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faceman 11-02-2009, 06:58 AM Shopping online for rear rotors. How do I know if mine are 86 or 91 MM tall? I am assuming that the 91MM are for dual wheels??? My truck is a ext cab 2500 hd durmax. Anyone know whats on my truck so I don't orderthe wrong ones. Thanks ktackaberry 11-02-2009, 09:40 AM The easiest way to find out is by pulling one of the rear center caps and measure the axle hub. If it is a 4.63" rotor size the hub will be 4.5". This is for the size of the center hole in the rotor. It will be larger if it is the 4.83" size! I just finished mine last week. Charlie B 11-02-2009, 11:29 AM I guess [depending on where you purchase the rotors] they ask for different dimensions. When I purchase them , they ask for the center hole size and other vendors ask form the hat size. I'm assuming the 86mm hat size goes with the 4.63 hole sized rotor and the 91mm hat size goes with the 4.84 hole size rotor. It is easier to measure the hole size by just taking off the center cap and measuring where the hole in the rotor fits the bearing hub. To measure the hat size you have to take off the wheel. just my thoughts---Charlie PS. My 04 HD has the 4.84 hole size rotor. dr_unspoken 11-03-2009, 04:28 AM 91mm just did the brakes last weak. dmaxalliTech 11-03-2009, 06:59 AM All the HD Diesel trucks will have the larger of the two. max 02 11-03-2009, 10:15 AM All the HD Diesel trucks will have the larger of the two. That is what i was told when i replaced mine. confrontational 11-03-2009, 10:41 AM From my experience there is no benefit shopping online for rotors. You can buy new ones from any local autoparts store for under $40 each. They are so heavy shipping kills and decent deals and the "fancy" ones don't do crap. Carl Lassiter 11-03-2009, 11:24 AM Shopping online for rear rotors. How do I know if mine are 86 or 91 MM tall? I am assuming that the 91MM are for dual wheels??? My truck is a ext cab 2500 hd durmax. Anyone know whats on my truck so I don't orderthe wrong ones. Thanks 91mm for the 2500 and 3500 dually deeds 11-03-2009, 01:58 PM I would guess 86mm for the 10.5" 14b(6.0) and 91mm for the 11.5" 14b(8.1 & 6.6) | ||