Hi fellow hubbers, Ok so I recently changed my front rotor to 180mm from 160mm standard rotor using a Shimamo post mount adaptor 160/180 and 180mm rotor by Definitive Bikes (new parts from LBS). Bearing in mind that the 160mm setup worked 110% fine, no air in the system, pads are still good, etc. using BR-M615 Deore brakeset on Titan 27.5 hardtail with Mavic front wheel 15mm bolt thru. Centered the caliper and all seemed good until bedding in the brakes. As you pull the brake lever the brakes will either be solid and work correctly or, depending on where the the pads bite as the rotor rotates, the there will be what I can only called a feeling of the rotor slipping, biting, slipping, biting until it locks up or one stops. (at a higher speed this feels like pulsing or vibration) This is what I've checked so far... Pad spacing/advancement Realigned caliper Checked rotor bolts Cleaned pads and rotor (rotor cleaned with brake cleaner and pads sanded/cleaned using +- 1000grit paper) Swapped rear / front pads (problem persists in front - rear stays smooth and solid) Re-checked pad spacing in relation to rotor 160mm rotor had around half mm of side movement as wheel turned but never slipped, 180mm rotor seems to have same side movement as the wheel turns but just does not bite at certain points in the rotation. Definitive Bikes brand is a lower cost alternative to the higher end products and I have subsequent bought a SM-RT56 Deore rotor which I don't want to install before getting some thoughts/advice.
