That subject was done to death as well. You really don't want to put anything larger on the rear since it will throw off the dynamics and stability of the bike. That said you can go up to a 180 in the rear but that is it without doing some major work. Or just get a Harley Fat Bob which already comes with a pretty Beefy tire :wink2:Not to hijack your thread, but while we are on the topic of tires.. what is the "beefiest" rear tire I dare slip onto the rear rim? Looking to ad some width, and I do realize there will be speedometer repercussions.