....ALL depends on what grinding disc you use as well as what pads and conditions u ride in...... muddy wet conditions wear grinds out faster then they would in the dry.. onza rims hold grinds verry verry well....use a medium compound pad ona light grind (ride say 4 days a week) will last around a month. also depends if you ride natty as you will use your brake more than you would riding street dave x