Tire Question...12R22.5
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10-12-2006, 11:39
Post: #16
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Tire Question...12R22.5
Thanks Neil for the tire info.
We use 12R tires, I do not know the rim width. I need to check out these numbers, I think I know of atleast one FC using the 315/80R22.5 , on the front. The reason, I asked is that our tire shop recommened 315/80R22.5 , Said most other buses and trucks in the area have switched from The 12R. Bill 88 FC Michigan --- In WanderlodgeForum@yahoogroups.com, "Neil & Pat" wrote: > > Hi Bill, thanks for the reply. I generally do not recommend that we > reengineer our vehicles, I would rather keep it as designed until it was no > longer possible to do so. Note, that I also use the 12R and have had no > problem getting them if I plan ahead just a tad. However, to respond to > your question please consider the following: > > The 315/80R22.5 LRH is very close match for the specs of a 12R LRH, in > addition, its available in a LRJ as well giving it a major increase in > capacity. The comparable specs are as follows: > > Spec 12R 315/80R > Wheel 9:00 9:00 > section width 11.80 12.28 > Max dia grown 43.61 43.15 > Overall width 12.74 12.91 > Tire spacing 13.5 13.82 > LRH max load 7390/6780(120psi) 7610/6940(110psi) > LRJ max load na 8270/7610 (120psi) > > These are the critical numbers; you need to ascertain if the larger tire > will fit the wheel, coach and carry the load. It looks good for everything > except for wheel spacing and this is a critical area that I do not like to > see pushed (it true that some people consider this less critical for MHs > because the are used on highways only). With the correct wheels and > adequate room on the coach the 315/80 looks like an excellent choice, which > will operate at reduced air pressure to enhance the ride; our old coaches do > not have computers so the diameter differences appear to be negligible. I > don't know how tight the FC coaches are (turning clearance is generally most > critical), you will have to check that out. I also do not know how common > the 315/80 tires are in the marketplace but at least you could use either > the LRH or LRJ at the appropriate pressure. > > Regards, > > Neil LeKander > Author "The RVer's Ultimate Survival Guide" > author@... > > > > > Hi Neil, > > Is there a higher weight rated, larger tire that is more available. > that you would recommend??? > > The 12R's are not available at many tire stores, usually ordered in > the area that I live, And finding a 12R on the side of the road > with a flat could be a problem. It would really be hard to find a > single matching tire replacement. > > Bill 88 FC Michigan > > --- In WanderlodgeForum@yahoogroups.com > > wrote: > > > > Hi John, you have already received several answers to your > inquiry; however, > > I thought that I would add a few additional thoughts. I believe > that what > > you are thinking of doing would not only be ill advised but may be > downright > > dangerous. From my years as a tire engineer and with A' Weigh We > Go > > weighing coaches including many Bluebirds (my own PT-36 included) > I have > > knowledge that most all late 90s Birds are very close to their > maximum GVWR > > or GAWR as delivered and many are over that critical (and legally > > enforceable) limit when operated. > > > > For that reason based on the lessor ability to carry a load the > 11R tires > > are in no way suitable for use on your 98 LX. The actual load > capability > > for the 12R and 11R are #6610/7390 & #6780/6005 (single/dual) > respectively, > > thus, you can see that there is a major reduction in the tires > carrying > > capacity, probably less that your coach requires. On the slim > chance that > > your specific coach might be unusually light where the 11R could > carry the > > weight it will require an increase in tire pressure to do so, > something that > > most RVers hate to do because of the ride quality reduction that > accompanies > > higher tire pressures. In addition there is a approximately > a .75" radius > > reduction (affecting your computers and dash readouts) along with > a .80" > > reduction in tread width with a corresponding reduction in tire > footprint > > area (which will increase wear, decrease steering power and > decrease > > stopping power); finally while your current rims will probably be > OK to use > > they are not optimal for the 11R (9:00 vs. 8:25) a fact which will > also > > compromise somewhat the total tire performance > > > > Do not listen to those who are not unbiased experts in just what > tires are > > required for RV usage. Remember also that RV are the only vehicle > on the > > road that "operates at 100% of its capability 100% of the tire." > Tires are > > no place to compromise; there are some very important people on > board your > > coach. Do the right thing and have your coach weighed properly, > > wheel-by-wheel as is done by the RVSEF, only then will you be able > to make > > sound judgments re: tires, pressures, etc. If you have any other > questions > > or if I have misread your original question please do not hesitate > to ask > > additional questions. > > > > Regards, > > > > Neil LeKander > > Author "The RVer's Ultimate Survival Guide" > > author@ > > > > -----Original Message----- > > From: WanderlodgeForum@yahoogroups.com > > > [mailto: WanderlodgeForum@yahoogroups.com > > > Sent: Wednesday, October 11, 2006 6:44 PM > > To: WanderlodgeForum@yahoogroups.com > > > Subject: [WanderlodgeForum] Tire Question...12R22.5 > > > > I have started looking for new tires for our coach as it has the > > origional tires on it. While they are showing no cracking at all, > I am > > still concerned about their age and would like to start swapping > them > > out before I have to do it from the side of the road. The current > > tires are 12R22.5 which seems to be a lot more uncommon than > > 11R22.5s(which I run on my dump truck). From talking to a couple > tire > > people they say the 11R22.5 are a little smaller(shorter). Has > anyone > > switched from the 12s to the 11s? Any recomendations on a > particular > > brand? > > > > Thanks, > > John Cassel > > 98 Wanderlodge LX > > > > > > > > [Non-text portions of this message have been removed] > > > > > > [Non-text portions of this message have been removed] > |
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Messages In This Thread |
Tire Question...12R22.5 - John - 10-11-2006, 13:44
Tire Question...12R22.5 - pattypape - 10-11-2006, 14:23
Tire Question...12R22.5 - John - 10-11-2006, 14:45
Tire Question...12R22.5 - krminyl@... - 10-11-2006, 15:12
Tire Question...12R22.5 - birdshill123 - 10-11-2006, 15:54
Tire Question...12R22.5 - John - 10-11-2006, 23:05
Tire Question...12R22.5 - Gregory OConnor - 10-12-2006, 01:06
Tire Question...12R22.5 - mbulriss - 10-12-2006, 03:25
Tire Question...12R22.5 - Neil & Pat - 10-12-2006, 04:05
Tire Question...12R22.5 - pattypape - 10-12-2006, 04:21
Tire Question...12R22.5 - Neil & Pat - 10-12-2006, 05:24
Tire Question...12R22.5 - Ron & Patty - 10-12-2006, 06:10
Tire Question...12R22.5 - Joe Hagan - 10-12-2006, 06:17
Tire Question...12R22.5 - smquandt - 10-12-2006, 06:43
Tire Question...12R22.5 - birdshill123 - 10-12-2006, 07:26
Tire Question...12R22.5 - pattypape - 10-12-2006 11:39
Tire Question...12R22.5 - John - 10-12-2006, 12:01
Tire Question...12R22.5 - dthollis1961 - 10-12-2006, 13:25
Tire Question...12R22.5 - birdshill123 - 10-12-2006, 15:25
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