prizes. A big downside for some of us is the need to modify them. I spent quite a bit of time and dough to make the Kongs work well and I still wouldn't give them all "gold stars" for their performance.
Performance Test / Waterfall 1: I put all the tires on the same truck and attempted Waterfall 1 on my rock course. Many of you have beaten this obstical and know it ain't easy(except for Kaetwo)! The first part of it consists of smooth river rock and leads to a huge, steep waterfall. The Kongs breezed though due to their size but was not able to make it over the fall without 20+ attempts due to the hard rubber compound. It couldn't get the bite to crawl over. I finally was able to bash over at a higher speed and I got a lug to bite a sharp ledge, pulling the rig to the top. Test Score: B
Recommendations: Narrow to 3 inches, use narrowed and shortened foams, add side lugs, cut tread pattern to liking, sipe lugs, spray with WD40 weekly.
Possibilities: Use Big Joe or Hot Bodies (large) wheels. You can cut off the bead of the Kong and mount them onto a larger diameter rim that would reduce the size of the sidewall, making this a slightly more controllable tire.
Sharp Rocks(ledges, etc) B+
Smooth Rocks(river rock) C+
Steep Climbs in Rock B+
Dirt Crawling A
Mud and Rock B
Stability C+
Stickiness C-
Conformability B
Coolness Factor A+
Need to modify: MUST
Overall Crawlability of the Modified Kong: B QUOTE]
As I was reading through this, I thought to myself, jeeze I wish that someone would have put some ratings about the tires so I know what to buy, and what do you know you did a huge favor to me!!!! Thanks