If you have a 4x4 vehicle with a TracLock (or any type of posi-traction unit) rear differential carrier, you should never run different diameter size tires on the same axle.
It could wear out the clutches in the carrier very quickly.
Another sound reason for having a spare tire the same size as the other four tires.
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Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount98 Dodge Cummins 24 Valve