Forum Discussion

americanrascal's avatar
americanrascal
Explorer
Jan 06, 2015

Tire stuff -Mixed Spare tire- will it work

Recently we bought a new Itasca MH on an F53 chassis with GY G670 RV tires. Itasca doesn't crank out rigs in this model line with spare tires.(245 70R19.5)

Having had a Class A a few years back that seemed to enjoy blowing tires or having tires that fail, I want to always have spare handy- especially since we are running up the Alaska Hiway this coming summer.I recently purchased a wheel to mount a spare on this new rig.

My mind is saying to me don't spend big on this spare- just get something to get you to the next spot where you can have your G670 repaired or replaced. So I have been eyeballing a Sailun S637 which is significantly lower cost than a GY.

I see a bunch out there on these Sailun G670 tires for 5vers (smaller diameters) but not much about them for MH's.

Is this a practical tire for a MH spare? Any big issues with running an odd tire for a while until I can replace something in kind if I lost a GY G670 assuming same load range?

Do these tires work well permanently mounted?

Would appreciate some outside thinking guidance here about this.

Thanks
Rascal
Class A
  • Ductape's avatar
    Ductape
    Explorer
    Jan 06, 2015
    Sure it will work. I went the other way and bought a Toyo spare because that is what I will replace any failing GY with.
  • Effy's avatar
    Effy
    Explorer II
    Jan 06, 2015
    Since you plan on buying an exact replacement anyway, why would you buy a different tire, and then buy the replacement also. Why not just carry the replacement? You're not going to save any noticeable weight, time or effort in swapping them and you would certainly spend more money buying 2 tires instead of one. Am I missing something?
  • darsben's avatar
    darsben
    Explorer II
    Jan 06, 2015
    Effy wrote:
    I wouldn't buy a tire, spare or otherwise that wasn't rated for your MH. And it's probably not good to mix brands if you don't have to. Since you plan on buying an exact replacement anyway, why would you buy a different tire, and then buy the replacement also. Why not just carry the replacement? You're not going to save any noticeable weight, time or effort in swapping them and you would certainly spend more money buying 2 tires instead of one. Am I missing something?


    If the guy is lucky and takes care of his tires the spare will probably never see the ground. It would be a shame to spend big bucks just in case. I understand his thinking
  • JimM68's avatar
    JimM68
    Explorer
    Jan 06, 2015
    It's possible I haven't been paying attention, but I'm not aware of any fivers using 19.5 inch tires?

    For a temporary spare, the important thing is the diameter. Measure your existing tires, and shop local truck tire shops to find a used tire that is close to the same diameter and not any wider. That will serve as your unmounted spare. Coachnet and other road service companies will be happy to mount this tire in an emergency.

    Unless your motorhome has a place to mount it, I would not consider a mounted spare, too heavy.
  • wa8yxm's avatar
    wa8yxm
    Explorer III
    Jan 06, 2015
    You can use a low-rent spare so long as it's the same size.. Just remember SPARE, Low Rent, Get ye to a tire dealer for a proper replacement only use.

    In fact,, Many cars were shipped with "Donut" spares,, sure fit that description.
  • americanrascal's avatar
    americanrascal
    Explorer
    Jan 06, 2015
    Effy wrote:
    Since you plan on buying an exact replacement anyway, why would you buy a different tire, and then buy the replacement also. Why not just carry the replacement? You're not going to save any noticeable weight, time or effort in swapping them and you would certainly spend more money buying 2 tires instead of one. Am I missing something?


    Haven't totally convinced myself to go with Goodyears down the road- they sure are pricey. The Goodyears are brand new now and I only want a spare at the moment. I expect all the tires (new spare included ) to age out about the same time.
  • americanrascal's avatar
    americanrascal
    Explorer
    Jan 06, 2015
    JimM68 wrote:
    It's possible I haven't been paying attention, but I'm not aware of any fivers using 19.5 inch tires?

    For a temporary spare, the important thing is the diameter. Measure your existing tires, and shop local truck tire shops to find a used tire that is close to the same diameter and not any wider. That will serve as your unmounted spare. Coachnet and other road service companies will be happy to mount this tire in an emergency.

    Unless your motorhome has a place to mount it, I would not consider a mounted spare, too heavy.


    Yes you are correct, but I have seen Sailun S637's referred to in smaller size being used on 5vers.

    I did get a used wheel for this but don't really want to go down the used tire road. All that said I'd like to save a buck with a new tire for a spare that might never be used. I have not seen any info yet on overall difference in outside diameter (or revolutions per mile) looking at different makes so i am hoping they are all pretty close.
  • John_Wayne's avatar
    John_Wayne
    Explorer II
    Jan 06, 2015
    The only time you'd have to worry about diameter is if your flat was one of the duals. Front tire flat wouldn't be a problem. So if your flat was on a dual axle put the smaller diameter tire on the front and take the front and put it at the dual flat location.
    Then if you had to buy a new tire it would be on the front to replace the smaller spare. The new tire could have a larger diameter depending on how many miles the duals had on them when you had to replace it.
  • americanrascal's avatar
    americanrascal
    Explorer
    Jan 06, 2015
    John Wayne wrote:
    The only time you'd have to worry about diameter is if your flat was one of the duals. Front tire flat wouldn't be a problem. So if your flat was on a dual axle put the smaller diameter tire on the front and take the front and put it at the dual flat location.
    Then if you had to buy a new tire it would be on the front to replace the smaller spare. The new tire could have a larger diameter depending on how many miles the duals had on them when you had to replace it.


    Thanks John- that works

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