I am new to the Harley family having bought a 2020 Slim FSLS a couple months ago... Love it!

I have made a few minor cosmetic mods but one that I would like to investigate is putting a slightly larger back tire in place of the stock slim tire.

1. what is the largest you can get away with on the stock rims without rub issues?
2. what is a good upgrade tire brand from stock tires?

Thanks!!!!