Duramax Lifetime Supporter
Join Date: Aug 2016
Location: SW KS
IMO, if you step down to an 18", your ride will improve due to the fact of having more of a sidewall. If you keep the 20" wheel, staying at a 265/60r20 and just going to a Michelin, I don't think you'll notice much improvement. I think you'll need to step up the tire size to improve the ride, either a 275/65r20 (34.1") or 285/60r20 (33.4") in the Defender LTX M/S. I believe Ford & Dodge use those sizes because of the bigger sidewall to help improve the ride from the solid axels. GM went too small with the 265/60r20 IMO because I also didn't care for the fell of them either. When regarding just the handling feel when I switched from the 265/60r20 to the 285/60r20 (Exo Grappler) that I have now, the handling was noticeably improved where I felt it needed to be. I'm not recommending the Exo Grapplers to you because they are not a quite tire, just pointing out that the larger tire was an improvement for me. The 275/65r20 I've heard have fit w/o having to do anything to the suspension because they're only 275s. To fit 285/60r20s, you've probably have to crank your T-bars to clear w/o rubbing since they're wider which can adversely affect your ride. I'm leveled so I clear no problem and the leveling route I took didn't seem to hamper my ride quality either. If you're being financially responsible, the 265/70r18 is the least expensive tire when comparing the Michelins on the larger sidewall tires so that may be your best choice.
2016 Chevy 2500 CCSB LTZ Custom Sport Z71 - SuspensionMAXX Leveling Kit, Cognito UCA's, 285/60r20 Exo Grapplers on OEM High Country Chromes
2002 Camaro SS #8293 - M6, T-Tops, Y2Y: grille, 345 CME, Chrome ZR1s, BBPS, mats, fobs/plaque, portfolio, car cover, - Garage Queen (1,317 miles)
Sold - 2010 Chevy 1500 4x4 CCSB LT Hennessey HPE500 S/N: 21 - NHT, Blown 6.2L w/LS9 cam, CC ARH 1 7/8", Corsa, 499 RWHP 556 RWTQ @ 7lbs... was good enough for me for a DD gasser
Sold - 1998 Camaro SS #1589 - A4, T-Tops, full bolts and supsension
Last edited by BlkSS; 10-21-2016 at 04:26 PM.