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Changing tires

Yahoo Message Number: 78234
Due to an alignment problem that went undetected (shame on me) I am now in the process of changing front tires. My dealer installed Michelin XZEs and after a short trip they are unacceptable. Lots of road force. So, he agreed to install 295/80/22.5 XZA2s. This tire is smaller in diameter by 1.3 inches and by 17 RPMs. Thus a change will be required in the speedo/odometer. Is this a dip switch change in the speedo or an ECM change? Also, will the change affect the Silverleaf? I looked at 315/80/22.5 but thought the specs were not acceptable (stiffer, wider, heavier, and rim size) although I understand a number of members have changed to that tire.
BTW, the thermal wax valve controller worked very well.
Lyle Wetherholt
04 Intrigue 11740

Re: Changing tires

Reply #1
Yahoo Message Number: 78235
If you are only changing the front tires, which you said, there is no speedo/odometer adjustment necessary. No change needed in the Silverleaf either.

Don

'02 Intrigue #11427
'02 Intrigue #11427

Re: Changing tires

Reply #2
Yahoo Message Number: 78236
Am I correct to understand that you are only changing the front, steer, tires? If so, why would there be an odometer/speedometer issue?
I'll wait for the more experienced to provide greater clarification but would suspect than if going with a smaller diameter tire than original or that which was installed at the time of the realignment, that another alignment may be in order or ride height valve adjustment.

GBrown

2007 Allure 31447

Re: Changing tires

Reply #3
Yahoo Message Number: 78237
Quote
Quote from: GBrown4447@...
Thanks GBrown,

I had already considered the need for ride height adjustment but did not know where the mileage/etc. data came from. I don't understand that alignment might be an issue but yield to those with greater knowledge.
Lyle Wetherholt
04 Intrigue 11740
> Am I correct to understand that you are only changing the front, steer, > tires? If so, why would there be an odometer/speedometer issue? > > I'll wait for the more experienced to provide greater clarification but > would suspect than if going with a smaller diameter tire than original or that > which was installed at the time of the realignment, that another alignment > may be in order or ride height valve adjustment.

GBrown

2007 Allure 31447



> Due to an alignment problem that went undetected (shame on me) I am now in > the process of changing front tires. My dealer installed Michelin XZEs and > after a short trip they are unacceptable. Lots of road force. So, he agreed > to install 295/80/22.5 XZA2s. This tire is smaller in diameter by 1.3 > inches and by 17 RPMs. Thus a change will be required in the speedo/odometer.
Is this a dip switch change in the speedo or an ECM change? Also, will the > change affect the Silverleaf? I looked at 315/80/22.5 but thought the specs > were not acceptable (stiffer, wider, heavier, and rim size) although I > understand a number of members have changed to that tire.
BTW, the thermal wax valve controller worked very well.
Lyle Wetherholt
04 Intrigue 11740

Re: Changing tires

Reply #4
Yahoo Message Number: 78241
Lyle, why don't you come down to the commercial tire dealership in Sunland Park and get some 12R. They Supply Michelin tires for all the Buses that run between LA-Denver and El Paso.
TWI 2004 Intrigue 11731

Re: Changing tires

Reply #5
Yahoo Message Number: 78242
The name of the company is Redburn Tire. They are located off Sunland park Drive across from the race track.
TWI 2004 Intrigue 11731. Their prices are with in 2% of Junction City Les Schwab including NM sales tax.

Re: Changing tires

Reply #6
Yahoo Message Number: 78256
Lyle,

You will want to have the you engine ECM changed to the proper revolutions of the tires you install on the coach if they are a different diameter from what CC installed. Cummins calls these "Features and Parameters", re: tires the specific parameter is "Tire Revolutions per Distance", my 12r 22.5 Michelin XZE is 486.
I'm sure CAT has the same Parameter. It takes the Tech about 10 minutes to hookup the computer and make this change. This change will also fix the readings on the SilverLeaf. I wouldn't change the Speedo until make this ECM change then compare your SilverLeaf readings and/or GPS MPH to the Speedo.

