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12-16-2015, 12:18 PM
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#1
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Member
Join Date: Mar 2015
Location: Golden, CO
Posts: 90
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Spare tire size
Hello all,
My 2 axle TT came with 205 75 14 tires and wheels. This spring I'm most likely going to put on 205 75R 15 tires and wheels. The difference in tire ht is 1 inch. So that means only a 1/2 inch difference on each side of a diameter measurement. What are your opinions about keeping the 14 in spare tire and wheel?
Thanks,
Dale
__________________
Dale and Deb
2016 Jay Flight 27BHS TT
2009 Silverado 2500 6.6L Duramax
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12-16-2015, 01:06 PM
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#2
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,982
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Rethink this; use this tire size comparator to see exact differences in these sizes. It shows 3.14" difference in diameter. What you see as a 1" difference is rim size NOT tire diameter. So when you install the 15" tires, tread will be 3.14" closer together too.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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12-17-2015, 09:31 AM
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#3
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Member
Join Date: Mar 2015
Location: Golden, CO
Posts: 90
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Quote:
Originally Posted by Ray,IN
Rethink this; use this tire size comparator to see exact differences in these sizes. It shows 3.14" difference in diameter. What you see as a 1" difference is rim size NOT tire diameter. So when you install the 15" tires, tread will be 3.14" closer together too. |
Thanks, that's a cool chart. I bookmarked it into my tire section. The chart reads the 3.14 as a circumference difference. The diameter, tire height, difference is 1 inch. Easy to mix up. Thanks,
Dale
__________________
Dale and Deb
2016 Jay Flight 27BHS TT
2009 Silverado 2500 6.6L Duramax
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12-17-2015, 08:59 PM
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#4
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,982
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My bad, I misread the data, sorry.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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12-17-2015, 09:09 PM
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#5
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Senior Member
Tiffin Owners Club
Join Date: Mar 2015
Location: Southern NM
Posts: 2,514
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Ray, Thanks for the link to the chart, pretty neat
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2005 Tiffin Allegro Bay 37DB
W22 Workhorse Chassis 8.1 Flat Towing a 82 Jeep CJ7
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12-18-2015, 12:12 PM
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#6
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Senior Member
Join Date: Feb 2009
Location: Ca
Posts: 1,076
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More tire options in 16" if you are going to change.
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12-18-2015, 01:43 PM
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#7
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"Formerly Diplomat Don"
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 24,125
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I would leave the spare tire as is, unless you come up with a spare rim and tire for free. Having a size difference is really only an issue on an axle that's powered, like the rear end of your truck. You don't want to mix sizes on drive axles. Using the smaller spare on a trailer axle, for emergency use, is not a big deal.
__________________
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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