Can I mount 225/75/16 on 16x8 rim?
Thanks much

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05 Liberty 4x4, Atlantic Blue
Extended Breathers
3/4 Mopar Skids
OME Lift, 245/75/16 General Grabbers AT2, ProComp Extreme Alloys 7189
Mopar Tow Hooks

would not be a good idea 225-75x16s call for a 6 or 7 inch rim, 8s would be stratching the sidewalls out a lot. So the answer is No

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited

You are correct tommudd,plus it will wear the outside edges faster as if under inflated and if you plan on wheeling it if you drop the psi your certian to blow a bead.A 8" rim is a good choice if running a 11.50" or wider tire up to a 13.50" tire,anything less stick with 7" rim or less.