If you're on the stock M420 pads they're most likely resin. Some companies have awesome resin pads (Magura for example) but the Shimano ones are not that. As long as your rotors aren't stamped "resin only" then the most cost-effective upgrade you can do is new pads.
If the stock rotors are stamped "resin only" they're a huge part of the problem. Bin those ASAP.
If you're a heavy person, doing big sustained descents, riding somewhere really dry or a combo of the three then the RT86 rotors will manage heat better than the RT66 (which is also the idea behind the finned pads). For most riders the RT66 is the better buy money wise.
I really like the M420 brakes and the long - non-ServoWave - lever blade / master cylinder assembly. If they came on my bike pads/rotors are the only things I'd potentially be changing.
Sept. 28, 2020, 12:03 p.m. - Andrew Major
If you're on the stock M420 pads they're most likely resin. Some companies have awesome resin pads (Magura for example) but the Shimano ones are not that. As long as your rotors aren't stamped "resin only" then the most cost-effective upgrade you can do is new pads. If the stock rotors are stamped "resin only" they're a huge part of the problem. Bin those ASAP. If you're a heavy person, doing big sustained descents, riding somewhere really dry or a combo of the three then the RT86 rotors will manage heat better than the RT66 (which is also the idea behind the finned pads). For most riders the RT66 is the better buy money wise. I really like the M420 brakes and the long - non-ServoWave - lever blade / master cylinder assembly. If they came on my bike pads/rotors are the only things I'd potentially be changing.