Good idea to get your Ride Height adjusted as well.

Thanks, Mike 03 Allure 1st Ave. #30898

Re: Changing tires

Reply #7
Yahoo Message Number: 78257
Lyle, after I replied to you and re-read you post I wanted to ask if you changed "all tires" or just the Front?

thanks, Mike 03 Allure 1st Ave. #30898

Re: Changing tires

Reply #8
Yahoo Message Number: 78258
Quote
Quote from: allure012000"
Mike,

I am just changing the front tires so I don't think any ECM or speedo change is required. The ride height takes some thought. The diameter change from the original tires is 1.3 inches less. So, the ride height will change by 1/2 that. Since the axle will drop by that amount (0.65 in) I don't think the difference will be noticeable. Another issue is the shocks. It seems that the compression on the shocks will be reduced by that amount also. This could dictate a change in the ride height. Your thoughts, and others, are most welcome.
Lyle Wetherholt
04 Intrigue 11740

> Lyle, after I replied to you and re-read you post I wanted to ask if you changed "all tires" or just the Front? >

thanks, Mike 03 Allure 1st Ave. #30898 >

Quote from: Lyle"

>

> Due to an alignment problem that went undetected (shame on me) I am now in the process of changing front tires. My dealer installed Michelin XZEs and after a short trip they are unacceptable. Lots of road force. So, he agreed to install 295/80/22.5 XZA2s. This tire is smaller in diameter by 1.3 inches and by 17 RPMs. Thus a change will be required in the speedo/odometer. Is this a dip switch change in the speedo or an ECM change? Also, will the change affect the Silverleaf? I looked at 315/80/22.5 but thought the specs were not acceptable (stiffer, wider, heavier, and rim size) although I understand a number of members have changed to that tire.
> BTW, the thermal wax valve controller worked very well.
> Lyle Wetherholt
> 04 Intrigue 11740
>

Re: Changing tires

Reply #9
Yahoo Message Number: 78270
Lyle, with new front tires on how about checking your Front Ride Height? The spec is 17 3/4" between Centeline of the Shock Bolts +/- 1/16", your Rears are 12 1/2" from Bottom of Frame Rail to Bottom of Air Bag Mount Plate.
The Driver/Passenger Rear Valves can be between 12" & 13" to get the Front IFS very close to the 17 3/4"...

thanks, Mike 03 Allure 1st Ave. #30898

Re: Changing tires

Reply #10
Yahoo Message Number: 78272
Quote
Quote from: allure012000"
Thanks Mike. That is in the plan.
Lyle Wetherholt
04 Intrigue 11740
> Lyle, with new front tires on how about checking your Front Ride Height? The spec is 17 3/4" between Centeline of the Shock Bolts +/- 1/16", your Rears are 12 1/2" from Bottom of Frame Rail to Bottom of Air Bag Mount Plate.
> The Driver/Passenger Rear Valves can be between 12" & 13" to get the Front IFS very close to the 17 3/4"...

thanks, Mike 03 Allure 1st Ave. #30898 >

Quote from: Lyle"

>
>
>
>

Quote from: allure012000"
> Mike,

> I am just changing the front tires so I don't think any ECM or speedo change is required. The ride height takes some thought. The diameter change from the original tires is 1.3 inches less. So, the ride height will change by 1/2 that. Since the axle will drop by that amount (0.65 in) I don't think the difference will be noticeable. Another issue is the shocks. It seems that the compression on the shocks will be reduced by that amount also. This could dictate a change in the ride height. Your thoughts, and others, are most welcome.
> Lyle Wetherholt
> 04 Intrigue 11740
> >
> >

> > Lyle, after I replied to you and re-read you post I wanted to ask if you changed "all tires" or just the Front? > > >

