New Cooper STT Pro

[ECHO]

very sexy!!!

[Jus Jim]

A before and some after shots. Added Bushwackers, Level 8 Trackers 17x8.5 4.5 BS and the Cooper Stt Pro 315/70/17. I'm only running a Teraflex Performance Level Kit so I also had to trim the pinch seam and rock rails. The cheesy plastic airdam on front needed a little tweak at full lock.

[Jus Jim]

Additional info. 315/70/17s came to me from Discount at 36 psi. Measured 34.5 as received. Mounted on the Jeep they measure just a hair over 34. (I have stock bumpers, no winch and rear seat removed for weight reference)
Even though these are an E load tire I left them at 36 (same as my old tires, Kenda Klever Mt stock diameter C load) so I could do a straight comparison on the same daily driving route.
Initial impressions:
They seem to ignore the smaller bumps that the smaller tires would "feel".
On larger bumps they are pretty much the same as the old tires.
Noise. They have a hum which is definitely less than the old tires but I would expect it to increase with wear. Any radio on at all and it's gone. (I'm so used to the hum I never really pay attention anyway)
Going to the larger / heavier tire I noticed a bit of a power loss. Not huge and a flat lander wouldn't notice at all. I just used the procal last night so have not driven with that adjustment yet.
Summary of on road driving. I'm happy with the on road results, you might expect a response like "these things ride like bricks and beat my molars out". Not a significant difference between these and my old tires so I consider that a big win. Once I know I have the procal dialed in I'll drive a couple tanks of gas and give a MPG feedback.

[carlos1]

Those tires look aggressive. How's their performance off the road?

[Discount Tire]

Additional info. 315/70/17s came to me from Discount at 36 psi. Measured 34.5 as received. Mounted on the Jeep they measure just a hair over 34. (I have stock bumpers, no winch and rear seat removed for weight reference)
Even though these are an E load tire I left them at 36 (same as my old tires, Kenda Klever Mt stock diameter C load) so I could do a straight comparison on the same daily driving route.
Initial impressions:
They seem to ignore the smaller bumps that the smaller tires would "feel".
On larger bumps they are pretty much the same as the old tires.
Noise. They have a hum which is definitely less than the old tires but I would expect it to increase with wear. Any radio on at all and it's gone. (I'm so used to the hum I never really pay attention anyway)
Going to the larger / heavier tire I noticed a bit of a power loss. Not huge and a flat lander wouldn't notice at all. I just used the procal last night so have not driven with that adjustment yet.
Summary of on road driving. I'm happy with the on road results, you might expect a response like "these things ride like bricks and beat my molars out". Not a significant difference between these and my old tires so I consider that a big win. Once I know I have the procal dialed in I'll drive a couple tanks of gas and give a MPG feedback.

Thanks for taking the time to post your detailed opinion.

[Jus Jim]

hoping to hit a trail in the next week or two.

[Jus Jim]

I'd like to add that the service from Discount Tire Direct was excellent. Only took a couple days for them to come in. They were all in fine condition and ready to mount.

[Discount Tire]

Thanks for the kind words, Jus Jim.

[CJ7nvrstk]

At this point it looks like the best price for these in 37x12.50-17 is thru tread depot, even with having to pay for shipping.

[Jus Jim]

Gave them a pretty good workout over the weekend. Still happy. Hit some pretty sloppy muddy spots, some nice inclines and a few rocks with no issues.