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Topic: 295 tires vs 275 tire on 1998 foretravel 40ft (Read 1513 times) previous topic - next topic

295 tires vs 275 tire on 1998 foretravel 40ft

I can not get the Michelin xse 275 h rated tires here in Canada anymore.  Is anyone running the 295 tires on the rear single axle with no issues such as rubbing  etc?
Peter    Alberta Canada
'98 U320 40'  Build 5359 M11 450 HP, Aqua hot, Blu Ox

Re: 295 tires vs 275 tire on 1998 foretravel 40ft

Reply #1 –
I run them front and back.......no issues.
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Lynn & Marilyn Sickel
Tollville, AR
1997  U320  40'
2021 Chevrolet Silverado pickup
Motorcader  17257

Re: 295 tires vs 275 tire on 1998 foretravel 40ft

Reply #2 –
Peter,  295 75R 22.5 tires are with on one tenth of an inch in diameter of 275 80R 22.5.  Both have run fine in my coaches.

If you want the Michelin brand tires, Call Dave Ward, 32 one  6 zero 7  2265.  He is a Michelin reseller and has found tires when dealers say there are none.  He is in Florida and will share how being in Canada impacts his sourcing tires.

Rudy Legett
2003 U320 4010 ISM 450 hp
2001 U320 4220 ISM 450 hp
1995 U320 M11 400 hp
1990 Granvilla 300 hp 3208T
Aqua Hot Service Houston and Southeast Texas

Re: 295 tires vs 275 tire on 1998 foretravel 40ft

Reply #3 –
I'm running 295/75R22.5 Toyo on 36' 98 U270 with no interference issues. Many others are as well.

1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.

Re: 295 tires vs 275 tire on 1998 foretravel 40ft

Reply #4 –
To make comparisons valid, please specify:

275/80R22.5
vs
295/75R22.5
OR vs
295/80R22.5

Just saying 295 doesn't really address the issue.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: 295 tires vs 275 tire on 1998 foretravel 40ft

Reply #5 –
295/75R22.5 are within one revolution per mile compared to a 275/80R22.5. The 295 is about.0.79 inches wider. All things equal, the wider tire will stop shorter and handle better. Probably not a factor but the 295 is a lower profile tire so in case of a blowout, there is less distance between the aluminum wheel and the road. 295/75-R22.5 vs 275/80-R22.5 Tire Comparison - Tire Size Calculator | Tacoma...

If you decide on a 295, regional or bus/OTR use (most RV manufactures recommend regional), load rating and speed rating are specifications to consider.

We have 295s on our 1993 U300. Love them.

Pierce
Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)

Re: 295 tires vs 275 tire on 1998 foretravel 40ft

Reply #6 –
Running the 295/75R22.5 size on our rig with no problems
Bob and Pam Brumbaugh
Ernie (English Bulldog)
2000 U320 WTFE 40' Build # 5740 (former)
Xtreme "Lights and Paintjob"
Motorcade# 18659
Souderton, PA
Towd: 2021 Ford Ranger
Quickee Mini Golf Cart (former)

We Are....Penn State!

Re: 295 tires vs 275 tire on 1998 foretravel 40ft

Reply #7 –
Pierce,
I think they are so close to the same size that it makes no measurable difference.
295 x .75 = 221.5 mm between the rim and the road
275 x .80 - 220 mm

1.5 mm difference x 2 would make the 295/75 about 3mm larger in diameter than the 275/80
Justin & Cathy Byrd
1995 U280 "Old Faithful"
36' Build #4673
C8.3 Cummins
Allison MD3060R 6 speed - retarder
Powertech 10KW  4cyl Kubota

Re: 295 tires vs 275 tire on 1998 foretravel 40ft

Reply #8 –
Quote from: FourTravelers –
Pierce,
I think they are so close to the same size that it makes no measurable difference.
295 x .75 = 221.5 mm between the rim and the road
275 x .80 - 220 mm
1.5 mm difference x 2 would make the 295/75 about 3mm larger in diameter than the 275/80
Yes, the numbers are in the site I linked to: 295/75-R22.5 vs 275/80-R22.5 Tire Comparison - Tire Size Calculator | Tacoma...  As you say, not much difference and one manufacture to another may be as great as this. We occasionally get a very slight contact with the right bag in off road slow turns on uneven ground but nothing significant.

Pierce
Pierce and Gaylie Stewart
'93 U300/36 WTBI
Detroit 6V-92TA Jake
1140 watts on the roof
SBFD (ret)

Re: 295 tires vs 275 tire on 1998 foretravel 40ft

Reply #10 –
295/75/22.5 came on my coach and when it's time to buy I will get the same.
Peter and Frieda Morin
1999 36ft. U320 Foretravel
Build # 5436
1998 Suzuki Sidekick Sport
 

Re: 295 tires vs 275 tire on 1998 foretravel 40ft

Reply #11 –
OK, one suggestion-- applies to all coaches, but is especially important when fitting a wider tire (even a little wider):

Check and adjust CUT-ANGLES.  Very easy to do.  Special tools needed: Small standard screwdriver and something to measure a small gap-- I use an old scrap of 1/8" thick aluminum about 6" long. Also a wrench to adjust the physical/mechanical stop.

Why did I say applies to all coaches-- easy.  All of us want the max cut angle without allowing the tires or wheels to contact body or suspension components and more critically, so that the Sheppard steering box does not "keep working" against a mechanical stop, as this shoots hydraulic pressure way up and is often the cause of blown seals in the steering box.

This takes two people-- one to turn the steering wheel and another to check clearances and make adjustments.  The adjustments are done on the two tiny exterior screws on the Sheppard box-- one on top, one on the bottom where it is easier to see.  Each limits cut angle in one direction.  Screwing them in reduces cut angle, out increases it.

Coach needs to be at standard ride height (a good time to check) and reasonably level.  Running the front wheels up on 2 stacked 2X12"s should give you safety clearance.  If you are "thicker" use three! Easier for the helper to turn the steering wheel with the engine running/power steering.

When set up correctly, the Sheppard box (with properly adjusted screws) will not allow the tires/wheels to contact body, chassis or suspension components AND also for there to be an air gap between the mechanical stop (the bolt) on the steering knuckle.

Have the helper turn the wheel all the way to the lock on one side.  Verify both clearance for tire/wheel and about 1/8" on the mechanical stop.  If there is too much gap/reduced cut angle, screw out one of the adjusting screws on the Sheppard box.  Easy to  verify whether top or bottom screw is the one to use for that side-- just screw it in or out 2 full turns and see if it affected the side you are working on.  Return to initial screw location. On our coach I gained 7 degrees on one side and a whopping 10 degrees on the other.  Since this was the OE steering box and had never been adjusted after it left the factory, it meant  it was not dialed in at the factory.  Appreciated those extra few degrees each time  I had to maneuver.

This IS CRITICAL anytime you change tire width or the steering box is removed for any reason.  Do not count on whoever works on the box to return the cut angle screws to exactly their original position OR assume this was dialed in at the factory.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020