SFC 1000 Oscams- wheel hub dimensions

[MarnixSFC]

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?

The Marvics in Bruno’s Corsa was a set that was made to fit a 750SFC, and together with the forks it was Van Dijk’s job to mount everything. It was far from a plug and play fit! The result was fantastic though, I did a few test rides on it and absolutely loved it.

Marnix

 

[CLEMTOG]

stock teeth for a 630 is 16 front and for a 530 it is 19 rears are 36 and 40
Hamish insists that 3CE should have 38T rear and this will mean that max revs in top gear is not attainable except going down a 1:6 hill.
CLEM

 

[piranha-bro2]

That’s what I meant

Should just be a matter of grinding the same amount off the inside of the rear 530 - or adding a spacer the thickness removed the front sprocket to the inside of the rear. No need to do centreline measurements.

 

[piranha-bro2]

stock teeth for a 630 is 16 front and for a 530 it is 19 rears are 36 and 40
Hamish insists that 3CE should have 38T rear and this will mean that max revs in top gear is not attainable except going down a 1:6 hill.
CLEM

The final drive ratio on a triple is already pretty tall. Nice to drop cruising revs, but won't make the bike any faster going to a smaller rear.

 

[Vince]

Anecdotal but I found the same using a very low profile rear tyre, a 55 aspect. Loved the handling and grip but it compromised the final gearing to where I had to use way higher revs to keep the same speed as standard equipped rear tyre and geared triples. That was me at 7k when others were at 6k. That was my experience, hope I haven't defied the laws of physics with that conclusion or my next bit of congector. Typically with physics, you don't get anything for free, if I changed the final gearing to adjust for the rear tyre aspect to get equal top speed over revs I would then lose the comparable acceleration to again standard tyred and geared triples.

 

[Vince]

The final drive ratio on a triple is already pretty tall. Nice to drop cruising revs, but won't make the bike any faster going to a smaller rear.

Not faster for top speed for sure, aero and engine power have a lot to do with that but adding a smaller rear sprocket will have a huge impact on acceleration, it might affect the bike's ability to use a particular gear out of a bend that it had before the sprocket change. A classic example of that is land speed vehicles, some geared that high they won't pull away from a standing start, needing to be pushed away by another vehicle. BTW a couple of teeth on the rear or 1 on the front isn't that significant, I went one bigger on the front and 3 smaller on the rear on my last Bonnie in a vain attempt to keep up with bigger faster bikes, and that was a big fail.

 

[81Lav]

I also own an SFC 1000 with Marvic 18" wheels. #3200 from 1986.
They were on it when I purchased it about 14 years ago. Like 1200TS's bike it also came with Ohlins shocks.
The Bike was imported into Australia from the States and other than painting the wheels black and fritting a Wolfgang Stainless Exhaust system and Mikuni carb's I have not really touched it.
When it was time to replace drive sprockets, I found that Ducati sprockets were a straight fit onto the rear cush drive. The local Ducati guy's where I got the sprocket told me they thought the wheels and brakes were probably off a Ducati 888. Others have told me they are probably off a Bimota.
The first pic shows the Bike as I got it and the second one is after I had painted the wheels black and new pipes and carbs.

A few years ago I bought another SFC1000 #3174 and through the process of restoring what was a very unloved machine I restored the Ozcams but ended up putting them aside due to their excessive weight.
The third pic shows the Ozcams that are now leaning against a wall in my shed.
For this bike I have gone the Suzuki wheel route (thanks to Red) and really like the look of the Suzuki rims. See fourth pic.

What I have learnt is that changing wheels is not a plug and play exercise as you will need to look at everything in relation to every other thing, Calliper adaptors are a good example of that!
I can do some measuring for you if you need.

Cheers

 

[1200ts]

I also have one of Wolfgang's stainless exhaust systems for my SFC1000 but have never been able to make it fit. The center stand always bashes in to it. I have spend many days trying to make it work. Unless the center muffler bracket with the rubber pad in moved way down with spacers to clear the exhaust and then it will drag on turns. So I went back to the exhaust system that came on the bike.

I don't see any way to make the exhaust work unless I take off the center stand.

 

[andre]

I used to have 2piece Mavics (bolted on alloy rims) on my SFC1000. They were 18” made for a Guzzi so some modification required to fit rear Cush drive etc.
Now fitted to Motodd 1200