I probably should've asked this before ordering the wheels, but oh
I ordered a set of 8-lug, 16x10 Eagle Alloy rims to match up the new 14
bolt I'm installing in my K5 Blazer. I've now begun to question my
I'm assuming that the the stock wheels are 15x10. I run 31x10.50's on
them. They are the 6-lug late-80's Rally type that normally uses a
trim ring and center caps that bolt onto the rim.
I'm concerned that with the wider wheels that I might get a little tire
rub. I'm not taking this thing off road just yet, still got to get
some lift because I do plan on running 35's or better.
I'd still like to run the stock diameter (31") for the time being. Can
I get a 31" tire for a 16" rim? I saw 33's on a Suburban recently with
no lift, so I think I can fit them on there.
Or did I just do something stupid by ordering the rims without thinking
Honestly a 10 inch wide wheel is too big for a 31" tire a 8" would be
more in order up to 33's or so because the wider the rim, the more
likely there will be interferance on the front axle when turning because
of increased rim width and offset. It can be a balancing act at times.
Well... Just checked the clearance (visually). 33's should fit without
any tire rub as long as I keep it on the street and don't drive like an
But your comment brings to mind an article I read recently about "scrub
radius" or something like that. Basically it just stated that if you
drew a straight line following the angle of the kingpin going all the
way to the ground, the middle of the tire should meet that line for
best steering results.
But still... I have 16x10's on the way and NO lift. So 33's are about
as big as I can reasonably fit under there. Am I correct that my
existing wheels are 10" wide? Again, they're stock K5 4x4 Chevy
I just checked some stock wheels for sale on eBay. They list the 6 lug
wheels as 15x8's. I'm assuming the 10.50" tread would work fine on the
10" wide wheels.
Stock Rally wheels are 8inch. You will have to do a bit of fender trimming
with 35s on 10inch wheels. I am running 33x10.5-15's on 15x10's. They look
perfect. fill the wheel wells great, barely stick out at all in front, and
wear and handle awesome!
If you are planning on running only a 31inch tire with 4.56 gears, I
hope you have an overdrive! Also, a 31inch tire less than 12inches wide will
give you a pretty choppy ride on a 10inch wheel. If you run a set of
255/85-16's, the 10 inch wheels will be great! Tire selection is far to
limited in that size, but it comes out to 33x10.5's. Depending on what
region your in, there are a couple great mudders in that size. If your in a
place that sees any serious snow/ice, look for a tread that has allot of
The extra inch of sidewall from a 31x10.5 and a 33x10.5 does make a big
difference. I ran the exact same wheel(15x10) on the same vehicle('85
Suburban) with the same tire brand and tread design(BFG A/T) and the ride
difference was more than noticeable!
I did notice while tire shopping online and through the magazine ads
that the selection of tires for 16" wheels in general seems limited.
33's are what I'm shooting for. And yep, I have the 700R4 tranny, so I
got OD too. The RPM calculator on Randy's Ring & Pinion's site shows
I'll be pulling 1950rpm @ 60mph. Before, with the 3.08 gears and 31"
tires I was pulling 1402. Their guidelines show the recommended RPM
range on a small-block Chevy to be 1800-2800rpm, so the 4.56's and 33's
should be a good combo. A buddy has the same config of gears and tires
on his Jeep and it works quite well.
Well, if I can change the order (hopefully it hasn't shipped) would you
recommend getting an 8 inch wide wheel instead of a 10" ?? And then
using a 33x10.50R16 (or close to that)?
I would recommend going with 8inch wheels if you are going to go with
less than a 33+ inch tire. Running a 265 with an 8inch wheel would be a
Comparing your full size 4x4 Chevy truck to a jeep is like comparing the
MPG of a Suburban to that of a Honda Civic! You have almost twice the
There are an AMAZING amount of height and width combinations when it
comes to tires for 16inch wheels.
You have done your home work some on gear ratios but just remember
that it is not all simple math because with larger tires and increased
height also come increased drag and the lowest possible RPM is not
always the best for MPG. A heavier truck truck needs to turn more RPM
cruising for best performance and MPG because you do not want to have
it kick out of OD on most hills on interstate. Myself, I think 2100 to
2200 rpm at 60 with a GM SB in a 4x4 is a better compromise for power
of MPG in OD.
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265/75R16's seem pretty easy to come by. The metric to inches
conversion puts them at 10.82" wide and 31.65" tall. That'd keep the
stock tire diameter.
BTW, I need to be able to fit into the parking deck at work (for now).
Otherwise, I'd lift and some some 35's on there :-) That's why the
stock tire diameter is important to me.
Will the 14-bolt add any height? I was just thinking, being that the
axle tubes are a larger diameter, won't the spring perches be
higher/closer to the body, adding just a hair of lift?
Ok... after looking at a few previous posts on this NG, I'm seeing the
opposite--that 16.5" rims don't have a good bead, and that the 16" is a
Also, a quick eBay search turned up 106 items when searching "`16.5
wheel*" and over 4000 items when searching for 16 wheel*. There's a
lot more 16" wheels available. If they are worse, why such a huge
BTW, 15" wheels won't fit my 14-bolt, correct?
yea...and 15inch wheels will fit! I have put 15inch wheels on 3/4T
trucks from early '70 into the '80 vintage. 15inch wheels fit GM 14bolt
rears with no problems, they are a major problem fitting on the front.
I will send you some pics of a 10.5 ring gear 14bolt with 15inchers on
if you like...I have one sitting in front of my home right now.
Its rare to be able to select the backspacing, but if you can, ask the
company that you are getting the wheels from. That's what their service
dept. is there for.
I do believe that the standard backspacing is 4.5inch on a 16x8inch.
I think you said you were going with American Racing Wheels? If so, go
with their AR-23! Its an awesome looking wheel on the '73-'87 style Chevy!
The OutlawII is another awesome one. I wish they made the AR-23 in a 16x10!
When you say "front end" which axle are you talking about? A Dana 60?
Cause I've never seen or heard of a 14-bolt front end.
I have heard of custom Dana 70 fronts, and I saw an article where Dana
started making one to be offered as standard on something huge, like an
F-450 or something.
Send a pic of a 14-bolt front end if you got one. I'd love to see
I actually have decided on Eagle Alloy's style 058. They look kinda
like the AR Mojaves, which I'd really prefer, but don't want to spend
twice the $$$ on.
The Mojave is available in black, the Eagle Alloy isn't... I suppose
I'm gonna get em powder coated or painted later. I REALLY want black
Concerning the backspacing...the loaner Suburban I'm driving now (till
the K5 is fixed) has 31x10.50's like the K5, but they stick out more,
so I'm supposing the wheels have less backspacing (or more). It
definitely looks better, and may explain why the Sub handles exactly
like my K5--it has a wider track and therefore it's more stable....?
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