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Old 08-21-2012, 06:29 AM   #1
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Join Date: Jan 2012
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Tire size / preformance

Old problem<> purchase 2000 coach, still had the old undersize tires @ 255/80R 22.5. Must go to larger tire and from g rated to at least h rated.
considering 275/70R 22.5 J / as h not available. Does anyone know for sure what effect this will have on my 39' 330 cat diesel pusher.
I do not want to decrease power/speed on the road or up the hills? Comments appreaciated asap....I need to purchase tires pdq.
Tks in advance.

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Old 08-21-2012, 07:36 AM   #2
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Location: Richmond Hill, GA USA
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I replaced my xrv 255x80x22.5 with Sumitomo 727 tires in the 275/70R22.5 size. All the specs fit my rims and dual spacing. Tire is slightly wider, but best part is the new tires make 549 revs/mile where the old tires made 541 revs/mile, so the speedometer error is so small that I can't detect a difference. Checked both with the GPS.

The load range H vs the G's I removed gives more load carrying ability and/or the ability to run less tire pressure for better ride. Pleased so far with the tires, ride, and handling.

My purchase was in 2009, but you might want to check Sumitomo to see if the load range H is still available. My tires still look like new.


Fred & Vicki
St. Augustine, Fl.
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Old 08-21-2012, 07:42 AM   #3
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It should increase power/speed going up hills using a few more RPM.
255/80R 22.5 diameter is 38.2 to 38.5"
275/70R 22.5 diameter is 37.6 to 38.0"
99 Discovery 34Q ISB
2014 MKS AWD EcoBoost Toad
Fulltime Since "99"
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