Off brand tires are normally lil taller than a known brand so hard to say... I know for sure a 275/45/20 atturo wouldnt fit its a 30.7s its a cheap tire few tbss guys roll around on... 275/45/20 falken for instance is 29.4 in height mounted and would fit on a truck with a 4/6... What yr truck is it? Cause the nnbs you can rock a meater tire and would ride better too...