Roy RitchieAutomobile and Driver
• We examined a Rivian R1T in November 2021 that went 220 miles in our 75-mph highway-range check.
• Lately, we ran a second R1T, this one on 22-inch avenue tires versus the all-terrain tires on the earlier truck, and it did 280 miles in the identical check.
• That’s a achieve of practically 30 p.c, and one other reminder of how necessary tires are relating to EV vary, in addition to to different efficiency metrics.
Welcome to Automobile and Driver’s Testing Hub, the place we zoom in on the check numbers. We have been pushing automobiles to their limits since 1956 to supply goal knowledge to bolster our subjective impressions (you’ll be able to see how we check right here).
In case you wanted one other reminder concerning the significance of tires, right here’s one with an EV-focused wrinkle: vary. A Rivian R1T carrying 22-inch all-season tires went 60 miles farther in our 75-mph vary check (280 miles) than a earlier R1T on the 20-inch all-terrain-tire choice. We have lengthy appreciated that tires are one of many single largest components relating to numerous efficiency metrics (braking, cornering, acceleration), however EV vary is unquestionably on that record, too.
We examined our first R1T in November 2021, the place it went 220 miles in our 75-mph highway-range check. That was a Launch Version and carrying 20-inch Pirelli Scorpion All Terrain Plus tires. Lately, we ran a second R1T, additionally a Launch Version, shod with 22-inch Pirelli Scorpion Zero All Seasons, and have been shocked when it went 280 miles, practically 30-percent additional. After all there are at all times different variables, however the tires appear to be the massive one on this case. If something, we might have thought the 85-degree temperature throughout this most up-to-date check would harm the vary versus the 57-degree day for the sooner run. As at all times, we set the local weather management to 72 levels in its auto setting throughout each vary check. This newest R1T was additionally 137 kilos lighter, at 7036 kilos complete.
It is considerably complicated that regardless of which of the three tire choices it’s carrying, each R1T with the quad-motor and huge battery pack (128.9 kWh) will get the identical 314-mile EPA vary determine on their window sticker, despite the fact that the 21-inch wheel-and-tire configuration is the one used for EPA testing. On its vehicle-configurator web site, Rivian means that the 20-inch all-terrain tires will scale back vary by 40 miles and that the 22-inch choice will drop the vary by 21 miles. That implies the distinction between the 20s and 22s on our two check automobiles needs to be 19 miles. However that can also be seemingly assuming the decrease pace EPA check cycles, and never our fixed 75-mph freeway pace.
Rivian isn’t alone, nonetheless, as most automakers have a tendency to make use of the identical fuel-economy and vary figures throughout a model line with the identical powertrain, despite the fact that there is likely to be two or three completely different tire choices that would trigger sizeable real-world consumption and vary variations. Tesla is the uncommon exception, going by the time-consuming and really costly course of to supply separate EPA rankings for every wheel and tire mixture on its automobiles.
This newest check additionally confirmed the extra conventional significance of tires; whereas braking was all however an identical, we noticed notable enhancements in most cornering grip (0.84 g versus 0.80 g) and acceleration. The dash to 60 mph dropped to three.0 seconds flat (a 0.3-second enchancment) and the quarter-mile to 11.5 seconds (a 0.4-second enchancment), additional cementing the R1T’s standing because the quickest pickup we’ve ever examined.