SFC 1000 Oscams- wheel hub dimensions

RGSFC

RGSFC

New member
Location
Piemonte
In the proces of ordering a set of Marvic wheels, to replace the the Oscams it was born with. Trouble is that they don’t have any dimension data for the hubs for that bike. Does anyone have that?
They sent me what they have for the SFC 750- shown below. That’s the sort of data they need.

Best regardsIMG_0431.jpegIMG_0430.jpeg
 
Actually I sent them a picture a picture of your beatefull bike and others, with Marvic Streamline wheels to prove that some SFC 1000 had Marvic wheels. They commented that the rear wheels were mounted the wrong way around because of the chain on mounted on the right hand side. The streamlines are still made today, but as you hint, only i 17” versions. It’s the best looking wheel ever made, but I am going for a 18” replica of the original Campagnolo wheel that came out in 1973 and revolutionized Grand Prix racing. Trouble is, that they lost the data they had for our bikes,
 
I don't believe any SFC1000 had Marvic wheels from the factory. My bike when new was a 1988 SFC1000 classic with wire wheels which I still have. The first owner also did the brake upgrade and the Ohlin shocks and painted it orange. I also was received another set of body work in green which I fitted and it looks better green.

Doing a little research, the 1988 Bimota YB4 (street version) had 17" Oscam wheels and the YB4R (race version) had 17" Marvic wheels. So I don't know what the 18" wheels on my bike came from? Ducati maybe? The only 18" wheels Marvic still makes are the five and seven spoke version. The three spoke version is only 17".

My SFC1000 was sold new in Germany where all the changes were done and it now lives in California.

It is a great bike to ride other than the rear brake which could not stop a bicycle.
 
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The YB5s originally had a directional five spoke 18" Technomagnesio, with a slightly angled spoke somewhat similar to a Marvic Penta. Shod with really low profile tyres they looked really nice. I think a few late ones had two-piece (separate rim) bolted three spoke, not sure which brand, but still 18".

Bimota were first on the bandwagon of 16" rims, lots of their 80's bikes were so equipped, either their own pressed and rivetted (a bit like an astralite) or Campagnolo 5-spokes. They briefly went back to 18" on the YB5 in 87 but then the YB4 in 1988 was 17" in sizes pretty much the same as we have now. Many of the 16" bikes got converted later in life so as to access decent tyres. So no idea what model was being referred to other than it would not have been a YB4.

Of interest to @RGSFC is the little gem of information via @ozijotati that SFC1000 wheels have a smaller dimension between the front disk attachment faces than all other twin disk Laverdas. So don't use the dimension 88mm as per the above drawing, check an actual SFC1000 to confirm the size, probably 86mm or so. This was narrowed to allow clearance for the protruding bobbins of the floating disks when combined with the larger M1R forks. Be careful!

Those wheels are beautiful and will look great @RGSFC. Marvic have made them before to suit, a Belgian fellow was at Breganze 2019 on a very nicely modified RGS Corsa including M1R forks and those Marvic 5-spoke wheels. I think it was Bruno Chevolet (?). @MarnixSFC will know him for sure. If you can get in touch with him, he should be able to provide detail of the job and Marvic can pull the details from that?
 
Here’s a few of that Corsa, bit cleaner than Steve’s photos😂. I think that the forks are bmw 41mm showa’s. Cartridges are fitted as well👍😊
 

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RGSFC said:
In the proces of ordering a set of Marvic wheels, to replace the the Oscams it was born with. Trouble is that they don’t have any dimension data for the hubs for that bike. Does anyone have that?
They sent me what they have for the SFC 750- shown below. That’s the sort of data they need.

Best regards
Click to expand...

I have a set of Oscam wheels on the shelve as I replaced them with the GSX-R 1100 wheels (which looks amazing to me and is one of the best conversions I have done to improve handling, thanks to Piet's hint and with his help).

I can not remove the bearings though but could try to measure other dimensions. I am not a trained guy on these kind of things, so if someone in a 50km distance from Bergisch Gladbach would be willing to do the measuring, I would be willing to bring the wheels around with some cookies to share... 😉
 
"It is a great bike to ride other than the rear brake which could not stop a bicycle."

you have my sympathy and my utter 100% agreement.
CLEM
 
Thank you so much breganzane, ozijotati and Paul for that goldmine of information- this can bring me closer to the goal👍
And thanks for your fantastic generous offer Lothar😊. I still have to figure out, who is able to measure the wheels properly, but that must be possible. Also i need to make corrections on the chain “centerline”. I bought a modified front sprocket from OCT. It is a standard 630 sprocket,
thats grinded down on the inside, so it is now a 520 sprocket, moved outwards. The same correction, of course needs to be made to the rear
wheel.
It’s great with all the combined knowledge on this forum.
 
RGSFC said:
I bought a modified front sprocket from OCT. It is a standard 630 sprocket,
thats grinded down on the inside, so it is now a 520 sprocket, moved outwards. The same correction, of course needs to be made to the rear
wheel.
Click to expand...
It may have been a misprint, but no amount of grinding will turn a 630 sprocket into a 520 sprocket.
The number of teeth would be different. Did you mean a 530 sprocket?
 
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