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Spare Tire

jgrimes
Explorer
Explorer
I have recently replaced all 4 tires that came on my 37ft 5er. Original tires were ST235-80-16, with max pressure of 80 psi. I purchased Sailun LT 235-80-16, with a max pressure of 110. I retained the original spare (like new, psi of 80) to continue using as a spare. In addition to higher pressure and heavier duty, the Sailun tires are 1" larger in diameter. Will I have a problem in temporarily using the "smaller and lower pressure" spare tire if I have a flat or blowout. If problematic, I would need to purchase both an additional tire and high pressure rim. Thanks for your input.
14 REPLIES 14

lee_worsdell
Explorer
Explorer
I just did the same thing and had a leaking valve stem on my new sailun. I used the old marathon 80psi to drive another 5 hrs home

momentum_rv
Explorer
Explorer
When I bought my Sailuns I bought 7 (triple axle) for a few reasons...

1 Didn't want to have to find a place to fix flat right away not knowing where a flat might occur and how far to tire shop.

2 if tire is destroyed, Sailuns are not found everywhere (yet) so didn't want to have to buy some other tire to get by and then have to get another Sailun so they are all the same again.

3 for $125 (when I bought mine) it was worth doing for just plain peace of mind. Sold all 7 "old" tires on Craigs List. win-win.

My guess is the spare will never need to hit the ground cuz the Sailuns are awesome tires! But I have another if ever needed.
2015 Grand Design Momentum 385TH
2015 Ford F-350 DRW 4x4 Lariat

lazydays
Explorer
Explorer
I did the exact same thing when I bought by Sailuns. I keeped the spare as is. Not worried at all and have really not given it any thought. If by chance I need to use the spare it would be just to get me my until I could get somewhere to fix the main tire.
Very Patient Wife
Two Boys & a Girl
2013 Keystone Avalanche 345TG
2016 Chevrolet Silverado 3500HD 6.6L

IdaD
Explorer
Explorer
I'd use them as spares and save the money.
2015 Cummins Ram 4wd CC/SB

fj12ryder
Explorer III
Explorer III
I'd keep it as a spare, just seems kind of wasteful to spend good money for a tire that is just going to sit there. It's what we did when we upgraded our tires from "E" rated ST tires to "G" rated tires. Of course the spare is a used LT tire that we bought out of necessity, just to get home.
Howard and Peggy

"Don't Panic"

ACZL
Explorer
Explorer
If all tires were same size, that's one thing. But you have 4 tires at more weight capacity, higher psi and larger in overall size. I agree w/ FTG, get a spare that is the same as the other 4. To an extent, it's no different than towing a rig w/ 2 axles and having it nose high so most of wear/tear and weight is on rear axle only. So you'll be out another couple hundred bucks. Piece of mind IMO.
2017 F350 DRW XLT, CC, 4x4, 6.7
2018 Big Country 3560 SS
"The best part of RVing and Snowmobiling is spending time with family and friends"
"Catin' in the Winter"

I think most will say to use it..

If it were me, knowing that old tire is 1" less, and less capacity would drive me crazy! Thinking that I may have a blow out nowhere near any shops and having to drive for a while to get a new replacement on a less capacity tire would drive me crazy..

I would bite the bullet and just get the same size capacity and size spare and be happy..
Me-Her-the kids
2020 Ford F350 SD 6.7
2020 Redwood 3991RD Garnet

mileshuff
Explorer
Explorer
Any issues on a tandem axle with one tire 1" smaller in diameter?
2014 Winnebago 26FWRKS 5th Wheel
2007.5 Dodge 2500 6.7L Diesel
2004 Dodge Durango Hemi 3.55 (Used to tow TT)

RinconVTR
Explorer
Explorer
I would use the spare as is and carry the tire of choice as a loose spare tire.

Upon the need to use the spare tire, just find a shop to replace the bad tire with a brand new one on your good wheel. Most any shop can squeeze in a quick job like this on their busiest of days. No need to shop around, wait for shipping, or buy a tire you don't prefer.

I unfortunately proved this concept on I80 this year (leak, not a blow out) and will forever carry one temporary fully mounted spare and one brand new loose spare of my preferred tire...on long trips out of state.

Dick_B
Explorer
Explorer
I rotate the RV tires and incorporate the spare(s) into the rotation.
Dick_B
2003 SunnyBrook 27FKS
2011 3/4 T Chevrolet Suburban
Equal-i-zer Hitch
One wife, two electric bikes (both Currie Tech Path+ models)

Lwiddis
Explorer II
Explorer II
"original spare (like new)"

No, it isn't. Was it Ozone protected. Could be serviceable however.
Winnebago 2101DS TT & 2022 Chevy Silverado 1500 LTZ Z71, WindyNation 300 watt solar-Lossigy 200 AH Lithium battery. Prefer boondocking, USFS, COE, BLM, NPS, TVA, state camps. Bicyclist. 14 yr. Army -11B40 then 11A - (MOS 1542 & 1560) IOBC & IOAC grad

Learjet
Explorer
Explorer
how old is that spare? more than 7 years I would replace it... 4 years or less for China bombs
2017 Ram Big Horn, DRW Long Box, 4x4, Cummins, Aisin, 3.73
2022 Jayco Pinnacle 32RLTS, Onan 5500, Disc Brakes, 17.5" tires
B&W Ram Companion

donn0128
Explorer II
Explorer II
Hope your wheels are rated for 110PSI?

azrving
Explorer
Explorer
I would use it. You aren't putting it on a drive axle that uses a differential.