Question Britax Frontier 85 in center seat of Prius?



I just got the Britax Frontier 85 but when I tried to install it in the center seat of my Prius, the harness straps would not move because they are pressed again the back of the car's seat. I can move it to an outboard seat but one perk of an only child is the ability to keep her in the center. I'm now wondering if I should get another seat instead. Maybe the Graco Nautilus? Or should I wait for the Argos, though that seems a long way off. Does anyone have a seat they recommend for the Prius to be able to keep my daughter in the middle?

Thanks so much.


Admin - CPST Instructor
Staff member
The Argos is out and in stock in many stores.

However, how often are you changing the harness height? It's usually every six months or a year or something. Not weekly or daily. Could you just unbuckle the seatbelt (since LATCH isn't allowed there) and reinstall on the rare instances you need to adjust the harness?



New member
There should be a black piece that comes on the back of the frontier and encloses the harness. If you call Britax they'll send you one if your seat didn't come with it.


New member
What Jessica said. Does the Frontier fit tightly in the center? (Just curious, I've never tried, but the Frontier is huge and that center seat is tiny.)


Thanks for the replies. I guess I wasn't clear enough though. It's not that I can't adjust the harness height - it's that I can't tighten or loosen the harness straps because they are so tight against the back of the seat of the car. The seat did come with that back piece but it doesn't cover the right part of the seat - the straps still press up against the back of the car's seat, hence making loosening and tightening close to impossible. We did actually get a good install other than that, and I really prefer having her in the center, but obviously I can't keep it there if I can't tighten my daughter into the seat. So I was just hoping someone with a Prius might be able to shed some light on whether another seat might work better there. Perhaps the Graco Nautilus?


New member
I am only posting because I just installed this seat into my Toyota Matrix (outboard still using latch.) These are probably very obvious things, but they were different things from how our marathon worked so I thought I would post them...the folding piece on the bottom is flipped forward right? The other thing that is different than the MA is that I have to push down on the button to lengthen the harness straps, and I think in my MA I had to pull up on a lever to lengthen. I know these are probably not your issues, but thought I would post them since they were just a couple of quirks that I found to be different than my MA when installing.

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