Jim83Itasca
La Quinta Calif
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Joined: 09/16/2003
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high5 wrote:Well, there doesn't seems to be any reason not to go with the 225's. Goodyear states the diameter will only cause a 2.5% speed error. So, at 60 the speedo would indicate 61.5 mph (if my math is correct). It's interesting though that hill climbing improved significantly with a half inch change in radius.
High5, My engine pulled the hills without the down shifts with the 8R19.5 tires, The smaller 225 tires just corrected the speedo error and I do the hand math on every tank filling.....
Jim
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RV-1/2n-FUN
FL.
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Joined: 03/30/2003
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high5 wrote:RV-1/2n-FUN wrote:I went to G670-225 up front 2 years ago. Handling on the P30 was never bad like soooo many have claimed but the 225's made it even better. Left the 8R's on the rear and just put a little more air in the front bags to bring up the front. I know many have mentioned that changing the pressure in the bags with cause problems but so far not a hint of anything happening.
I am glad I went to them.
Was there a very noticeable height difference between front and rear? According to the tire specs, the loaded height should lower the axle by only half an inch. I installed custom front springs so I don't have air bags to play with.
Yes there is a noticable difference. I have the MH parked next to house and had pads level with old tires, now it sits with front down. Had 60psi in bags before and now have 80/85psi, still not level but within reason.
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high5
Michigan
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Joined: 06/09/2010
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Thanks to all. No one seems to have any significant issues with the 225's. The only negative thing I've read about 225's was on other forums. A few people felt the G670 225's had a harsher ride - nothing negative about the G647's. Goodyear claims improved stability and wear over the 8R's. I'll probably go with the G647 225's on both axles.
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bsinmich
Holland, MI
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Joined: 11/18/2000
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Wwhen I had my '96 P30 I put Kelly tires on all around using 225s in the rear and 245s in the front. Handling was great and I never had the feeling I was uneven.
2003 Newmar Mountain Aire, Workhorse W22, 2008 Saturn Vue, Falcon 5250, & US Gear Unified Tow Brake
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Brian in Michigan
S.E. Mi.
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Joined: 03/13/2003
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Hey High5, did you get the tires and where did you purchased them from?
1990 GEORGIE BOY 28' 454 4BBL, TURBO 400 TRANS, Thorley Headers B&M trans cooler. Auto meter hooked to output of trans. Flowmaster mufflers
((((Was 7.5mpg Now 8.75mpg ))))
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Jim@HiTek
Gresham, OR, USA
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Joined: 07/17/2004
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Err, I'm not positive but I thought that the 225's were WIDER then the 8R by 3/4" or 1.5" for two tires side by side. If you put them on the back, then there is a possibility that a set could rub together under conditions of high temp, low pressure and road bounce. That scrapes the rubber off the casing and can cause a blow out. I think that's happened to one poster here on the forum but can't remember the details.
On Edit: Found this link that might help - Comparison
* This post was
edited 07/29/10 05:54pm by Jim@HiTek *
 Jim@HiTek
Have shop, will travel!
Visit my travel & RV repair blog site. Subscribe for emailed updates.
Fleetwood Bounder, '94
Cummins Diesel, 190HP, 36.5'
Black Rock Lava Park, Nevada
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Sully2
Cincinnati
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Joined: 01/20/2003
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Jim@HiTek wrote:Err, I'm not positive but I thought that the 225's were WIDER then the 8R by 3/4" or 1.5" for two tires side by side. If you put them on the back, then there is a possibility that a set could rub together under conditions of high temp, low pressure and road bounce. That scrapes the rubber off the casing and can cause a blow out. I think that's happened to one poster here on the forum but can't remember the details.
On Edit: Found this link that might help - Comparison
Ive never seen a P30 with stock rims that 225's didnt fit on and work properly.
2000 Country Coach Allure; Cummins ISC 330 HP; 71/2 - 8 MPG regardless
2002 Jeep Liberty
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Gale Hawkins
Murray, KY
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Joined: 07/22/2007
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Jim@HiTek wrote:Err, I'm not positive but I thought that the 225's were WIDER then the 8R by 3/4" or 1.5" for two tires side by side. If you put them on the back, then there is a possibility that a set could rub together under conditions of high temp, low pressure and road bounce. That scrapes the rubber off the casing and can cause a blow out. I think that's happened to one poster here on the forum but can't remember the details.
On Edit: Found this link that might help - Comparison
225's is a fine replacement size. I have seen it done with 245's and nothing was touching when I looked at it but it look like a kid with his dads shoes on.  The shop owner said they had been on there for a while he knew.
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haydoracin
north central, Illinois
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Joined: 03/09/2002
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Put a set of 6 225/70 Continentals on our 1994 P30 in February before leaving for FL/TX. 3500 miles with out any problems.
Hayden & Jan
1994 Southwind 33L P-Chassis 454
2006 Chevrolet HHR
OTY (Mini Dachsund)
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overdrive75
Whitmore Lake, MI
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Joined: 08/07/2003
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I just made the swap last Saturday. Michellin XZE's 225/70R19.5's on all six. Load G's in the front and F's in the rear. After the 40 mile drive home I really liked the handling difference.
2002 Chevy 2500HD 4x4 6.0L 4L85E 4.10 Full Floater 9200GVW 16K GCVW
2002 Terry EX29J for camping
1989 Searay 230CC for the weekends when not camping.
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