I've ran smooth rim for ages! It's a good idea. Rim last longer. Heatsink reds are good on a smooth rim, and light/medium grind. Onza pads are VERY good, But Zoo pads are even better. Just clean your rim every few week. With something..... I used to do a SUPER light grind then sand it off, and that was very good even with zoo pads. Tar is a good thing in the summer. But when you are riding in the rain/wet, don't bother. It will be off in a mater of minutes! Buy mine for a tenner + P&P??