Hi guys, i am having a bit of a problem, i havea monty ti, which is either 05 or 06 and am trying to install a magura marta on the rear, But the 160 mm rotor i have is too big, only be a couple of mm though, anyone with any ideas, i thought 160mm was the standard for monty tis (after checking cleanbikes) but apparently its smaller.. Does anyone know what size i need? Urgently need a reply! thank you