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Old 01-17-2020, 11:47 AM   #1
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Join Date: Jul 2014
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2017 Allegro Bus Driveability

Hi all, we are the proud new( to us) owners of a 2017 40 SP Bus with very low miles so original tires. As I write this as we are on our return trip from picking it up in OKC on the road to PHX. We have had many rigs over the years and this is our first Tiffin, we really like everything about it! The weather on the return trip has been crazy all over the place, wind, rain, fog and almost snow:sad. The discussion we are having is...that we had hoped for better(quieter/less jarring) “road transitions”.
With the state of our country’s highways maybe it’s hopeless, short of a Newell or Prevost to not suffer from the constant slam, bang, crack from uneven and potted roads. Other than that major annoyance the rig drives and handles great...
Any suggestions that others have done to lessen the severity would be greatly appreciated espically by our Aussie Scout who Really hates it
We have checked the tire pressures and all are at optimal.

2017 Allegro Bus 40 SP
Doug, Robby and Scout
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Old 01-17-2020, 01:41 PM   #2
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Tiffin Owners Club
Join Date: Sep 2013
Location: DFW, Texas
Posts: 4,094
CONGRATULATIONS on the new to you coach and welcome to the Tiffin family. It really is a family!

First thing you need to do is get it weighed, preferably all four corners, then set the tire pressures accordingly. If you have them at the recommended pressures which are basically for the maximum load on the tires, then chances are that is too high for the actual weight. I was able to lower our pressures to 105 front and 100 rear from the 120 recommended. There are tons of discussions on here about tire pressures and ride. Like you said, unless you go to a Prevost or Newell you are never going to totally eliminate the roadway jars but you can minimize them some. We have the same chassis and even with the bumps in the road it is still much better than the Freightliner we used to have.

Dan & Ro with two Rescued Boston "Terrorists" Jade & Jewel
2017 Phaeton 40IH XSH Maroon Coral - Power Glide Chassis with IFS (05/17)
Previously '15 Tiffin Allegro RED 38QRA and '06 Itasca Sunrise 35A
'16 Jeep JKU Wrangler Sahara or '08 Honda Goldwing
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Old 01-17-2020, 01:51 PM   #3
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Freightliner Owners Club
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Location: Southern NM
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I agree with Dan, tire pressure makes a world of difference. We run 106 in the front and 96-100 in the rears.
Our bus rides much better than our Phaeton did.
Our dog loves to ride, stays up front to watch for cows etc to bark at
If you just picked up the bus, there is a good chance the tires are way overinflated for the weight you have now.
when I picked up our bus, the tires were all at around 120 psi.
2018 Allegro Bus 37AP
2014 Phaeton 40 QBH (sold)
2018 Jeep Recon
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Old 01-17-2020, 03:26 PM   #4
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Thanks guys! Unfortunately we are at 100 psi all around....so it’s most likely not that��
2017 Allegro Bus 40 SP
Doug, Robby and Scout
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Old 01-18-2020, 09:44 AM   #5
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Join Date: May 2018
Posts: 209
Like all above.

WEIGH the bus, then consult your tire chart for correct inflation. It’s never going to ride like a car, but I find mine rides best with a full tank of fuel to match suspension. We use less than half a tank most days but I still look for GOOD, reasonably price fuel each day.

I think my 40SP has 105 front 90 rear.

Drive axle 14440 lb, drive 22540 last weigh in at Cat scale. Cost $11.50.

Fuel tank full, 25 gallons fresh water.
Jeff Korn
2014 Tiffin Allegro Bus 40SP, 450HP
2015 Jeep GC, Air Force 1, Roadmaster Nighthawk
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Old 01-22-2020, 07:24 PM   #6
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Location: Polk City Florida
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Totally agree, When we road tested our 2017 Bus, I commented that I was feeling every pebble in the roads and was not happy and asked what the tire pressure was at. The dealer said 135 all around ????? HUH ? so on hot days it would climb to 150 + I had the coach weighed and now set at 105 front and 100 rears on our 40 AP

Don and Nancy
[2017 Tiffin Bus 40 AP, 2018 Jeep Unlimited Sahara JL 6yr old sisters Sara n Kaycee, Havanese, Two Electric Bikes
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