S2R 800 Single disc?

I got to ride my new S2R for the first time today (albeit through non stop traffic!) And I found the brakes pretty poor. On my last S2R I did the goldline upgrade, I was wondering if a single disc with 749/999 calipers and a radial MC would be good enough?

Just thought it might look kind of cool to see the wheel. If not I'll do the dual upgrade

[Mr Gazza]

I have noticed that some (if not all?) Scramblers use a rather large looking single disc on a lightweight carrier, with a coffin style 13mm master. Good luck finding a 13mm radial, but I'm sure they must be out there. You'd need a 13mm clutch master to match anyway.

Might be worth finding out if the Scrambler disc is interchangeable with Monster?
You might find the whole shooting match from a breaker?

[Darren69]

if you're looking at the 749/999 P34 4 pad calipers you might as well go for a pair since that is how you most likely get them. I don't think they will offer much more power wise over the standard 32/34 2 pad goldlines but I think they will offer a much better feel Its an upgrade I have in the pipeline that offers potential improvements over standard setup on my S4 but I cannot comment if that is the actually the casel I plan to pair them with some Brembo Clubman fully floating disks, similar to the cast iron ones but with stainless rotors.

My uncles cafe racer has a single disc with radial caliper and MC. Another thing is if I go single disc all the bolt holes will be visible. Can the 749/999 calipers be fitted with the standard MC?

The plan is at some point to fit 999 forks

[stopintime]

Cheaper, lighter, maybe more cool

Fast group on track days or racing down 48 hairpins from Stelvio pass often? If not, they'll do well. If you're worried about heat - go full floating. THAT'S an upgrade.

The '999' caliper advantage is that is has four pads and four 'leading edges' = more initial bite (= feels more powerful, but isn't)

I hear 'RADIAL, RADIAL, RADIAL' masters all the time.... FWIW the upgrade from 16mm coffins to a SF1098 master was the least impressive upgrade for me. I'm much more serious with my fluid changes, my bleading and my pads.

All interesting info! I'm by no means a hardocore rider and never done a trackday on a bike, however the current setup is really poor and slightly worrying (until I kind of got used to it).

So if I went the single disc route would it be as effective as a double? Do I need to change the MC or would it work with the current coffin? And how messy would the other side without the caliper/disc look?

Single disc - 999/749 caliper, 320mm disc and standard MC
Or
Single disc - 999/749 caliper, 320mm disc and brembo RCS
Or
Twin disc - 999/749 caliper, 320mm disc and standard MC

[slob]

I’d try the single disc and a radial master, either rcs or 16mm master.
The P4 calipers give excellent initial bite and you should get decent feel from the smaller master.
Scrambler uses a 330mm disc and monobloc (half a Pani’)

[Luddite]

There's no doubt that the brakes on the S2R 800 can feel a bit lacklustre compared with some of the sportier models. There are a couple of reasons for this:

First, the discs are only Ø300mm compared with the 320mm of the other models you mentioned so you're getting considerably less braking force than with the larger discs.

Second, (if I remember correctly), the standard calipers are only two-piston sliding units, rather than the four-piston opposed types of, say, the S2R 1000, so, again, there's less braking forces acting on the discs.

Some points to note if you're planning an upgrade, because of the smaller discs, the standard calipers mount on an adapter plate, whereas, with 320mm discs, the calipers bolt direct to the fork legs. See following pics...





Upgraded calipers come with either 40mm or 65mm between the mounting holes. I'm not sure either will fit on the adapter plates with the standard discs, although, if you're upgrading the calipers, it would be a false economy not to fit the larger discs at the same time.

I fitted the 65mm, four-piston, four-pad P4 34 Goldline calipers to my S2R 1000 together with Galfer discs. When I sold my bike, I took off the upgrades and sold them to a friend with an S2R 800. The 320mm discs and Goldline calipers bolted straight on and worked perfectly with the standard coffin master cylinder. Interestingly, Ducati used to offer a DP disc and caliper upgrade (320mm discs with P30/34 two-pad calipers) and that used the standard master cylinder, so I don't think you'll need to change that unless you particularly want to.

If you want to go down the single-disc route, there's information here about suitable master cylinders http://www.ukmonster.co.uk/monster/s...d.php?p=556431 Brembo recommend a 15mm RCS master for single-disc four-piston setups.

Of course, if you do upgrade the brakes, that'll probably show up how bad the unadjustable forks are and you'll then want to upgrade those too! It never ends!! ££££

[stopintime]

I wouldn't use a 'standard' master from a twin system on a single. (13mm is the closest you get)(piston area on TWO thirteens is about the same as ONE nineteen)

There are plugs and/or rings to cover the holes. Same as Ducati use on the single disc bikes (some 600750)

[Mr Gazza]

13mm master is definitely the right one to use with a single calliper.
A Scrambler one would be ideal as the early ones are in short supply and I am told that piston and seal kits are no longer available. (even if I have seen ads for them!)
Early ps13 masters are 12.7mm by the way.

The early single disc bikes did have a cover for the bare side of the wheel and also a little fairing piece for the empty calliper bracket.
But why fart about with all that... Just slap a pair of 320mm discs and Goldline callipers on and have a decent brake!!

[Nickj]

I have an old pair of goldlines, swapped out from one of my 750's. They are a bit nackered so I'll probably send them up to powerhouse for a full rebuild, blasting and and repaint in black to match the original S2R look.
Oh and Powerhouse also do full seal sets of seals for what looks like most current Brembo's.

[Mr Gazza]

Would Powerhouse be the place to get the screw sets for the calliper halves?
I believe Stainless ones are available?

Hmm decisions decisions!

Last time I went the goldline route so maybe this time I'll try the single disc route with RCS. I'm thinking the SSS rear wheel and a clear front wheel could look pretty cool. I could always switch to double if needed (Calipers will come as a pair anyway)

Anyone know where to get those covers for the wheel some of you have mentioned?

Also thanks for the bit about the adaptor luddite, as for suspension I actually find it better than the 821 I had so far. I see the bike as a long term project so I may go with 999 forks or something at some point

[Saint aka ML]

If you want to go all out go to suspension specialists and get them to change your fork bottom to radial. Then fit a 320 or 330 disc and single calliper. Heavier then what you have now but bit lighter then 2 disc 749 setup.

Do they actually do that? Nearest place to me for suspension I think is Harris Performance

(Speaking of which I had a massive speed wobble today when I hit a bump on the dual carriageway)