R80 G/S Brake rotor advice

Rick G · 10-19-2005, 06:41 AM

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

MiGSel · 10-19-2005, 10:30 AM

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

Visian · 10-19-2005, 10:46 AM

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

lkchris · 10-19-2005, 01:08 PM

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.

no1200 · 10-19-2005, 04:57 PM

just purchased a floating goodridge rotor, looks to be excellent quality.

Rick G · 10-19-2005, 05:00 PM

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

no1200 · 10-19-2005, 05:25 PM

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.

SmutMug · 10-20-2005, 12:28 AM

MAP Engineering. Sadly no longer supplied:

http://tinyurl.com/9qrgg

10-19-2005, 06:41 AM	#1
Rick G ^OP Ranger Rick Joined: May 2004 Location: Euclid, OH Oddometer: 1,641	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 __________________ Any Road Any Time! 2009 Triumph Bonneville T100 - Neo Classic Retro Tourer. 2009 Vespa GTS Super 250ie - Just for Kicks & Giggles

10-19-2005, 10:30 AM	#2
MiGSel GaStronaut Joined: Jan 2003 Location: Belgium Oddometer: 389	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 __________________ On a steel horse I ride... Accessories are at www.migsel.com

10-19-2005, 10:46 AM	#3
Visian Look out! Joined: Aug 2001 Location: ATL/WNC Oddometer: 1,519	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 __________________ Go soothingly through the grease mud, as there lurks the skid demon. ________________________________________________ '86 R80 G/SPD+ \|\| '00 1150 GS \|\| '06 HP2e \|\| '67 Trail 90 Visian screwed with this post 10-19-2005 at 10:52 AM

10-19-2005, 01:08 PM	#4
lkchris Albuquerque Joined: Feb 2005 Oddometer: 845	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. __________________ Kent Christensen Albuquerque '12 R1200RT, '02 R1100S, '84 R80G/S

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10-19-2005, 04:57 PM	#5
no1200 r80gs project Joined: Aug 2005 Oddometer: 23	just purchased a floating goodridge rotor, looks to be excellent quality.

10-19-2005, 05:25 PM	#7
no1200 r80gs project Joined: Aug 2005 Oddometer: 23	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.

10-20-2005, 12:28 AM	#8
SmutMug Banned Joined: May 2004 Oddometer: 40	MAP Engineering. Sadly no longer supplied: http://tinyurl.com/9qrgg