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Old 10-19-2005, 06:41 AM   #1
Rick G OP
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R80 G/S Brake rotor advice

Hello all,

I need to replace the front brake rotor on my '85 R80 G/S and am seeking advice on which route to go. The original stock rotor is still available for around $235, Spiegler offers a semi floating conversion for about the same, but you have to send them yours first, Braking has a semi floating design for around $150.00 and I found another from DP for $200 bucks or so.

Does anyone have any experience with any of these (or another that I have not discovered yet) and can you reccommend one over the other? I would not mind gaining a little braking performance in the process.

Many thanks!

Rick G
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Old 10-19-2005, 10:30 AM   #2
MiGSel
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I have used a disk from an R100GS, the caliper from a K1100, and the original R80G/S wheel in an R100GS fork



Some info is in this thread. More on R80G/S brakes here and on airhead brakes here.

If you wish to keep the G/S fork, I'm afraid there is not very much you can do to improve brake power. If you want an original R80G/S disk in good condition, I have two left from my conversion.

Cheers,
Michel
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Old 10-19-2005, 10:46 AM   #3
Visian
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I went with the Spiegler cast iron rotor on mine.

There was no requirement to send them my existing rotor, however, as the floating buttons bolted to the carrier. Mine is an 86 model and I don't know if they changed this from 1985.

There was a requirement to use Ferodo pads.

The braking improvement was modest, but noticeable.

The cast iron rotor does rust in the rain, but it comes right off with the first application of the brakes. Looks kinda old-school!

One interesting thing... if you ride all day in the rain, your rim turns a light orange. This also washes off.

All told, I am satisfied with the conversion... and when I bought a second set of wheels for the bike I learned that the Ferodo pads are also compatible with the stock rotor.

Ian
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Visian screwed with this post 10-19-2005 at 10:52 AM
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Old 10-19-2005, 01:08 PM   #4
lkchris
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EBC makes floating rotors, too, and best price I've found for them is at parts411.com.

Best to find the EBC part number elsewhere and then search for the number.
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Old 10-19-2005, 04:57 PM   #5
no1200
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just purchased a floating goodridge rotor, looks to be excellent quality.
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Old 10-19-2005, 05:00 PM   #6
Rick G OP
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Quote:
Originally Posted by no1200
just purchased a floating goodridge rotor, looks to be excellent quality.
I haven't come across that brand. Where did you buy it and how much? Do you have a web link? Inquiring minds want to know!

Thanks,

Rick G
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Old 10-19-2005, 05:25 PM   #7
no1200
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http://www.johnstamnas.com/ In Australia but should be available world wide(made in england). Cost $360 Australian, which is expensive but 2/3 what BMW want at trade price. I looked at some other cheap solid rotors but wasn't impressed with the quality. I've also got goodridge pads and stainless brakeline. Should work well.
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Old 10-20-2005, 12:28 AM   #8
SmutMug
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MAP Engineering. Sadly no longer supplied:


http://tinyurl.com/9qrgg
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