Spare tire

T

tmsnyder

Well-known member
Jan 15, 2014
3,351
1,241
113
Buffalo NY
Just out of curiosity, and since my 8-lug '97 GMC suburban is sitting right next to my GMC motorhome, and since I'm short a rim for a spare tire, I
tried a tire off the suburban on the motorhome, and it fits! You guys probably knew that but it made me happy.

So my missing spare tire problem might be solved. It will stick out about 4 inches(?) compared to the original, but, for a spare it will get me down
the road if I need it.

It's 245-75R16, pretty close to the same overall diameter, and it's E rated. Doesn't come anywhere near the calipers. The center hole looks to be the
same as the hub.

I'll have to find some lug nuts b/c they are acorn style instead of the flat style, although I would probably just use the flat ones if I had to.

I'm just thinking that if someone was in a real bind and needed a wheel in a hurry, these GM 8 lug pickup / suburban truck tires are everywhere.
--
Todd Snyder, Buffalo NY
1976 Eleganza II
 
I'm sure the rim will not clear the front caliper and also the hub fit will
not be correct.

On Thu, Jun 20, 2019 at 2:03 PM Todd Snyder via Gmclist <

> Just out of curiosity, and since my 8-lug '97 GMC suburban is sitting
> right next to my GMC motorhome, and since I'm short a rim for a spare tire,
> I
> tried a tire off the suburban on the motorhome, and it fits! You guys
> probably knew that but it made me happy.
>
> So my missing spare tire problem might be solved. It will stick out
> about 4 inches(?) compared to the original, but, for a spare it will get me
> down
> the road if I need it.
>
> It's 245-75R16, pretty close to the same overall diameter, and it's E
> rated. Doesn't come anywhere near the calipers. The center hole looks to be
> the
> same as the hub.
>
> I'll have to find some lug nuts b/c they are acorn style instead of the
> flat style, although I would probably just use the flat ones if I had to.
>
> I'm just thinking that if someone was in a real bind and needed a wheel in
> a hurry, these GM 8 lug pickup / suburban truck tires are everywhere.
> --
> Todd Snyder, Buffalo NY
> 1976 Eleganza II
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502
 
Sir: if you are planning on using an 8 lug straight 3/4 ton style wheel as a spare, it won't work well at all on steering axel. Even if you use the
cone shaped lug nuts and get it clamped on tight and straight it will pull one sided so bad you will not be able to drive it hardly at all. Now if
you carry 2 and run both fronts it will work.
You will be better off with a steel dish dually style16.5 as a spare. I have one in ETenn free for pick up.

> Just out of curiosity, and since my 8-lug '97 GMC suburban is sitting right next to my GMC motorhome, and since I'm short a rim for a spare tire,
> I tried a tire off the suburban on the motorhome, and it fits! You guys probably knew that but it made me happy.
>
> So my missing spare tire problem might be solved. It will stick out about 4 inches(?) compared to the original, but, for a spare it will get me
> down the road if I need it.
>
> It's 245-75R16, pretty close to the same overall diameter, and it's E rated. Doesn't come anywhere near the calipers. The center hole looks to be
> the same as the hub.
>
> I'll have to find some lug nuts b/c they are acorn style instead of the flat style, although I would probably just use the flat ones if I had to.
>
>
> I'm just thinking that if someone was in a real bind and needed a wheel in a hurry, these GM 8 lug pickup / suburban truck tires are everywhere.

--
C. Boyd
76 Crestmont
East Tennessee
 
Flat on the front just put the spare on the back and it on the front. More work but what are the chances it will happen anyway 110%.

