Spare tire

[EVCar]

Here are the specs for front and rear. Only
Looked up the 20/21 on TireRack.com. A little bit different outside diameters. Not sure if this is acceptable:

This front/rear set fits your 2025 Lucid Gravity 265/50-20F 285/45-21R.

• Size:265/50R20 (Front)
• Service Description:111Y
• Load Range XL
• Max. Load= 2,403 lbs
• Max. psi= 50 psi
• LM1 Lucid, soundabsorber
• Eco Focus:EV Eco Focus tire technology emphasizes low rolling resistance, resulting in better fuel economy.
• Noise Reduction Technology
• Electric Vehicle Tuned
• UTQG:600 A A UTQG
• Max. Load:2,403 lbs
• Max. Inflation Pressure:50 psi
• Tread Depth:9.5/32"
• Tire Weight:36 lbs
• Rim Width Range:7.5-9.5"
• Meas. Rim Width:8.5"
• Sect. Width:10.9"
• Tread Width:8.4"
• Overall Diam.:30.2"
• Revs. Per Mile:687
• Country of Origin*:KR

• Size:285/45R21 (Rear)
• Service Description:113Y
• Load Range: XL
• Max. Load= 2,535 lbs
  Max. psi= 50 psi
• LM1 Lucid, soundabsorber
• Eco Focus:EV Eco Focus tire technology emphasizes low rolling resistance, resulting in better fuel economy.
• Noise Reduction Technology
• Electric Vehicle Tuned
• UTQG:600 A A UTQG
• Max. Load:2,535 lbs
• Max. Inflation Pressure:50 psi
• Tread Depth:9.5/32"
• Tire Weight:36 lbs
• Rim Width Range:9-10.5"
• Meas. Rim Width:9.5"
• Sect. Width:11"
• Tread Width:8.6"
• Overall Diam.:30.9"
• Revs. Per Mile:673
• Country of Origin*:KR

https://www.tirerack.com/tires/tires.jsp?tireMake=Hankook&tireModel=iON+evo+AS+SUV&frontTire=65YR0IH01AXL&rearTire=845YR1IH01AXL&vehicleSearch=true&fromCompare1=yes&autoMake=Lucid&autoYear=2025&autoModel=Gravity&autoModClar=265%2F50-20F%20285%2F45-21R

FWIW, off the cuff comment from a techs supervisor at the SC was that he saw no problem with the smaller wheels on the rear. But he wasn't 100% sure.

 

[ButMahElectrons]

YES YES and YES. Even if all the stuff in the car OEM was correct, how do you know its all there, correct and you can use it. Would you not rather learn how to use the jack, spanner, lug nuts and spare in a nice warm garage. OR on the side of the interstate in the freezing rain. Friend called one late night asking for me to drive over a breaker bar. Seems he had a flat in his newish suburban near my house. It had a small lug wrench and the lug nuts are fixed at 150 ft pounds. Now he carries a breaker bar.

While I agree that the old days of a FULL size spare, jack and spanner extension was wonderful, I read that tire quality has improved so much that the number of flat tires now is a fraction of the 1980s or before. Unless you have LOW profile tires on a heavy car.....

IDK about that.....maybe my luck had just taken a turn for the worse.....or maybe there's more crap on the roads.
But I've had probably 3 or 4 flats between all my cars, with one on the Lucid just this weekend, since 2020.
Whereas before that, I think I had 1 flat since college!
The rest were all just slow leaks due to a bad valve here, or corrosion on the rim there. Easy enough to deal with, with a pump-up and tire store visit on my own time.