I made the switch from ST235/80R-16's after 3 tire failures and $3800 dammage to RV. I took the advice from this forum 4 years ago and contacted TrailerTiresandWheels.com. They shipped 4 Goodyear G114's ST215/75R-17.5 mounted and ballanced on 4 machined 17.5 rims. G114's are 135 psi tires which are slightly narrower and shorter than what I had on before. You just have to tell him what size lug nuts you have as he also ships new lug nuts and hub cover. These are re-grovable tires.
17.5" Upgrade Information
If currently running a 235/80R16 or 235/85R16 tire on a 16" 8 lug wheel, you can replace them with 17.5" tires and wheels. Refer to the chart for a size reference.
...............235/80R16....235/85R16....215/75R17.5....235/75R17.5....225/70R19.5....245/70R19.5
Height....30.9"..............30.7"..............30 .5"..................31.4"..................32.1.. ................33.1"
Width......9.4"................9.5"............... .8.8"....................9.2"..................... 9"......................9.9"
*Dimensions will vary by manufacturer
8 lug hubs can have 1/2", 9/16" or 5/8" studs
Wheels for 1/2" or 9/16" studs are stud piloted, wheels for 5/8" studs are hub piloted.
19.5" wheels or for 5/8" studs only
Trailer Tires and Wheels, Inc.
103 Baylee Dr
Edon, OH 43518
(419) 272-2277
sales@trailertiresandwheels.com