Envoy center bore size

[dufunnel]

I've been looking around at wheels for my 06 Envoy Denali and have a question regarding the center bore size. What is it? I have gotten conflicting answers on whether wheels will fit or not, and it looks to me like it has to do with the center bore, not the size of the wheel or offset, because they are all similar. Is there a specifications website that gets into this much detail? I tried measuring it myself but it looked to me like it was over 80mm, which doesn't make sense because I see that it should probably be 78mm. Are the years different? I would doubt it, but not sure. I don't want to buy a set of wheels and not have them fit because the center bore is the wrong size. The ones I'm most interested in are the Driv Royale 22", but the center bore size on them is 78mm, so I want to find out if that is right or not. My sanity check just confused me because it was off so much.

[blktbz]

the rims i put on my TB have a center bore of 82.80mm...i doubt that helps, but thats what mine are..

[ylab]

Even with the correct center bore, you need to make sure that the lug pattern is 6x5 or they're still not going to fit. (6 lugs on a 5 inch or 127.5mm circle). The Envoy, Trailblazer, Bravada, Rainier & Ascender are pretty much the only vehicle with that bolt pattern. If they have the correct bolt pattern, odds are the center bore will be correct for our application.

[dufunnel]

Thanks. Yeah I knew the bolt pattern and offset numbers, but not too many places actually share the center bore size unless you ask. With the ~83mm center bore, is the bore larger than the hub by a bit, or does it fit right? That's about what I measured on my center bore, but I have yet to find any center bore numbers on wheels that indicate that.

[Trailblazin]

from what i know, it should fit perfect just on the hub

[blktbz]

these trucks are lug centric, not hub centric....meaning that the rim is really held on by the lugs that center the rim across all studs evenly....i went through this problem when my rims were installed cause the center bore on my rims were larger than the bore of the wheel hub..you should be fine....just make sure they use centering lugs when theyre installed

[dufunnel]

I just don't want to get a wheel with a center bore that's smaller than the bore on the rotors. Anyone actually have the number of the center bore on the rotors or can refer me to a spec sheet that has that information on it?

[blktbz]

mine rims had a bore of 82.8mm like i said, and they fit fine...so something around that ballpark should be fine...your best way of finding out is to take a wheel off and measure it..

[Envoy Fan]

I've had several different aftermarket wheels on my Envoys (first my '03 and currently my '05) and never was concerned with bore size. If it is 6x5 (127mm) it should work.

[ScarabEpic22]

these trucks are lug centric, not hub centric....meaning that the rim is really held on by the lugs that center the rim across all studs evenly....i went through this problem when my rims were installed cause the center bore on my rims were larger than the bore of the wheel hub..you should be fine....just make sure they use centering lugs when theyre installed

Umm, youve got it backwards, TBs and Voys are HUB centric, NOT LUG centric. The rims are supported by the hub, not the lugs. Talk to the roadie and confirm that.

[the roadie]

Umm, youve got it backwards, TBs and Voys are HUB centric, NOT LUG centric. The rims are supported by the hub, not the lugs. Talk to the roadie and confirm that.I agree the OEM wheels (at least the 17" polished aluminum ones I have) are hubcentric. The wheel hole is very closely matched to the hub. Even though we have cone-bottomed lug nuts that will nicely center the wheel on the lug circle, literature suggests that the actual stress and impact transfer is supposed to go from the rim to the hub to the bearings and not annoy the studs.

However, I (and almost all wheel spacer buyers so far) are using spacers that are hub-centric to the hub, but since they lack a matching protruberance on the outside surface, they're LUG-centric to the rim. They depend on the cone-bottomed lug nuts to perform the centering function, and stress is shared with the studs. This could be a bad thing, and I keep checking for cracked studs and haven't found any after a lot of offroad abuse. Lugcentric installations might suffer from slight balance problems, but I haven't seen any at up to 85MPH.

So I conclude that an aftermarket rim with a too-large bore hole will be adequately centered and supported by the lug nuts. And at that point it can be called being lugcentric. You could always buy aftermarket shim rings such as the ones at http://www.prestigewheel.com/RetailHubRingsMostTrucksSUVdually.asp but then you'd have to bore out the rim to even larger diameter than they come in, I bet.

But since our vehicles are the ONLY ones using 6X127 lug pattern =, the aftermarket rims only have to fit one hub size, so any competent manufacturer is going to get it right.

If anything happens to my setup with the spacers, I'll just repair the damaged studs, then buy Fred Goeske's spacers with the extra flange for $20 more each. Then they would be hubcentric to the hub and also hubcentric to the wheel.

[blktbz]

my aftermarket rims are lugcentric...ive talked to the seller and the manufacturer (BOSS and Eagle Alloy) and thats what theyve told me...thats why there are no centering rings available for our truck...so far so good with mine....nothing wrong, no vibrations...