Home » Public Forums » GMCnet » 9.5 x 16.5 ties on my 75 Glenbrook (Mixing Tire sizes)
| 9.5 x 16.5 ties on my 75 Glenbrook [message #313085] |
Sun, 12 February 2017 19:12  |
Glenbrook75
Messages: 46
Registered: January 2017
Location: Dauphin, Manitoba
Karma: 0
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My new coach came with 9.5 instead of the recommended 8.75 x 16.5 tires they are all in decent shape except one front tire that needs to be replaced I am thinking of replacing both front tires with 8.75 and leaving the back for now. I would like to get the aluminum wheels but I only have so much to spend and I want to be sure I have no major mechanical issues before I get to things like new rims. I am wondering if mixing the sizes would be a problem or if I should just buy one new 9.5 for now. Any suggestions
Terry
75 Glenbrook
Dauphin, Manitoba
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| Re: 9.5 x 16.5 ties on my 75 Glenbrook [message #313087 is a reply to message #313085] |
Sun, 12 February 2017 19:53  |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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Glenbrook75 wrote on Sun, 12 February 2017 19:12My new coach came with 9.5 instead of the recommended 8.75 x 16.5 tires they are all in decent shape except one front tire that needs to be replaced I am thinking of replacing both front tires with 8.75 and leaving the back for now. I would like to get the aluminum wheels but I only have so much to spend and I want to be sure I have no major mechanical issues before I get to things like new rims. I am wondering if mixing the sizes would be a problem or if I should just buy one new 9.5 for now. Any suggestions Mixing sizes side to side on the front would be a problem (would ruin the final drive). Mixing sizes on one or two of the rears might mean you would have to set rear ride height manually to keep the frame the right distance from the ground to not mess up steering/handling. It might not be wonky enough to matter, but if it is, you will know it.
Your spare will need to be the same as the front. Since you have a different size on the front than the rear, if you have a flat on the rear, you will have to set rear ride height manually until you get someplace where you can get the tire situation sorted back out.
A hassle, but manageable.
[Updated on: Sun, 12 February 2017 19:54] Report message to a moderator |
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| Re: [GMCnet] 9.5 x 16.5 ties on my 75 Glenbrook [message #313107 is a reply to message #313090] |
Mon, 13 February 2017 06:59 |
Kingsley Coach
Messages: 2691
Registered: March 2009
Location: Nova Scotia Canada
Karma: -34
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Terry
Check with Mackie? Love in your area. He may have left over GMC stuff,
possibly 16" steel wheels . You don't know unless you check.
The last time I was in Dauphin his was parked by his house but I believe
he has sold since then.
Mike in NS
On Sun, Feb 12, 2017 at 9:54 PM, Emery Stora wrote:
> As long as you have both tires on the front the same size it should be OK.
>
> Not as critical on the back as they are not connected.
>
> Emery Stora
> 77 Kingsley
> Frederick, CO
>> On Feb 12, 2017, at 6:12 PM, Terry wrote:
>>
>> My new coach came with 9.5 instead of the recommended 8.75 x 16.5 tires
> they are all in decent shape except one front tire that needs to be
> replaced I
>> am thinking of replacing both front tires with 8.75 and leaving the back
> for now. I would like to get the aluminum wheels but I only have so much to
>> spend and I want to be sure I have no major mechanical issues before I
> get to things like new rims. I am wondering if mixing the sizes would be a
>> problem or if I should just buy one new 9.5 for now. Any suggestions
>> --
>> Terry
>> 75 Glenbrook
>> Dauphin, Manitoba
>>
>> _______________________________________________
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--
Michael Beaton
1977 Kingsley 26-11
1977 Eleganza II 26-3
Antigonish, NS
Life is too short to hold a grudge; slash some tires and call it even !
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| Re: 9.5 x 16.5 ties on my 75 Glenbrook [message #313129 is a reply to message #313085] |
Mon, 13 February 2017 09:42 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Terry,
I am remiss. I only just now noticed that you are new here.
Welcome to the group, family, cult, asylum...
