Cooper ATT

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#Cooper #Discoverer #ATT (2.3 ATM) - Hi all, we had the privilege to start testing the new Cooper ATTs. Our colleagues pressured us to release a video so I only had 3 days of solo testing. The overall testing will continue in the next 3-4 months, versus included, so stay tuned. At the end of the video you will also find the first AT chart temporary grades for this new tire. Some grades are purely speculative from design analysis experience, as we had not tested yet the mud, snow, etc.
The tire impressed me with its fuel consumption, in city and outside I had around 1 liter in fuel consumption gain, it is also exceptionally quiet, medium priced summer tire levels. It has no vibrations at high speeds and keeps a good stable road direction (when you reduce hand input). Lateral grip is insanely good and this will not only be an asset on asphalt but in off-road especially when you have to Spiderman your car, driving at high speed on gravel or to avoid lateral slides on inclined hills.
On the off-road dust, gravel and dry grass the tires performed well. I would say that grass and gravel are the first surfaces to be traded off for high speed on asphalt features. As on any tire, it is all about balance and trade-offs. For a tire that is manufactured in China, it shows how much they have advanced with western help. We are biased against Chinese made tires, but in this case, we didn’t find anything to complain… yet!
Compared with AT34S, you have 10-15%: less traction, stopping power but the tires are significant less fuel consumption, less noise and a bit more lateral grip. We also suspect that the ATT will perform better in mud than the grades we listed. More testing will come for the ATTs, for now though they have our appreciation for their price versus performance offer.
Photo details explained:
1. Interesting X like Sipe, an unusual design for the edge blocks. Design to offer resistance, control and stability at high speeds turns.
2. Whisper grooves, split this time, they provide a sound barrier. Don’t worry for water elimination, that’s not lateral here but behind the tire.
3. Stone ejector ledges and engineered groove shapes. They also prevent the blocks from being ripped-of or getting deep splits.
4. Cut block edges to prevent damage ruptures. This also helps with the mud release.
5. Asynchronous central aquavac channels, for netter mud and snow traction. Similar edges to 4 but doubled down in 2 parts for surface higher risk of the block.
6. Inclined block external edges to allow faster mud release and a higher water evacuation volume.
7. Small overlapped central block column interlock, this ensures a quitter ride and constant traction control performance at high speed.
8. High Silica content compound, summer biased chemically. Provides decent cut and good chip performance and best-in-class tread wear and traction. We expect ATT to be chemically a bit stronger than 4S.
9. Also 10 – same block edge cut, this will allow for faster mud release, especially mud mixed with grass.
11. Lateral block enhancements and surface enlargement for better lateral protection and grip in direction changes in off-road.
12. Small shoulder size differences, for lateral grip. They are smaller than usual on other ATs to ensure high speed direction change stability.
13. Deep vertical lateral sipes. A small overkill design feature that shows the fact that the tire was tested and designed with the help of machine learning. You can see things that only an AI will do.
14. Extra lateral protection for high spin in rocks.
15. Grip and structural small lines, for lateral low speed rocks grip.
16. Raised curb bars, designed to give extra protection in going over rocks and spinning the rites while also in a tight direction turn.

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Second Testing Session - #Cooper #Discoverer #ATT
Unfortunately we didn’t have any deep mud due to the previous drought even if we are testing after a full day of rain (yesterday). For the conclusions please pause the video at the end.
ATT at 1.8 ATM is a more than decent AT tire even if its summer biased compared with the impressive AT3 4S four seasons performance. We tested at 10 degrees Celsius, so it was a bit cold outside.
We will continue with the tests and hopefully we can find someone in the group who still has BFGs KO2s installed. We have two but they were busy, the rest has almost all went for winter tires or are on AT3 4S.
For this particular scenario where the ground is hard with dry-butter type mud and strong dry grass layer, the KO2’s design would have had a bit more problems than the ATT due to the fact that it would have not been able to dig deep. Still, we need to see this in testing, so stay tuned this Autumn for more versus.

Text Update - Interesting mentions:
1. The fact that if the rear wheels are on the earth-stair, then the car climbs much easier compared with if the rear wheels are directly above on the ramp. Most likely, the engine requires less effort to cope with the back wheels and and thus all 4 wheels have a greater margin for traction deployment until the grip is lost. Having more time to move the car and get into optimum traction looks like a good thing, otherwise it risks coping too fast with the car weight when the breaks are released on the ramp and they start skating/spinning on the spot.
2. The fact that on the same ramp you can spin-slide or climb depending on the pressure in the tires or due to the the traction-grip from a little more inertia, helps with identifying more easily the design differences between the tires.
3. The steps/stairs of the ramp help to reduce car speed-inertia and force the tires to lose their grip if you have too much speed (the front will bump too high), so this result will force the drivers normalize speeds much more than more than on simpler ramps.
NOTE: The video editing and the analysis work, takes almost twice as long as the tests themselves. Please then don't forget to share the video if you want to motivate such community efforts. Thank you.