Ive got a dt 350 centrelock hub and I need a lock ring to hold the rotor on, which one do I need? I bought two off ebay for front and rear, but one doesnt fit, is it the type which you use a bb spanner on? Superstar do one, has anyone got a dt hub? What has it got on?

Front or rear hub? 15mm axles use a larger hole in the middle, so a BB type spanner is necessary. 9mm qr sometimes use a freewheel removal tool.