As you have already discovered, this is a community like few others. These are wonderful helping and very supportive people. It is a really great place to be. And when you get to a rally, you will also find that you have acquired a large collection of brand new old friends. The only other community that I know of that is at all like this is that of the watermen that are my world. For that reason, I have taken to welcoming new owners here much as any new owner or vessel would be welcomed there. So,
May the Good Lord bless this coach and all those that set forth within here.
Welcome Terry
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: 9.5 x 16.5 ties on my 75 Glenbrook [message #313135 is a reply to message #313085] |
Mon, 13 February 2017 11:45 |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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Matt Colie wrote on Mon, 13 February 2017 09:47Terry,
I was indeed. At one time I had 225-16 on the front and all 8.75-16.5 on the rear. Then, I had the 16s on the front and middle and 16.5 on the rear. And for a short drive (200 miles), the rear was a 3:1 mix because the spare was/is a 8.75-16.5.
There were no handling issues.
Matt You weren't actually driving with different size wheels. The difference in diameter between 8.75R16.5 tires and 225/75R16 tire is negligible.
The difference between 9.5R16.5 and 8.75R16.5 tires is NOT negligible (at least side-to-side on the front/drive axles).
Terry,
Matt could have probably gotten away with mixing side-to-side, even on the front. You will muck up the final drive if you do that with one 9.5R16.5 wheel on one side of the front and either an 8.76R16.5 or a 225/75R16 wheel on the other front wheel.
Mixing side-to-side, or mid and rear, on the back may or may not be noticeable in the handling, but you won't muck up the final drive.
I would guess as long as you have the same size on each side-to-side pair, you will be fine. You might even get away with one odd size different than the other three on the rear.
DO NOT mix sizes from one side to the other on the front.
Your spare should be the same size you run on the front, in case you get a flat on the front.
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| Re: 9.5 x 16.5 ties on my 75 Glenbrook [message #313142 is a reply to message #313085] |
Mon, 13 February 2017 13:19 |
Tilerpep
Messages: 404
Registered: June 2013
Location: Raleigh, NC
Karma: 7
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I am hoping you have already included the tire age in your assesment of them looking "decent". The problem for our coaches is if they blow, the debris (especially if still attached and spinning) tears off much more body work than the cost of tires. Much has been written on this forum about tires aging out before wearing out. Five years is the preferred replacement age, each year past that has fewer advocates. I just bought a coach with seven BFGoodrich tires, three dated 2006, four dated 2011. It is killing me to scrap tires that have less than a few hundred known miles on them. The 2006's will definitely not be put on the road, the 11's will probably be used to get it home. The date codes are at the end of the DOT sequence on the sidewall. If it says 2312, that is the 23rd week of 2012. Older tires do not always have four numbers, using a single digit for year.
1975 Glenbrook, 1978 Royale rear bath
Raleigh, NC
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| Re: 9.5 x 16.5 ties on my 75 Glenbrook [message #313147 is a reply to message #313085] |
Mon, 13 February 2017 14:45 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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To 'splian the problem, unequal diameter wheels/tires side to side means the whels turn at different speeds. On the back on a GMC it doesn't matter, because there's no connection from side to side. In front, you'll turn the axles at different speeds which will make the differential behave is though the coach is in a turn. It isn't designed to do this for any great length of time, or at any great speed. If you have a limited slip or 'locker' differential, you'll get it real hot real quick and it will fail shortly thereafter due to the unequal axle speeds. I carry two spares in the ratrod truck, the front and rears are different diameters so comes a flat I replace each side with identical spares.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: 9.5 x 16.5 ties on my 75 Glenbrook [message #313148 is a reply to message #313142] |
Mon, 13 February 2017 15:07 |
Glenbrook75
Messages: 46
Registered: January 2017
Location: Dauphin, Manitoba
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Checked with PO tires are past 10 years but he swear they will be fine I think I will replace front two and use the rest to get it home for now. I confess I never factored $ 3,000 for tires and rims into my budget. Good lesson for future.
