Rivian is working on a mid-cycle refresh for its flagship R1S SUV and R1T pickup, and one of the most significant changes coming to the mid-size EV pair is a standard lithium iron phosphate battery. The other significant change that should help with efficiency is the addition of a heat pump. Both were spotted in a leaked certification document posted on the Rivian Owners forum. The 64-page doc also mentions the EPA-estimated range figures for the new battery and wheel combinations.
The certification doc doesn’t mention what type of tires were fitted to each wheel size, but the 20-inch ones are likely covered in all-terrain rubber, while the bigger ones get a set of street tires. With the new, lighter LFP battery pack and 20-inch wheels, the R1S has a curb weight of 6,532 lbs, while the R1T tips the scales at 6,507 lbs, according to the paper. The same document includes several range figures for the R1S.
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