Brembo caliper adapters

steph

steph

Hero member
Location
Torgny, Belgium
A project that has been dragging on for far too long .. one I’d like to move forward.

It uses an SFC-inspired Cr-Mo frame as a base.
The engine is a 744cc SF I built my way.

The goal is to build a machine intended for road use.

I would like to fit these 300mm (Moto Guzzi) brake discs to the 38mm Ceriani front fork and classic Brembo F08 calipers.
As far as I know, only Gijs Van Dijk has created such a setup for his race bikes and manufactured the necessary adapters.
I asked him to make me a pair, but that was ten years ago now :)

Can anyone here help me ?
Has anyone else on the planet made adapters like these ?
Or is there someone who could fabricate them for me ?

Thanks a lot
Stéphane

20261014_180857_7938-1920-w.jpg

20261014_182534_4111-1920-w.jpg 20261014_182534_4414-1920-w.jpg
 
Last edited:
Good luck; the Maz ones are made commercially, but not the Cer ones. The bloke who made mine, Pete Smith of Epicyles, sadly isn't with us anymore.
 
Quite a common method of fitting caliper(s) to fork legs that doesn't match the caliper mounting holes, is to make an adaptor plate out of plywood. You can get the caliper centred on the disc, and aligned on the area of the disc swept by the pads. Using plywood makes for easy shaping and can be layered, and is cheap, especially if you don't belong to the 'measure twice, cut once' school. Once you have the correct thickness, mounting position and shape, you can pass it onto a local engineering shop to machine one out of billet or alloy plate.
 
RGS1000RGS said:
Quite a common method of fitting caliper(s) to fork legs that doesn't match the caliper mounting holes, is to make an adaptor plate out of plywood. You can get the caliper centred on the disc, and aligned on the area of the disc swept by the pads. Using plywood makes for easy shaping and can be layered, and is cheap, especially if you don't belong to the 'measure twice, cut once' school. Once you have the correct thickness, mounting position and shape, you can pass it onto a local engineering shop to machine one out of billet or alloy plate.
Click to expand...
so I made mine but at first I made an adapter out of cardboard
 
Steph,

How good are you at CAD? And I do not mean Cardboard Aided Design...

A good and easy start for learning is Autodesk Fusion 360, they offer a special free version for hobbyists, students, etc. https://www.autodesk.com/products/fusion-360/personal

If you could design the part and generate a .stl, .stp or .3mf file, there are numerous online shops that could mill it for you. Usually pretty quick and quite affordable, delivered to your door. No chance of complaining if it doesn't fit though... they work to YOUR design, not theirs.

I've had excellent service from https://laserhub.com/ A prior 3D print ensures the part fits and files can be fettled if need be.

piet
 
Good luck with it, Steph. Thinking about the lugging on the Ceris and the 08s you've got quite a complex task ahead of you - especially if you consider the perceived improvement of 300mm over 280mm rotors ... on a road bike - IMHO aesthetically they won't be pretty either..

I've made two sets of adapters up using the CAD system (the Cardboard variety :cool: ), one for 08s to early VFR Honda forks and another for Nissin 4-spots onto early Gixxer forks. The former was a simple flat plate with threads, the latter a complicated profiled affair.
 
Working from memory, if you want to upgrade your calipers to the 40mm mount 4 piston Brembos used on Ducati's etc. there are adaptors that bolt everything right up. I'm pretty sure Wolfgang carried them at one point. They had offset holes for either 280 or 300 mm rotors. Four pistons are a great upgrade too.
 
Thanks to everyone for your ideas and suggestions.

My initial goal is to make use of the many leftover parts I have, such as this 38 Ceriani front fork and the Brembo 08 calipers, that have been lying around following the graduals mutations and restoration steps my SFC has undergone over the last 20 years.

I tend to agree with Quentin:
300mm is most likely "overkill."
That said, I personally do like the look of those large discs.

We’ll see ..

Our good friend Michael (v2ventiler) even suggested (via PM) that I shouldn't overcomplicate things and should just buy a Guzzi fork instead :giggle:

I simply wanted to find out if anyone other than Gijs had created an adapter of this type, and whether any CAD drawings or .stp files might be available and reusable.
 
Last edited:
sfcpiet said:
Steph,

How good are you at CAD? And I do not mean Cardboard Aided Design...

A good and easy start for learning is Autodesk Fusion 360, they offer a special free version for hobbyists, students, etc. https://www.autodesk.com/products/fusion-360/personal

If you could design the part and generate a .stl, .stp or .3mf file, there are numerous online shops that could mill it for you. Usually pretty quick and quite affordable, delivered to your door. No chance of complaining if it doesn't fit though... they work to YOUR design, not theirs.

I've had excellent service from https://laserhub.com/ A prior 3D print ensures the part fits and files can be fettled if need be.

piet
Click to expand...

Thanks Piet.
No I'm not good at CAD I'm afraid.
But that could indeed be a solution (y)

Unfortunately, accessing Julian’s workshop in Antwerp on Saturdays has become more difficult for me since I moved.
I would have liked to craft these adapters "by hand."
 
Hi Steph.
Im no use for the CAD but having made several sets of adapters for my own bike inc po8 to marzocchi twice with hacksaw and files.
It can be useful to connect up the hydraulics, even if temporary to a spare master cylinder.
Once positioned, you can lock the brake on to the disc exactly where it needs to be.


Ceriani may be different apart from the obvious hole threading but marzzochi mounting lugs aren't parallel to the fork leg.
Its just an aesthetic but i compensated second time around so that the adaptor remains parallel.

Picture attached, yes i know i need bigger bolt heads .

Cheers Rob
 

Attachments

  • Screenshot_20261017_145559_Gallery.jpg
    Screenshot_20261017_145559_Gallery.jpg
    89.7 KB · Views: 26
HansGerch said:
CAD-Fun!

Give me dimensions, please.
Click to expand...

(in mm)

X1 = 39,25
Y1 = 73
Y2 = 108

X2, X3, Y3, Y4 .. (caliper position) .. after making a cardboard/plywood template/model

.. but roughly .. unidirectional translation of 10mm + unidirectional rotation of approximately 12°

diam. H = 49,5

alpha (angle) = 65°
 
Last edited:
You must log in or register to reply here.
Back
Top