MY2027 R1S / R1T EPA Certification

[kanundrum]

Rivian Model Year 2026 vs. 2027 Lineup Comparison

Feature / Specification	Powertrain / Trim	Model Year 2026 (MY26)	Model Year 2027 (MY27)
Quad Motor	Motors & Output	4 Motors (Ascent Quad) generating 1,025 hp & 1,198 lb-ft torque	4 AC Permanent Magnet "Ascent" Motors (1,025 hp / 804 kW total output)
	Gear Ratios	Front: 9.0:1 / Rear: 11.7:1	Front: 9.0:1 / Rear: 11.7:1 (Carryover)
	Battery Pack	9-Module Max Pack (140 kWh net capacity)	9-Module Max Pack (392 V, 787 kg mass, 190 Wh/kg specific energy)
	Charging Hardware	Native NACS port + CCS adapter	Native NACS port + bundled SAE J1772 AC Adapter (PT01472026)
	EPA Certification Standard	Tier 4 Bin 0 MDPV	Interim Tier 4 Bin 0 / Tier 3 Bin 0 MDPV (Regulatory update for compliance)
	Wheel / Tire Options	20" All-Terrain, 22" Sport, 22" UHP Staggered	20" AT (275/65R20), 22" Standard (275/50R22), 22" UHP (F: 275/50R22, R: 305/45R22)
Tri Motor	Motors & Output	3 Motors (1 Front, 2 Rear) generating 850 hp & 1,103 lb-ft torque	3 Motors (850 hp / 1,103 lb-ft torque) (Refined thermal management logic)
	Battery Offering	Max Pack standard (~140 kWh net)	Max Pack standard (~140 kWh net)
	EPA Range (Est.)	~371–380 miles (depending on wheels/tires)	~371–380+ miles (Optimized highway energy draw)
Dual Motor (Long Range / Premium)	Motors & Output	2 In-House Enduro Motors (533 hp Base / 665 hp Performance Upgrade)	2 High-Efficiency Motors (533 hp Base / 665 hp Performance Upgrade)
	Battery Offerings	Large Pack (105.5 kWh) and Max Pack (140 kWh) (Base 92.5 kWh Standard Pack sunsetted mid-2026)	Large Pack (105.5 kWh) becomes standard entry battery; Max Pack optional
	Lineup Structure	Streamlined trim hierarchy (Adventure / Ascend cabin themes)	Large/Max Pack model positioning optimized to distinctively step above R2
	Charging Hardware	Native NACS port + CCS adapter	Native NACS port standard

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[motobell]

so no change at all?

 

[mkhuffman]

so no change at all?

Not surprising. Maybe a new color or two?

I am hoping big changes come in 2028. Making big changes in the middle of the R2 launch would be very risky, and unnecessary. Also I think they are on a three year major refresh cycle.

 

[TexasBob]

Unsurprising that there are no powertrain upgrades. Question in my mind is whether the Autonomy system will be upgraded to RAP1 or not.

 

[Dark-Fx]

Unsurprising that there are no powertrain upgrades. Question in my mind is whether the Autonomy system will be upgraded to RAP1 or not.

It'd probably have a big enough effect on power usage that they'd have to retest, and they did not.

 

[TexasBob]

It'd probably have a big enough effect on power usage that they'd have to retest, and they did not.

Hmm. I had not thought of that.

 

[Megaman0025]

Would be really interesting if they brought the R2 motors to a new model in 2028- they seem to be more efficient and more efficiently packaged as well- and yes, it would require new EPA testing (and $$$) to do so.

 

[motobell]

Would be really interesting if they brought the R2 motors to a new model in 2028- they seem to be more efficient and more efficiently packaged as well- and yes, it would require new EPA testing (and $$$) to do so.

Why would it require new testing if the motors are already proven in R2.

 

[Eric9610]

Why would it require new testing if the motors are already proven in R2.

New Motors in a New model = new SKU

My guess is that the next update on the R1 will be a major one pending R2 success.

New motors
800v pack
Rap 1

New higher price.

 

[Megaman0025]

Why would it require new testing if the motors are already proven in R2.

It's not about proving the motors, they're fine - it's about doing an EPA test cycle on a different platform with those motors. There will be a different EPA rated range. And, as already stated on the post above this, it would be a new SKU and would be required to go through those testing metrics.

 

[lefkonj]

The only changes I could see are the steering wheel and chipsets, maybe LIDAR. No reason to change anything else right now.

 

[Eric9610]

The only changes I could see are the steering wheel and chipsets, maybe LIDAR. No reason to change anything else right now.

No changes will happen to the R1 until all models of the R2 are launched and proving demand. Capital is to important right now and everything Rivian does needs to be hyper focused on R2.

At this point a 2029 model will have major updates and be the next "G3".

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