Question About Multi-lug Pattern Wheels

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Hi Everyone,

 

This is such a great site. I'm new to the forum and just recently bought a 2008 Silverado 1500 Z71 CC in Graystone Metallic. It came with the 17" OEM aluminum wheels and I'm looking to upgrade. I've been doing lots of research and I've seen a few wheels out there that list more than one bolt circle diameter in their specs, (such as 6 x 135/5.5) but identified with one part number. I worked 10 years for a now out of business US supplier of OEM cast aluminum wheels. I was a Program Manager so it was my responsibility to insure successful launches of new wheel styles at our wheel manufacturing plants. Given my background, (I've forgotten more about what goes into designing and making wheels than most people will ever know), I feel kind of funny asking this question. Are the hub areas of these wheels designed with two different sets of lug holes, one with a 135mm bolt circle and the other set of holes off-set at an angle to achieve a 5.5" (139.7mm) bolt circle? Or are the lug holes slotted some how? I was involved in alot of up-front design work on wheels in my past life and I can't see either being a very structurally sound design as the hub area absorbs alot of cornering stress.

 

I'm looking at 17 x 8 x 20mm Eagle Alloys 050 in Super Finish Machined/Black window pockets and 285/70R17 Nitto Terra Grapplers. I'll be installing a leveling kit up front.

 

Thanks!!

[8.1HD/ALLISON]

I have never seen any wheels with slotted holes. (intentionally anyhow, if you leave them loose they will become slotted lol) I would say if they fit different bolt patterns they are drilled for both patterns, unless you have to specify when you order.

[mastrcruse]

Sorry for bringing this back but wanted to know/confirm our trucks bolt pattern. Our trucks GMT900 have the 6x135 correct? Thanks

[700 sportsman]

No, it is 6-139.7 (6-5.5)

[mastrcruse]

Thanks for your help.