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10-29-2024, 07:32 PM
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#1
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Senior Member
Tiffin Owners Club
Join Date: Oct 2020
Location: Melbourne, FL
Posts: 116
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Tiffin Bus Weight Correct???
I took our 45 BTP to a CAT scale today to get a correct weight on each axle. The people at the scale were not the sharpest on the planet so I am trying to verify the weight prior to a 900 mile trip.
If you have weights on your bus would you please let me know if these look about right. I was especially concerned on the steer axle because the weight exceeds any of the numbers on the Michelin tire chart.
My numbers are:
Steer Axle - 17,700 lbs - beyond the numbers for 315/80 R 22.5 tires
Drive Axle - 20,580 lbs
Tag Axle - 7540 lbs
Thanks for your input!
__________________
Paul, Emily & Darla Mae (JRT)
2025 Tiffin Allegro Bus 45BTP
2019 Jeep Wrangler Sport 2 Dr
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10-29-2024, 09:46 PM
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#2
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Senior Member
Tiffin Owners Club
Join Date: May 2019
Location: SW Ohio
Posts: 754
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Quote:
Originally Posted by Laserchrome
I took our 45 BTP to a CAT scale today to get a correct weight on each axle. The people at the scale were not the sharpest on the planet so I am trying to verify the weight prior to a 900 mile trip.
If you have weights on your bus would you please let me know if these look about right. I was especially concerned on the steer axle because the weight exceeds any of the numbers on the Michelin tire chart.
My numbers are:
Steer Axle - 17,700 lbs - beyond the numbers for 315/80 R 22.5 tires
Drive Axle - 20,580 lbs
Tag Axle - 7540 lbs
Thanks for your input!
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Based on the published specs, you are within spec for each axel. The front has an 18,000 max weight. Might see what weight you can move rearward.
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10-29-2024, 10:02 PM
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#3
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Senior Member
Monaco Owners Club Freightliner Owners Club Holiday Rambler Owners Club
Join Date: Sep 2019
Location: Thornville, Ohio
Posts: 3,973
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The chart I looked at has the max load for 315x80x22.5r as 9,090 per tire or 18,180 per pair at 130 psi. It looks like it's within specs, but I would not want to be that close to specs. Maybe less water?
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Art & Joyce
Thornville, OH
Kia Soul pushing a 36' DP Endeavor
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10-29-2024, 11:42 PM
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#4
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Senior Member
Join Date: Mar 2019
Posts: 6,629
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Quote:
Originally Posted by ArtJoyce
The chart I looked at has the max load for 315x80x22.5r as 9,090 per tire or 18,180 per pair at 130 psi. It looks like it's within specs, but I would not want to be that close to specs.
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Confirmed. That would be a problem. Since late 2018 the RVIA has required tires with at least a 10% margin over GAWR. If that is an 18,000 lb GAWR axle then those tires are the wrong load range.
That's a warranty write-up if that coach has the normally-useless RVIA sticker on it. This may be the first time in history it has some value.
Laserchrome, what does the inside sticker say the front axle tire pressure should be, and does it list that tire size?
If it does not say 130 lbs for that 315 tire size then Tiffin is going to have another recall for an inaccurate tire sticker.
Ray
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2020 Forest River Georgetown GT5 34H5
2020 Equinox Premier AWD 2.0L/9-speed
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10-30-2024, 08:32 AM
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#5
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Senior Member
Tiffin Owners Club
Join Date: Jun 2017
Location: Odessa, FL
Posts: 901
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My weights
RF = 7900
LF = 8800
Total = 16,700
RR = 9400
LR = 9250
Total = 18,650
RT = 3700
LT = 3700
Total = 7,400
This was with full tanks of water and diesel, tools, Blackstone, tables, chairs, spare DEF and Aqua Hot fluid, you get the idea, fully loaded for a long trip.
I should get it weighted again though, I recently had the wine cooler removed.
__________________
2023 Tiffin Allegro Bus 45OPP
2019 Birkshire 34QS - Traded
2020 Jeep Cherokee Trailhawk with BlueOx/AF1
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10-30-2024, 08:37 AM
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#6
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Member
Official iRV2 Sponsor
Tiffin Owners Club
Join Date: Aug 2024
Posts: 188
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Quote:
Originally Posted by Laserchrome
I took our 45 BTP to a CAT scale today to get a correct weight on each axle. The people at the scale were not the sharpest on the planet so I am trying to verify the weight prior to a 900 mile trip.
If you have weights on your bus would you please let me know if these look about right. I was especially concerned on the steer axle because the weight exceeds any of the numbers on the Michelin tire chart.
My numbers are:
Steer Axle - 17,700 lbs - beyond the numbers for 315/80 R 22.5 tires
Drive Axle - 20,580 lbs
Tag Axle - 7540 lbs
Thanks for your input!
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From the information you have provided it looks like you are good to go. If you would be willing to reach out to some of our PowerGlide techs they can assist you in possibly shifting some of the front axle weight back to the rear. There is a chart on the Michelin website also that is very helpful.
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10-30-2024, 09:19 AM
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#7
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Senior Member
Tiffin Owners Club
Join Date: Oct 2020
Location: Melbourne, FL
Posts: 116
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Thanks for all the input. Being that close to the max weight caused concern. I have the coach fully loaded, so water, grey and black tanks were full. I always travel with the grey and black empty to that will save a bit of weight. I was surprised at 130 psi in the front tires, but it is what it is.
We are leaving Lancaster, PA on Friday and heading for Red Bay. A long drive and wanted to make sure all was correct. Everything is a big change from our 21 RED mostly all in a good way. Again Thanks!
