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Old 03-11-2011, 06:22 PM   #1
mfp4073 OP
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/6 /7 front disk interchangeability?

Is the only difference in the disk that the one on my bike is solid and the others are drilled? Could I take a drilled one and install it with no other mods?
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Old 03-11-2011, 06:28 PM   #2
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Yes.
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Old 03-11-2011, 06:30 PM   #3
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Yes.
Thanks! Suspected, but wanted to double check.
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loner, lonegunman, get it. That’s the whole point. I like the lifestyle, the image. Look a the way I dress.
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Old 03-11-2011, 09:37 PM   #4
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I don't know if it's a /6 or /7, but I replaced my solid rotor on my '74 R90/6 with a drilled one. No mods necessary.
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Old 03-12-2011, 10:07 AM   #5
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All 74-84 front and rear brake discs are interchangeable except the R65, R80ST and R80GS which look the same but they have a deeper dish(more offset).
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Old 03-16-2011, 10:22 PM   #6
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What about the discs that have a slightly different diameter such as I have seen and are in the Hanes and Clymer manuals? 264 versus 260mm diameter. I have run into bikes that had the wrong disc diameter on them. I just looked at the ETK and apparently BMW is listing the same PN for a lot of bikes that use to have diffent diameter brakes if I remember right. What's up with that? Right now I just put some EBC 602's on a R65LS and the button washers are hitting the brake pads. The pad looks like it will hit its backing on the buttons as the pad wears. Whats up with the new PN's all being the same? Does anybody kow?
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Old 03-16-2011, 11:00 PM   #7
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What about the discs that have a slightly different diameter such as I have seen and are in the Hanes and Clymer manuals? 264 versus 260mm diameter. I have run into bikes that had the wrong disc diameter on them. I just looked at the ETK and apparently BMW is listing the same PN for a lot of bikes that use to have diffent diameter brakes if I remember right. What's up with that? Right now I just put some EBC 602's on a R65LS and the button washers are hitting the brake pads. The pad looks like it will hit its backing on the buttons as the pad wears. Whats up with the new PN's all being the same? Does anybody kow?
There was no difference in diameters from 74-84. I spent years staring at hundreds of used ones from all of the pre 84 bikes.
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Old 03-17-2011, 10:08 AM   #8
supershaft
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Not according to my memory and the Clymer and Haynes manuals.

They are hard to tell apart being just 4mm difference. I could always tell by how the brake pad rode on the disc. The wrong size disc would have the pad slightly missing the disc one way or the other depending on the mismatch.
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Old 03-17-2011, 02:35 PM   #9
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Do you have parts we can compare? That might help...
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Old 03-17-2011, 03:19 PM   #10
supershaft
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Compare what? Some are 260mm. Some are 264mm. That's the difference. They're in the old micro fische. They're in the old parts books. They're in the manuals. Why aren't they in the new ETK?
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