OK well tar you can put on your rim and it helps but a grind will be longer lasting. If you do a harsh grind or medium Koxx Bloxx Browns pads are what id recommend but on a light grind maybe Koxx Bloxx reds. If your brake doesn't slip and is OK for your level then you can leave it but if you start doing bigger stuff and don't feel confident with your brake i recommend upgrading pads and if still put a light grind on. Ash~