Welcome to Tesla Motors Club
Discuss Tesla's Model S, Model 3, Model X, Model Y, Cybertruck, Roadster and More.

Model S Booster Carseat Recommendations?


Active Member
Aug 11, 2014
We love our Diono Radian. Can be a little hard to install but it's built like a tank and is narrow so fits well in the back seats.

Agree - 5 yr old and twin 3 yr olds.


Car seat or booster? For car seat, Diono Radian RXT. For booster, this $22 Cosco seat at Amazon works great:


Did you also purchase a seatbelt extender?
  • Like
Reactions: CUBldr97


Apr 14, 2018
Boston, MA
We love our Diono Radian. Can be a little hard to install but it's built like a tank and is narrow so fits well in the back seats.
Does the radian sit flush against the back and bottom of the seat? Our Diono r100 does not so I am looking for something else. Our 6 yo still falls asleep in the car and since it's not safe for her to slump over, I really want something with a back but haven't been able to find anything.


Apr 14, 2018
Boston, MA
I've never used with a seatbelt extender, but might be helpful if you're trying to put 3 side-by-side.
Note that no car seat or booster has been crash tested with seat belt extender and it's just another point of failure, so I believe most technicians (and the Tesla S manual) will tell you not to use them.


May 31, 2017
If you’re looking for a narrow backless booster that fits the Model S (and does not cover the buckle receptacle), I would recommend the Cosco Rise booster. It is a new booster and it is only $10 at Walmart. My kids didn’t like the bubble bum because of the additional steps involved in securing that seat, and this Cosco is a lot easier. I also tried the Harmony youth booster and that too was better than my former standby - the Graco turbo booster - but not as narrow as the Cosco. And for me, a seatbelt extender seemed too risky given the lack of testing and the fact that most of them are not sold by major companies.
  • Like
Reactions: Sfallert


Jul 11, 2015
Austin, Texas
I have both - the Diono for my 5 year old and the Cosco for my 9 year old. Wish I could still convince my 9 year old to ride in a real car seat - as safe as the Tesla is, I still feel better about having him in a fully enclosed seat.

If using the Cosco, put your kid on the drivers side as the car gets angry/confused when he would accidentally plug into the center buckle when on the passenger side.


May 17, 2017
I picked up two of these today for my four year olds. Still a little hard for them to buckle themselves in but hopefully with time they’ll figure it out. I had to return the graco brand booster seats since they have a wide base and cover the seat buckles.

I see people in the forum suggest using a seatbelt extender. I for one would never use something like that unless it was approved for car seats, which none of them are.

I also see a post with three car seats in the second row. The owners manual says not to do that as well.

Chicco® KidFit™ Zip Luxe 2-in-1 Belt Positioning Booster Seat in Dolce Limited Availability Attention California Residents Chicco® KidFit™ Zip Luxe 2-in-1 Belt Positioning Booster Seat in Dolce
  • Helpful
Reactions: David.85D

Eric M

Jul 30, 2020
Anyone have more current recommendations for the S? We really want one with a back and using LATCH. New car comes Thursday so I'm a bit late thinking about this now!


Active Member
Oct 29, 2016
It’s been a few years now, but we really liked our cybex booster with z-fix. Very nice stuff.

It has a metal clamp that held it in place to the latch anchors so it wouldn’t flop around when no one was sitting in it.

The kid still used the seatbelt.

And, please don’t use seat belt extenders with car seats. I bought one too, as it seems easier, but then I read some horrifying stories of kids getting unclipped and hurt in accidents. Totally not worth it.
  • Like
Reactions: Eric M

Products we're discussing on TMC...

About Us

Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.

Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.