> Sir: if you are planning on using an 8 lug straight 3/4 ton style wheel as a spare, it won't work well at all on steering axel. Even if you use
> the cone shaped lug nuts and get it clamped on tight and straight it will pull one sided so bad you will not be able to drive it hardly at all. Now
> if you carry 2 and run both fronts it will work.
> You will be better off with a steel dish dually style16.5 as a spare. I have one in ETenn free for pick up.
>
>
>
>

> > Just out of curiosity, and since my 8-lug '97 GMC suburban is sitting right next to my GMC motorhome, and since I'm short a rim for a spare
> > tire, I tried a tire off the suburban on the motorhome, and it fits! You guys probably knew that but it made me happy.
> >
> > So my missing spare tire problem might be solved. It will stick out about 4 inches(?) compared to the original, but, for a spare it will get
> > me down the road if I need it.
> >
> > It's 245-75R16, pretty close to the same overall diameter, and it's E rated. Doesn't come anywhere near the calipers. The center hole looks to
> > be the same as the hub.
> >
> > I'll have to find some lug nuts b/c they are acorn style instead of the flat style, although I would probably just use the flat ones if I had
> > to.
> >
> > I'm just thinking that if someone was in a real bind and needed a wheel in a hurry, these GM 8 lug pickup / suburban truck tires are
> > everywhere.

--
1977 Kingsley 455 as stock as it gets except lots of Ragusa parts
 
> Just out of curiosity, and since my 8-lug '97 GMC suburban is sitting right next to my GMC motorhome, and since I'm short a rim for a spare tire,
> I tried a tire off the suburban on the motorhome, and it fits! You guys probably knew that but it made me happy.
>
> So my missing spare tire problem might be solved. It will stick out about 4 inches(?) compared to the original, but, for a spare it will get me
> down the road if I need it.
>
> It's 245-75R16, pretty close to the same overall diameter, and it's E rated. Doesn't come anywhere near the calipers. The center hole looks to be
> the same as the hub.
>
> I'll have to find some lug nuts b/c they are acorn style instead of the flat style, although I would probably just use the flat ones if I had to.
>
>
> I'm just thinking that if someone was in a real bind and needed a wheel in a hurry, these GM 8 lug pickup / suburban truck tires are everywhere.

You can always do what most Big diesel pusher people do.
Call your Emergency service provider and have them send the tire service out with a tire and have them put a new tire on.
If it just needs a plug they will plug it. Keep in mind most will not plug the steering axel tire.

--
Tom Lins
St Augustine, FL
77 GM Rear Twin, Dry Bath, 455, FI-Tech EFI
Manuals on DVD
http://www.bdub.net/tomlins/
 
Not sure what to tell you, it fits fine on the front and turns freely.

There's no interference with the front disk brake calipers. Actually there's much more clearance b/c the bolting flange is near the center of the
tire instead of having the rim pushed in around the caliper and the bolting flange at the outside plane of the tire. Tons of room around the brake
caliper.

On the'76 GMC the hub center measures 115.8 mm with my Mitutoyo dial calipers. (I just went out in the rain and measured) and '97 GMC 8 lug rims are
listed as having a bore of 116 mm. And I physically put a '97 rim on the '76 and it appears to be an appropriate fit at the hub. The center hole is
the same diameter.

The '97 GMC is listed as having an 8 on 165.1 mm bolt pattern. That's exactly 8 on 6.5", same bolt pattern.

I would carry an E rated tire as a spare, the motorhome came with D rated tires so the weight rating of the tire wouldn't be an issue.

Besides the favorable offset, the only other difference seems to be the flat lug nut instead of an acorn nut, and I should be able to find an acorn
nut with the SAE threads of the motorhome lugs.

--
Todd Snyder, Buffalo NY
1976 Eleganza II
 
GM put wheels on the coaches to intentionally overhang the brake calipers
and rotors to keep the front end width as narrow as possible. If you would
like to be introduced to a phenomenon known as torque steer, just put a set
of 101.6 mm (4") wide spacers on the front. Will your offset wheels
introduce a similar phenomenon? I cannot predict that yours will, guess it
is a try and see deal. But, to get you to a safe haven when you have a
flat, really short distances at slow speed, it might work.
Jim Hupy
Salem, Oregon.

