Largest size spare tire fit in undermount carrier?

[RunnerRocks]

Toyo OC AT3 LT275/70R18
E-Rated 33.2" at 36 PSI.

I found that by just fully cranking the tire up, it will not fully seat up against the top horizontal of the forward brackets. It feels secure, but is not fully seated.

Near the top of travel, I need to twist & wiggle the tire with each small lift increment for it to finally fully seat.

This leaves no more than 1/4" space between the the hitch and tire.

Sponsored

 

[3rdRunner]

Here's my take from everything posted, including my own experience. I'm thinking the profile of the actual tire you're installing is very relevant.

32.6" stock obviously fits fine. pic at front bracket attached for reference of how stock tire sits.
33.5" Toyo AT3 fits per MPS2026. photos shown in their posts above.
33.7" K03 fits with mod to front bracket - this is my setup with 285/70/18 K03. Pic of modified bracket attached.
33.9" Toyo AT3 285/75/17. Comments above make this an interesting one. A 33.9" would definitely not fit if the tire profile was like my K03. With a more square profile like the K03, the tire would hit low on the radius of the front bracket and not be sitting flush against the horizontal surface meant for the tire to be pulled up against. Maybe it works if the tire is rounder vs more square???

@Van Solo - maybe it's worth a check to see if the AT3 profile would allow it to fit?? Maybe the tire profile is different enough based on 3rdRunner's experience.

@3rdRunner - Would be great if you get a chance to post a pic of the tire at the front bracket (and maybe above) to give anyone else checking this thread as much real-world experience as possible.

I've included a pic to show my tire sitting flush/tight against the horizontal portion of the bracket. I'd want to make sure this was the case on any larger tire as I wouldn't want the tire only held against the radius of the front bracket.

Sorry - I checked and I don’t have pics of the brackets. Just the tire in position as I posted before. Unfortunately, I’ve moved on from the AT3 and the new tires definitely do not fit.

 

[Van Solo]

Here's my take from everything posted, including my own experience. I'm thinking the profile of the actual tire you're installing is very relevant.

32.6" stock obviously fits fine. pic at front bracket attached for reference of how stock tire sits.
33.5" Toyo AT3 fits per MPS2026. photos shown in their posts above.
33.7" K03 fits with mod to front bracket - this is my setup with 285/70/18 K03. Pic of modified bracket attached.
33.9" Toyo AT3 285/75/17. Comments above make this an interesting one. A 33.9" would definitely not fit if the tire profile was like my K03. With a more square profile like the K03, the tire would hit low on the radius of the front bracket and not be sitting flush against the horizontal surface meant for the tire to be pulled up against. Maybe it works if the tire is rounder vs more square???

@Van Solo - maybe it's worth a check to see if the AT3 profile would allow it to fit?? Maybe the tire profile is different enough based on 3rdRunner's experience.

@3rdRunner - Would be great if you get a chance to post a pic of the tire at the front bracket (and maybe above) to give anyone else checking this thread as much real-world experience as possible.

I've included a pic to show my tire sitting flush/tight against the horizontal portion of the bracket. I'd want to make sure this was the case on any larger tire as I wouldn't want the tire only held against the radius of the front bracket.

@rutsnext I value your assistance to date and once we do it will no !

Sponsored