Topic: CB750 Brakes on Ceriani RR Front End

[Geeto67]

Didnt one of the bikes use a CB caliper on the rear too?

Maybe, it's entirely possible. I think Cal's Iron XR had a drum front and a disc rear. None of this stuff was consistent. It was all hand made. I don't remember what the XR 909 runs but that isn't a "factory" bike anyway. By the time of the BOTTs era SOHC calipers were long abandoned.

[Ricky_Racer]

Thanks, Jag and Geeto! I haven't found time to mock up the CB750 front hub in the Cerianis yet so the info that you, Geeto, remember a CB front hub being used helps a lot. I happen to have a few sets of Morris wheels as well so I may just also play with that combination.

BTW, the GT750 front 4LS I originally was going to use with the Cerianis is actually too wide for the forks. It required milling about half of the speedo drive from the 4LS side plate to fit!

Thanks again, Guys. RR

[Geeto67]

FWIW I have a 4LS racing drum (I am having a senior moment and can't remember if it is a ceriani or a gremica) that was mounted to ceriani forks and an arces top clamp. in fact my arces top clamp and forks went on a TO XR750. I even have the fender and brake stay bracket (one piece) made by Todd Schuster (of butler and smith BMW fame). It wouldn't be cheap but it would be Pukka race bike pieces with a history (the brake was run on David Goldstein's H1 racer in AMA and AHRMA).  It's not strictly for sale but I might be persuaded depending on the project.

here is a pic of when it was assembled:


I have the axle, the fender/brake bracket, and the wheel (with tire as you see it). I'm converting to disc brakes on the bike (kz650 forks and ex500 calipers) so I don't know if I'll ever use it again.

[Ricky_Racer]

It's a Grimeca 230 4LS, Geeto. Darn, I was hoping it might be a Ceriani! Oh well, check your PM's anyway, Bud... RR

[Henkies]

Hi Ted,

maybe you remember my solution for a very narrow front hub in a Geriani fork.
I have used a Moto Guzzi hub (cheap) and made adapter plates to use CB750 brake discs.
Enough clearance now. I have used Lockheed calipers, but i think it works with any other calipers, too.

nippon

Old thread, but valuable information perhaps for mounting modern calipers and legs while retaining a narrow fork.
- Which Guzzi models's have this hub?
- Is it a split hub design? 
- Does it have the same disk bolt pattern or did you make new spacers?
- Won't it be less stable with such a narrow spoke pattern? 

Thanks!

[slikwilli420]

The Grimeca disc hub was used on Guzzi and Ducati, probably more. They are under $200 online. Just search and you should come up with some options.

[turboguzzi]

most mid to big sized 70's italian bikes (guzzi, ducati, morini, laverda)  used this hub.
In our italian championship many race with it today without problems. I think it's among the few hubs that will let you fit opposed piston calipers and still have clearance to the spokes. no magic here, if you want to use a wider hub you will have to offset the discs outwards and maybe find wider spaced triple clamps... not sure whats the lesser evil

motocicliveloci seems to stock  the parts

http://www.motocicliveloci.it/inglese/catalogue/ruoteparts_uk.htm