On Thu, Jun 20, 2019, 7:22 PM Todd Snyder via Gmclist <

> Not sure what to tell you, it fits fine on the front and turns freely.
>
> There's no interference with the front disk brake calipers. Actually
> there's much more clearance b/c the bolting flange is near the center of the
> tire instead of having the rim pushed in around the caliper and the
> bolting flange at the outside plane of the tire. Tons of room around the
> brake
> caliper.
>
> On the'76 GMC the hub center measures 115.8 mm with my Mitutoyo dial
> calipers. (I just went out in the rain and measured) and '97 GMC 8 lug
> rims are
> listed as having a bore of 116 mm. And I physically put a '97 rim on the
> '76 and it appears to be an appropriate fit at the hub. The center hole is
> the same diameter.
>
> The '97 GMC is listed as having an 8 on 165.1 mm bolt pattern. That's
> exactly 8 on 6.5", same bolt pattern.
>
> I would carry an E rated tire as a spare, the motorhome came with D rated
> tires so the weight rating of the tire wouldn't be an issue.
>
> Besides the favorable offset, the only other difference seems to be the
> flat lug nut instead of an acorn nut, and I should be able to find an acorn
> nut with the SAE threads of the motorhome lugs.
>
>
>
>
>
>
>
> --
> Todd Snyder, Buffalo NY
> 1976 Eleganza II
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
 
I believe the lug bolts are 9/16" fine thread. The conical shaped lug nuts should be a common item on the 8-lug GM and Dodge trucks. In fact, the
lug nuts from your suburban will probably fit perfectly.

I have been running 16" X 8" Dodge truck wheels on the front of my coach for about nine years now with conical nuts torqued to 140 ft lbs. I carry a
16" drop center Eagle (same as my mid and rear wheels) as a spare. I have never had to use it on the front, but I'm guessing it won't cause TOO much
weird handling. It shouldnt be a problem, at least until I can get a new front tire.
--
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles,
Solar battery charging. GMCSJ and GMCMI member
 
What you have there is a true lug centered wheel with those conical nuts. People call things like Eagle wheels on a GMC lug centered and they are
really not. You can get those nuts at most good auto parts stores. I believe they are 9/16"x18 . You might want to look up something that uses them
and see what the torque should be. I think 140 is a bit much, but what do I know
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
 
140 probably IS a bit too much, but IIRC, 135 is the Dodge spec on the allow wheels I am using.
--
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles,
Solar battery charging. GMCSJ and GMCMI member
 
> What you have there is a true lug centered wheel with those conical nuts. People call things like Eagle wheels on a GMC lug centered and they are
> really not. You can get those nuts at most good auto parts stores. I believe they are 9/16"x18 . You might want to look up something that uses
> them and see what the torque should be. I think 140 is a bit much, but what do I know

If we were talking about Alcoa wheels, then 140 is the correct number. That value is stamped right on the Lug Nut that have a Pressed In Washer.
--
Richard
76 Palm Beach
SE Michigan
www.PalmBeachGMC.com


Coop Roller Cam 455, Howell TBI + EBL, 3.42 FD, Quadra Bag, Macerator, Lenzi stuff, Manny Tranny etc.
 
> > What you have there is a true lug centered wheel with those conical nuts. People call things like Eagle wheels on a GMC lug centered and they
> > are really not. You can get those conical nuts at most good auto parts stores. I believe they are 9/16"x18 . You might want to look up
> > something that uses them and see what the torque should be. I think 140 is a bit much, but what do I know
>
> If we were talking about Alcoa wheels, then 140 is the correct number. That value is stamped right on the Lug Nut that have a Pressed In Washer.

The torque needed to achieve the correct clamping force is influenced buy the type of nut, and if applicable washer, used and the surface area it
contacts. That is why I suggested that he find the correct torque for this type of lug centered wheel with conical nuts. You do not want to stretch
or break the studs.

--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
 
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