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Old 02-26-2009, 02:12 PM   #1
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Okay I finally did it. I took the coach in and had it weighed over the weekend.

Front Axle 6,820
Rear Axles 12,980
Tire Size: 235/80 (Michelins)22.5

Tire chart if I'm doing this all correctly and that's what concerns me says 75 in the front and 73 for the Dullies. Can that be right?

Divided the front by 2 and the rear number by 4.

GVWR 22,000
Front: 7,500
Rear: 14,500

Can someone check my math please, Thanks
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Old 02-26-2009, 03:26 PM   #2
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These numbers are similar to what I found, I drove on these pressures for a short trip, didn't like them...80 fronts 75 rears...have since moved them up to 85 fronts 80 rears...much better. I do have 19.5" Goodyears.

I think you need a fudge factor.

Here was my post on the subject, FWIW.
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Old 02-26-2009, 03:26 PM   #3
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Sounds about right... I'm at 80 all around but I need to re-weigh mine... I put it on a diet and I'm sure it lost a bunch of unneeded weight.
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Old 02-26-2009, 03:42 PM   #4
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You really need 4 corner weights. For example, if your front axle is really split 3600/3220, you need to use the pressure for 3600 on both sides.

If you get accurate 4 corner weights, you don't need a fudge factor.

joe
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Old 02-26-2009, 04:33 PM   #5
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When you use the divide by 2 or 4 method, round up to the next tier in the tire pressure table to allow for side-to side imbalance. Round up two tiers if you were real close to a boundary in the table.

Remember also that duals use a different slot in the table, i.e. they carry less weight per tire than the fronts.

Your pressures sound about right to me.
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Old 02-26-2009, 11:47 PM   #6
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Thanks for all the replies. Wish I could get a four corner weight but that's impossible where we are right now. Only scale we have is "Move it up on there Fleetwood", then "Okay Fleetwood, Move it Outta here and come in and pay"

Again, thanks we'll get this figured out and I'll tell you what I did
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Old 02-28-2009, 04:21 AM   #7
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Quote:
235/80 (Michelins)22.5
I would stick with 80 lbs. or above for your coach
load range. Fleetwood put mine at 90lbs. I have a similar coach which weighed in at 18470lbs. When each tire was weighed at fleetwood the right side was 200 - 300 lbs more then the left. I believe the tires have a 110 lb rating.
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Old 03-01-2009, 01:13 AM   #8
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The fronts had 90lbs in them and the rears had 85. I left the 85 in the rear and took the front down to 80 from 90 and the ride is a lot better than it was before, although I wasn't complaining about the ride. It just seems smoother now, less roll and less play.
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Old 03-28-2009, 11:10 AM   #9
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Weighing four corners will only tell you if you need to shift weight around if you can.
Whatever corner on the front or rear that has the highest weight is what you need to inflate your tires too. IMHO, if you have front and rear axel weigh this is close enough...I like a fudge factor regardless just incase for whatever reason you add weight that wasn't there when you weighed the unit. The fudge factor doesn't seem to effect the ride that much...I run 90 on the front and 85 in the rear. Good Miles to all.
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