> > thanks, Mike 03 Allure 1st Ave. #30898 > > >
> >

Quote from: Lyle"
> > >

> > > Due to an alignment problem that went undetected (shame on me) I am now in the process of changing front tires. My dealer installed Michelin XZEs and after a short trip they are unacceptable. Lots of road force. So, he agreed to install 295/80/22.5 XZA2s. This tire is smaller in diameter by 1.3 inches and by 17 RPMs. Thus a change will be required in the speedo/odometer. Is this a dip switch change in the speedo or an ECM change? Also, will the change affect the Silverleaf? I looked at 315/80/22.5 but thought the specs were not acceptable (stiffer, wider, heavier, and rim size) although I understand a number of members have changed to that tire.
> > > BTW, the thermal wax valve controller worked very well.
> > > Lyle Wetherholt
> > > 04 Intrigue 11740
> > >
> >
>

Re: Changing tires

Reply #11
Yahoo Message Number: 78273
Lyle, are you keeping the other 6 original tires on your Intrigue, even though they have a manufacture date of approximately 8-9 years of age? My Intrigue is 90 units newer than yours and I was thinking I needed to spend $6000 this spring on 8 new ones (even though they only have 46,000 miles.

Has the thinking changed on this issue?

Muchas Gracias,

Dick Bradley

04 Intrigue #11830

Re: Changing tires

Reply #12
Yahoo Message Number: 78283
Quote
Quote from: countrycoachbrad"
Dick,

I all assumptions there lies great danger. Your assumption that my tires are 8-9 years old is where the danger lies. I am on my second set already but ruined two front tire due to bad alignment. Thus the need for two new front tires.
BTW, spend the bucks! The economy needs people like you.
Lyle Wetherholt
04 Intrigue 11740
> Lyle, are you keeping the other 6 original tires on your Intrigue, even though they have a manufacture date of approximately 8-9 years of age? My Intrigue is 90 units newer than yours and I was thinking I needed to spend $6000 this spring on 8 new ones (even though they only have 46,000 miles.

Has the thinking changed on this issue? >

Muchas Gracias,

Dick Bradley

04 Intrigue #11830

Re: Changing tires

Reply #13
Yahoo Message Number: 78284
My unit is 11731 and I dumped my Toyo's in 2008, so my Michelin 12R's are now going to be 4 years old this fall. I will replace them in two years unless detailed inspection proves other wise. If I were you I would replace your tires yesterday if not the day before. You are really pushing the envelope for Toyos to cause you a major incident. 295's have more carrying capacity, but wear on the edges extremely fast. You really have to watch the inflation pressures to prevent premature wear. Goodyears of that size and also 315's are very susceptible to edger wear. Just ask Magna Owners from that period, especially 2005. I put XZ2 on my coach, they are a highway Bus tire. The XZE has extra wall protection, and is considered a regional tire by Michelin. Edge ware has been eliminated and tendency to wander or drift has been eliminated with the installation of the 12R on my coach. I think $6000 is a little stiff and you should be able to find a better price. Good luck.
TWI 2004 Intrigue 11731

Re: Changing tires

Reply #14
Yahoo Message Number: 78305
Dick:

This is a quote from the Goodyear website. "Statistics indicate that the average life of an RV tire is five to seven years" http://www.goodyearrvtires.com/tire-wear-replacement.aspx
I would not want to be the one responsible for an accident if my tire blew out and the tire was 8 years old.
Quote from Michelin. "While most tires will need replacement before they achieve 10 years, it is recommended that any tires in service 10 years or more from the date of manufacture, including spare tires, be replaced with new tires as a simple precaution even if such tires appear serviceable and even if they have not reached the legal wear limit." http://www.michelinrvtires.com/michelinrv/toolbox/reference-material.jsp
Gil B

'05 Inspire
51322

XZA3 11R22.5

Re: Changing tires

Reply #15
Yahoo Message Number: 78307
Thanks everyone for input on the tires. Will replace them when we head north next month.
Seems like most on the forum agree that Les Schwab in Junction City is a good bet?

Dick Bradley

04 Intrigue #11830