Moving brake calipers behind fork leg

Opposite to this one.

Laverda_Jota_brochure_CH.jpg
 
I don't think disk spiral hole pattern has anything to do with water dispersion. If one way is preferred, then I imagine it has more to do with the way stresses are distributed within the disk.

During braking, the caliper exerts a generally tangential load on the disk. With the spiral hole pattern the "wrong" way (the way cape has them), the forces are going across the spiral rows of holes, so there may be more of a tendency to to pull the disk apart along the perforation lines like a postage stamp. With the disk the "correct" way (the orientation that Simon suggests), the stresss are more aligned along the the spiral arms rather than across them.

I have two other Italian bikes (Ducati and Benelli) with the same disks. Both bikes are as they came from the factory, and both have the disks the right way according to the above theory.

Not that I've ever seen a broken disk that could be attributed to it rotating backwards ...

Cheers,
Cam
 
If you look carefully at the hubs and discs, you will find a '1' and a '2' stamped on them, indicating which disc should go on which side (well they do on my RGS). hope that helps.

Terry
 
Interesting thread..

I too don't think the holes are there for water dispersal, rather, they are there for heat dispersal. The overall surface area of the disc is increased though the area of the cylindrical sides of the holes being greater than the area of the fricion surface being removed. I suppose the idea is to sacrifice some low temp/speed braking potential in order to prevent brake fade at higher speeds/temps..

Not sure I like the idea of drilled discs personally, especially after having seen pictures of Cosi's rear disc falling apart a while back.. It seems my Mirage has recently been fitted with them :o :o Can anyone tell me if the diameter of the drilled stainless discs is different to the original cast units and can they be used with the same calipers ok (Keith?)

The 1 and 2 marks... any clue as to which side's which?

AndyW
 
I checked the discs again and a funny thing I noticed. Disc on the left is the ?wrong? way and the disc on the right is the ?right? way. So I would have to reverse the left one, but it's not possible. The outer side of the disc is slightly different than the inner side. There is a small threshold beside the bolt holes. I'll have to leave them as they are. Btw the drilled discs on my bike are cast, not stainless. They rust beautifully as they are supposed to.  :D
 
Reckon drilling holes in the disc helps lose some weight.  And boy, do those discs need lightening!
 
Braking is best when you throw away the original calipers and fit 4 pots with carbon/organic pads. :D
 
Look at the hubs, should see  the 1 or 2 adjacent the disc.

Terry
 
Cape, many years have passed since the bike was new.
Are you the first owner?
If not then who knows what a previous owner has done.
If you do not know it's history from new then there is no way to know if it left the factory like that.

My guess is that a disc was changed at some point and they put the wrong-side disc on.

I would not reverse the disc in question. They have 2 different sides, maybe for a reason, but it would look crap if you reversed it.
Have a look at your rear disc. Maybe you could swap it with the front one of the holes were in the correct orientation.

Or just leave the disc as it is and ride the bike. The braking won't be affected.               
 
No, I'm not the first owner. I've had the bike since 2008. I managed to find out very detailed history of the bike couple of years ago with the help from webmaster of Laverda Gemeinschaft Deutschland. In short: The bike was originally registered in Germany and had two owners. Then it was sold to a motorcycle dealer who converted it to spoke wheels, painted it etc. So the discs may have been changed at the same time.

The rear disc is the same as the left one in front. No help there. I'm not planning on doing anything to discs, just leave them as they are?
 
When i fitted my 4 pot calipers to my series 2 Jota i reversed the fork legs but had to make up a small spacer to go in one side so that the wheel lined up correctly and had to get a longer speedo cable, Corsa i think, to fit.

I made up my own caliper mounting plates and had them anodised at a local platers to match the calipers and the whole job looks really good.
 
Why bother making your own when Guzzitech make nice simple ones for the standard wheels and discs (may also fit Gixxer wheels and discs if turned upside down) or for the latter setup you could have the things of beauty that Red makes.
 
Can someone please tell me how turning the forks around so the calipers are now acting on the back of the forks rather than on the front can change the handling of the bike? The braking forces on the forks are in the same direction, so is anyone able to give a technical explanation to this alleged phenomenon?
 
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