Terry
75 Glenbrook
Dauphin, Manitoba
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| Re: [GMCnet] 9.5 x 16.5 ties on my 75 Glenbrook [message #313149 is a reply to message #313147] |
Mon, 13 February 2017 15:07 |
Mr ERFisher
Messages: 7117
Registered: August 2005
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Only costs $3,000to $ 6,000 to to repair the damage caused by a blow out
On Mon, Feb 13, 2017 at 12:46 PM Johnny Bridges via Gmclist <
gmclist@list.gmcnet.org> wrote:
> To 'splian the problem, unequal diameter wheels/tires side to side means
> the whels turn at different speeds. On the back on a GMC it doesn't matter,
> because there's no connection from side to side. In front, you'll turn
> the axles at different speeds which will make the differential behave is
> though the coach is in a turn. It isn't designed to do this for any great
> length of time, or at any great speed. If you have a limited slip or
> 'locker' differential, you'll get it real hot real quick and it will fail
> shortly thereafter due to the unequal axle speeds. I carry two spares in
> the ratrod truck, the front and rears are different diameters so comes a
> flat I replace each side with identical spares.
>
> --johnny
> --
> '76 23' transmode Norris upfit, 76 26' Eleganza(?) with beaucoup mods and
> add - ons.
> Braselton, Ga.
> "The road goes on forever, and the party never ends" --Robert Earl Keen
>
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--
Gene Fisher -- 74-23,77PB/ore/ca
“Give a man a fish; you have fed him for today --- give him a URL and
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Alternator Protection Cable
http://gmcmotorhome.info/APC.html
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| Re: 9.5 x 16.5 ties on my 75 Glenbrook [message #313151 is a reply to message #313085] |
Mon, 13 February 2017 15:27 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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He 'swears they're good' manufacturer says they're aged out. Who you gonna believe? Eagles from JimK, cooper Discoverer III LTs a bit under 2500 scoots all up. I only bought 6, take my chances with a steel rim for the spare.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: 9.5 x 16.5 ties on my 75 Glenbrook [message #313152 is a reply to message #313085] |
Mon, 13 February 2017 15:46 |
Tilerpep
Messages: 404
Registered: June 2013
Location: Raleigh, NC
Karma: 7
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Not knowing what your coach needs, your budget, and how you want to use it, it is hard to advise - but that hasn't stopped us before! I bought my first coach four summers ago. I put a full set of six Transforce 16.5 tires on it because i didn't know how much it was going to take to make the coach a runner again, nor how much my family would use it. We do use it quite a bit, I have restored the major systems, and will aim for 16 inch wheels and tires, two per year when I hit the five year mark on these tires. They will not be worn out.
I also have a 75 Glenbrook, and another consideration is that they had not switched to radial rated wheels by then. Ideally, you should only run the old bias ply tires on them. Very small risk of wheel welds actually separating with radial. You can look for a stamped "R" after the wheel code inside rim. That would indicate radial rated if the R is present. If no R, another reason to look for steel or alloy 16s. Steel 16s are available, you can search this forum (top right of page) for part numbers on used ones.
1975 Glenbrook, 1978 Royale rear bath
Raleigh, NC
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| Re: [GMCnet] 9.5 x 16.5 ties on my 75 Glenbrook [message #313153 is a reply to message #313148] |
Mon, 13 February 2017 16:05 |
Olly Schmidt
Messages: 1265
Registered: February 2014
Location: Germany and Scottsville, ...
Karma: 8
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Terry,
when I bought mine in San Diego I replaced all of the 16.5" tires on it.
Total cost was 1200+change. I didn't and don't see a need to change rims
as well. I see it different for a coach I am looking at to move to
Europe, as you can't get 16.5" tires in Europe (or at least nobody that
I know can find any).
--
Best regards
Peer Oliver Schmidt
PGP Key ID: 0x83E1C2EA
'76a Eleganza II, VA
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Best regards
Olly Schmidt
PGP Key ID: 0x18a9 3a1f 4196 bf22
'76a Eleganza II, VA
'73 Sequoia, SH, Germany
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