Anyone know the exact specs for our ADV series rims?
16" X 7.5"?
Offset?

What other dimensions do I need to look for new rims?

Anyone know the exact specs for our ADV series rims?
16" X 7.5"?
Offset?

What other dimensions do I need to look for new rims?

Depends upon the tire you are fitting...

okay, I read all of the posts regarding bigger size tires, couldnt find the answer I am looking for, maybe someone can help. my H3 came with the offroad package except the tires that came with Goodyear 32s. (265/75)

I want to upgrade to 33s or 285s, I found BFG (285/75) and also found Mickey Thompson 33x12.5 and 33x11.5 (all for 16 inch rims)

what is REALLY worrying me is the 7.5' rim width, I DONT want to change the OEM rims, but I am worried about the 7.5 width on 33s. bearing in mind that I do EXTENSIVE offroading mainly on soft sand and sometimes rocky hills.

whille offroading on soft sands I usually air down to 5 PSI on my Chevy Blazer ZR2 with 31x10.5 BFG KO AT. I tried airing down to 15 PSI on my H3 it didnt work, I went further down to 10 PSI, some improvement but still not enough grip like the BFG, plus my H3 is heavier than my ZR2. if I air down more I am afriad the tire will come off the rim.

so I decided to go for 33s, but I am confused about the 7.5 width. which 33 should I put and air down to 5 without loosing the tire off the rim while offroading. anyone has any experience with this on the H3. I AM NOT LOOKING FOR PIMPY STREET TIRES, my interest is offroad.

SledgeHummer

For the adventure package rims they are made to not loose the seal of the rim with low air pressure. Not sure how low but maybe 20 PSI I am guessing or lower.

The warning light for low air is just a new govt. thing.

Beadlocks, beadlocks, beadlocks!

-C

beadlocks would be my first choice if I wanted to change the rims, but I mentioned I want to retain the Hummer rims.

SledgeHummer

You could find some 15x10 or 16x10 beadlocks with 4.5" - 5" backspacing that would be very close to stock geometery.

-C

Ok here are the pics. Just changed my tires today to 285/75R16 BFG. surprisingly I didnt even have to do wheel alignement, drove the truck to its limit speed 170Km/h and it was as steady as the OEM tires.

No backspacing,l OEM rims did very well, now all I need to do is test them offroad with air down to 5 PSI.

One thing I didnt understand though, I installed the new tires and filled them to 35 PSI but when I'm driving, I still get the "low tire pressure" warning light and alert message !!! why is that ? any ideas ??

SledgeHummer

16 x 7.5"
bolt patten 6@5.5" (or 139.7mm)
offset +30mm
Centerbore 100.6 (this is a problem with a lot of the wheels because most other GM vehicles that fit the 6@5.5" pattern have a center bore of 87 and these whells will not fit the H3, the centerbore is too small)