Rear brake disc alternative

discussion about the 750 Sport and '89/'90 900SS, which share many mechanicals with the Paso series
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micap
Posts: 13
Joined: Mon Mar 18, 2013 8:05 pm
model: 750 Sport
year: 1990
Location: Denmark

Rear brake disc alternative

Post by micap »

Hey there

For my absurd 17 inch conversion I decided to get some spoked wheels handmade in Italy. So far so good. Front brakes have been converted to the newer type 320 mm brembo discs, but the rear brake is still the good old one.

So my question is, what slightly newer type brake disc will fit in the mounting pattern, if any? Nevermind the size, as I intend to change the caliper setup as well.

Best regards
Michael
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paso750
paso grand pooh-bah
Posts: 5503
Joined: Sun Jul 18, 2004 12:00 am
model: 750 Paso
year: 1987
Location: southern Germany

Re: Rear brake disc alternative

Post by paso750 »

A while back I was looking for an alternative rear rotor but I couldn't find one. The inner diameter is 136mm, the mounting hole diameter is 154mm. The problems begin with most other discs only having 4 or 5 mounting holes not 6.
Have a look at the Brembo catalog (there's a link in the 907IE FAQs) or in the one from TRW https://app.box.com/s/rm3vci2pg7hlwmvjbdyk
If you find something let us know.
MatthiB
Posts: 12
Joined: Sun Dec 31, 2017 8:35 am
model: 900 SS
year: 1990
Location: Germany

Re: Rear brake disc alternative

Post by MatthiB »

After quite some search throughout the web I finally ended up with a BrakeTech disc.
I was looking for a floating rotor.

https://braketech.com/axis-rear-floaters-2/
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paso750
paso grand pooh-bah
Posts: 5503
Joined: Sun Jul 18, 2004 12:00 am
model: 750 Paso
year: 1987
Location: southern Germany

Re: Rear brake disc alternative

Post by paso750 »

From what I understood Michael has the old brake disc on his new rear rim. The brake disc bolt pattern of the 16" and 17" rims is different so the BrakeTech one won't fit.
Looks nice tho. All the rest does, too :thumbup:
MatthiB
Posts: 12
Joined: Sun Dec 31, 2017 8:35 am
model: 900 SS
year: 1990
Location: Germany

Re: Rear brake disc alternative

Post by MatthiB »

Thanks!

I'm not so familiar with the older 16" wheels.
I thought all 17" are mostly the same, except for axle diameter maybe.
micap
Posts: 13
Joined: Mon Mar 18, 2013 8:05 pm
model: 750 Sport
year: 1990
Location: Denmark

Re: Rear brake disc alternative

Post by micap »

Paso750 is right. I have had some custom 17 inch wheels made, and as it is now I am using the original rear brake disc. I was just wondering if I could find a disc that would match the newer type brembo discs. But if seems to be a bit difficult. Luckily, the rims are made with bolt-on brake disc adapters, but it will be quite expensive if I I need to have a new disc adapter machined.
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