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M380 (Unique Issues) If you have a unique issue with your M380 model coach and it can't be answered in one of the other forums here, then this is where you can list it.....list your M380 Parts here too.

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  #11  
Old 08-13-2012
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Rick Rick is offline
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Let's let the M380 guys wake up. I'm sure the 315 size will fit your wheel width. Someone that has done this should be along soon.
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  #12  
Old 08-13-2012
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DonB DonB is offline
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Quote:
Originally Posted by hooverg View Post
Fits the stock wheel?
The 315 will fit on any standard Alcoa wheel from 8.25 inches up. It is an inch wider at the tread than a 12R, but within a tiny amount of being the same diameter, so it looks the same at the side and doesn't change ride height.
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  #13  
Old 08-13-2012
cmillsap
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Quote:
Originally Posted by hooverg View Post
I'm not familiar with the '315'. Is that just a tire or tire/wheel change or what exactly?
Garry,

Here's the specs comparing the 12R22.5 tire to the 315/80R/22.5. using a 315 tire will allow you to run 100#s on the steer instead of 115#s using the 12R. Those inflation rates work with a 14,600# axle. 15 less pounds in the front tires will definately make for a smoother and less hard or bumpy ride.

Chuck

I tried to copy the tables to this post but the numbers go vertical, so they may be easier to read by going to this website:

http://www.michelintruck.com/micheli...ion-tables.jsp


315/80R22.5 LRL XDN®2 GRIP, XDY® 3, XZA®1, XZA2® Energy™, XZY® 3
PSI

85


90


95


100


105


110


115


120


125


130


Maximum load & pressure on sidewall


LBS
Single

12830


13340


13880


14380


14880


15220


15840


16540


17620


18180


S


9090 LBS at 130 PSI

Dual

23360


24280


25580


26180


27080


27760


28840


30440


32040


33080


D


8270 LBS at 130 PSI


Dual

10600


11000


11600


11880


12280


12600


13080


13800


14480


15000


D


3750 KG at 900 kPa




12R22.5 LRH XDN®2, XDS®, XZE® *, XZY® 3
PSI

75


80


85


90


95


100


105


110


115


120


Maximum load & pressure on sidewall


LBS
Single

10400


10900


11380


12010


12410


12810


13220


13740


14260


14780


S


7390 LBS at 120 PSI

Dual

19960


20760


21560


22700


23140


23580


24020


25060


26100


27120


D


6780 LBS at 120 PSI


Dual

9040


9400


9760


10300


10520


10720


10900


11360


11840


12300


D


3075 KG at 830 kPa
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  #14  
Old 08-13-2012
Jim Brookshire Jim Brookshire is online now
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After traveling over about 3000 miles of roads in Canada and Alaska, some of which most WOG members probably wouldn't put their birds near, I have the following comments. We had two long Buses 43 ft. and two "short buses" M380 (Nancy and I ride the short bus). All seemed to handle the bad roads as well or better than anything we saw on the trip. Except for the 8 axle semi that blew by my Jeep on the gravel road to the artic circle. Comparisons between the short and tag axle buses (from my perspective - others might be different) were that:
1. washboard roads -- both were bad with maybe the big bus being better because of greater weight.

2. pot holes -- the same as washboard

3. whoop de doos (1 to 2 foot high frost heaves anywhere from 10 to 20 feet between -- M 380 takes these much better because of the IFS and lack of tag.

With that being said, If your M 380 front end is very stiff even with the shocks not installed, there is something stuck or binding. Unfortunately, there is nothing that affects the vertical travel of the front suspension that can be lubricated. Lubrication points are only in joints that steer the wheels not in the vertical travel joints i.e. A arms and ball joints.

I would suggest supporting the chassis high enough to get the front wheels off the ground, removing at least one front tire, and trying to raise the A arm with a jack (with no air pressure on the air bag). It should move thru 4 to 6 inches of vertical travel with no binding. A 1 to 2 ton roll around car jack should be sufficent.
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  #15  
Old 08-13-2012
Dan & Cindy Dan & Cindy is offline
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I replaced the 12R with 315 on my front wheels without any problems. I had two front curb side tires, one old and one new replacement, fail by separation in very short order after getting the coach. Been 20,000 miles since then without any problems.
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