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That make smore sense, in the model 3, model Y and the Rivian 21s you only lose 2-3% at the most, and those do change completely the tire, so an increase of 3-7% with these covers doesn't seem logical. I am no tire engineer either, although I have an engineering degree.

Sounds like snake oil sales tactic. I don't particularly like the covers, but I would probably add it if it was an extra 20 miles, at least for road trips.

Is there any youtube video or anything that shows the gain? A one sentence from the seller saying it has a 10-20 gain but no more information doesn't give me confidence that this has been tested

You are talking about rims, rims in 20s are forged and smaller, way better than 21s and 22s which are bigger, but then tire is way bigger and heavier on 20s AT. So going to a smaller AS like a 275/60/20 would set them to same diameter 33 as teh 21 and 22. Some people are reporting similar range...

That's exactly why I am asking because it seems more logic losing a little range with this combination. I was thinking about going to Pirellis AS3+ 275/60/20 but then I need to recalibrate etc... if these achive the same goal, better ride and better range seem like a better option to me

Did you ever considered switching to the 275/60/20 so you didn't have to recalibrate the car since it's teh same diameter more or less than the 21s?

So switching from stock 21s to Defender 275/65/20 and recalibrating you are getting a better range up to 8%? Wow, that is crazy, not sure why they would not offer this as an option

That's awesome, so it is basically an annoyance and not a real problem if you change it 'but don't recalibrate, right?

Have you already gone to your appointment? I am just curious what are the downsides of what you did if it doesn't get calibrated, please correct if any of these assumptions is wrong: The speedometer will show a little higher speed (3% higher in your car than the real one) Where you able to...

Totally agree.

I just asked my guide what would happen if I bought a set of 21s and switched back and forth between my original 20s and the reply was that I would need to go get them recalibrated to a service center. Trying to get an answer on whether this might be a self-service option in the future.