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Great rotor, somewhat fragile
In my experience the RT86 rotors are much less likely to squeal than aftermarket rotors. Dealing with squeal is enough of a hassle that they're worth it for this reason alone.
The new IceTech composite construction is alleged by Shimano to be better at dissipating heat. I haven't noticed any difference in my riding, but what I have noticed is that the steel-aluminum-steel composite is more fragile and easily warped than the prior all-steel construction.
1 review for Shimano Deore XT SM-RT86 IS 2000 6-bolt rotor with an rating of 4 points.