__________________
Paul, Emily & Darla Mae (JRT)
2025 Tiffin Allegro Bus 45BTP
2019 Jeep Wrangler Sport 2 Dr
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10-30-2024, 09:56 AM
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#8
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Senior Member
Join Date: Mar 2024
Location: Bohemia NY
Posts: 759
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Quote:
Originally Posted by Laserchrome
Thanks for all the input. Being that close to the max weight caused concern. I have the coach fully loaded, so water, grey and black tanks were full. I always travel with the grey and black empty to that will save a bit of weight. I was surprised at 130 psi in the front tires, but it is what it is.
We are leaving Lancaster, PA on Friday and heading for Red Bay. A long drive and wanted to make sure all was correct. Everything is a big change from our 21 RED mostly all in a good way. Again Thanks!
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Why would you ever have the fresh water, grey and black tanks filled at the same time? The grey and Black tanks are sized to take the contents of the fresh and hold it with some added waste. Design is that the fresh water wight is transferred as it is being used. However, most likely most of that weight goes to the rear axle. Maybe that coach needed the 20,000-pound front axle or the weight distribution changed to use more of the rear-tag capacity.
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Dennis
Bohemia NY
2008 Nimbus 342 SE Carlyle
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10-30-2024, 10:06 PM
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#9
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Senior Member
Tiffin Owners Club
Join Date: Oct 2020
Location: Melbourne, FL
Posts: 116
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So, I filled the 3 tanks because it was the easiest way I could think of to add some extra insurance weight to the center of the bus. I could have just upped the weights by 5%...
On the disappointing side, I needed 130 psi in the front tires but the air compressor in the bus only goes to 125 psi. Sometimes you can't catch a break.
__________________
Paul, Emily & Darla Mae (JRT)
2025 Tiffin Allegro Bus 45BTP
2019 Jeep Wrangler Sport 2 Dr
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10-30-2024, 10:28 PM
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#10
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Senior Member
Join Date: Mar 2024
Location: Bohemia NY
Posts: 759
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Quote:
Originally Posted by Laserchrome
So, I filled the 3 tanks because it was the easiest way I could think of to add some extra insurance weight to the center of the bus. I could have just upped the weights by 5%...
On the disappointing side, I needed 130 psi in the front tires but the air compressor in the bus only goes to 125 psi. Sometimes you can't catch a break.
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You may want to reach out to the folks at Tiffin. My bet is that the compartments are not designed for this and it can damage the basement compartment structure especially if the coach is driven this way. As a consideration if the coach is used in winter you don't want to drive it with frozen snow on the roof. Both are forms of abuse that insurance will not cover.
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Dennis
Bohemia NY
2008 Nimbus 342 SE Carlyle
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10-31-2024, 12:31 PM
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#11
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Senior Member
Tiffin Owners Club
Join Date: Jun 2017
Location: Odessa, FL
Posts: 901
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Quote:
Originally Posted by Laserchrome
So, I filled the 3 tanks because it was the easiest way I could think of to add some extra insurance weight to the center of the bus. I could have just upped the weights by 5%...
On the disappointing side, I needed 130 psi in the front tires but the air compressor in the bus only goes to 125 psi. Sometimes you can't catch a break.
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Invest in a Viair 450P-Automatic Portable Air Compressor...
__________________
2023 Tiffin Allegro Bus 45OPP
2019 Birkshire 34QS - Traded
2020 Jeep Cherokee Trailhawk with BlueOx/AF1
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10-31-2024, 02:53 PM
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#12
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Senior Member
Tiffin Owners Club
Join Date: Oct 2020
Location: Melbourne, FL
Posts: 116
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Quote:
Originally Posted by shepardmike
Invest in a Viair 450P-Automatic Portable Air Compressor...
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That's a really good suggestion but no VIAIR products to be found in Lancaster, PA. I felt lucky to find a portable 150psi Pittsburg Automotive 12V at Harbor Freight. Yes, I know... Harbor Freight but I'm leaving in the morning so ready to try anything.
It was not a bad compressor and it did pump the front tires to 130 psi in about 5 minutes without even getting very hot. Hey, for $74.95 it got the job done.
Let the big drive begin!
__________________
Paul, Emily & Darla Mae (JRT)
2025 Tiffin Allegro Bus 45BTP
2019 Jeep Wrangler Sport 2 Dr
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11-01-2024, 01:14 PM
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#13
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Senior Member
Tiffin Owners Club
Join Date: Mar 2012
Posts: 1,811
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I understand the intention of having the loaded extra weight of the full black and grey tanks to get maximums of your weight, but as already mentioned, the full fresh water tank just transfers to the black and grey tanks through usage. Having a full fresh water tank and black and grey tanks is adding close to an extra thousand pounds.
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Dewey & Sharon
Southern Maryland suburbs of DC
2022 Tiffin Allegro Bus 40IP
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11-01-2024, 04:14 PM
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#14
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Senior Member
Join Date: Mar 2024
Location: Bohemia NY
Posts: 759
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Inflating tires safely
It should be noted that inflating tires, especially those on RV's and trucks can be hazardous. There are actually OSHA requirements for handling tires that are not passenger car or light truck applications. Here are the regs.
https://www.osha.gov/laws-regs/regul.../1910/1910.177
Note the inflation on the vehicle is covered and the requirements that the air supply is regulated and remotely controlled.
Dennis
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Dennis
Bohemia NY
2008 Nimbus 342 SE Carlyle
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