What does the imperial size, ie 6", 7" etc refer to in the sizing of these brakes? I have postmount front and rear brakes with 160mm rotors on my bike but when measuring to see what size Magura's I might need I can't see what the 6" etc equates to at all! At first I thought it was the rotor size in imperial, but then saw you can get 6" and 7" versions with 160mm rotors so that's that theory out of the window. So how do I know which ones I need to buy? Can you explain please?
Marta SL Magnesium Disc Brake with Storm SL Rotor