Literally the same day I shared that we’d be getting a set of the new Cooper Discoverer STT Pro tires for the 4Runner, I came home to a pile of fresh rubber waiting for me on the front porch (I’m sure the FedEx guy loves me…). Since then, we’ve wasted no time getting them mounted up and on truck, and we’ve already gotten a few insights on them from the install and handful of miles we’ve accumulated so far.
Initial Inspection + Install
Visually, the STT Pro’s look all business, with deep tread blocks, siping, sidewall biters, and scoops built into the tread blocks for mud traction. There is no mistaking this tire for anything but a serious off-road tire worthy of the most capable modern 4x4s.
One of the first things I did with the STT Pro’s was throw them on a scale to see how much they weighed since I had not seen any published specs from Cooper. In the 285/70/17 size that I’m running, these tires checked in at 60.6-61.9 lbs each, so a ~2.1% max variance, some of which might be attributable to the scale. As an aggressive load-range E tire, these STT Pro’s are coming in slightly heavier than the 58lb (published weight) Load-range D Goodyear MT/R’s that I am replacing.
Installing the Cooper STT Pro’s was no better (nor worse) than any other mud terrain tire. The tires are perfectly in-round and all 5 were easily balanced, however 2 of the 5 tires required more than 10 ounces of weight to get them into spec.
On-Road Initial Impressions
The first thing that hits you about the STT Pro’s is that they are QUIET compared to the MT/R’s. At a steady 50 mph (on the same stretch of road), I recorded a 10 decibel difference between the STT Pro’s and the MT/Rs. That’s pretty huge. I will say that the MT/R’s have gotten louder towards the end of their useful life, but they were never close to being as quiet as the STT Pro’s.
In terms of handling, the 4Runner tracks straight over road imperfections with the new tires and there are no unusual vibrations at highway speeds (which is something I experienced on the MT/R’s early on, before they “wore in”).
So far, with very limited experience, these STT Pro’s are checking all of the boxes. Now we just need to get them off the asphalt down to trail tire pressures and see how all of the innovative elements of these tires perform in the real (off-road) world!
More to come!