New disc brake slider

Next year I will be producing pinchbolt fork sliders , the early round ones,
If I was to make a disc brake slider then I could make the new slider so it could accomodate a larger disc, 300mm?
I would need to determine which caliper , Brembo from a Ducati maybe or??? and which discs could be used.
My idea would be to supply a slider to which you could directly fit your own caliper and disc, not a Noton Production Racer or Norvil type setup. probably a 4 or even a 6 piston caliper.
constructive criticism only please.

I like the idea.

I'll bet if you look at a dozen current 600cc UJMs, you'll see that they're all the same if not the same spec, where the brakes are concerned.

Shoot for something common, with relatively low pricetag and ready availability.

There's a few issues here. One is picking a rotor dia that has cost effective choices available. 310/320 mm rotors are by far the most common for road bikes. Another is as OD increases so does the speed/friction/heat differences between inner and outer rotor section. This is why they use small mulitple piston calipers on narrow rotors now instead of one big ole pad like Lockheed's, or else get wrapped rotor issue. So if you pick the most common rotor size then you shoot self in break pad foot of Norton's art deco sculptured caliper I like so much too.

The adapter plates look rather inelegant stop gap mounts with extra parts and mass to me. I fitted rare 290 mm wave rotor to Ms Peel w/o adapter gizmo but does leave ~1/4" of Lockheed pad over hanging the rotor rim. I figure the extra OD leverage and rotors friction increasing edges and lighter spinning mass to slow will more than make up the slight lost of total swept area. Not sure what to do the the excess pad edge, just leave it alone for bit more heat radiation area and let rest of pad wear a lip or grind off to match rotor arc. Trick was to not foul the floating fasteners. I assembled everything with brake lever squeezed then welded the piece in there so assured aligned and clearance once cooled.

Ludwig what is the rotor thickness you are using? I notice you are using a 32 spoke wheel, what is the reason behibd this?
Hobot what is your rotor thickness ?
most of these big rotors only have a 5mm thickness

How about a slider that allows a 2nd disc on a Commando, std caliper.
Twin discs would give some stopping power - and the std master cylinder would then make some sense ? Hub and axle might be interesting, and wheel lacing .

RGM sells a dual disk hub reasonably priced. I am about to order one this week. I have one disk now, but a future project is to add the second, and a slider with the mount would be great.

It would be nice if you made a slider that would take a four piston Brembo on a 310mm disc. The calipers and discs are on ebay all the time at bargain prices and they would meet the needs of just about anybody.

how about a 6 piston Tokico on a 310 or 320 disc? this is what I'm looking at,

This is a fairly conservative crowd.

Hobot what is your rotor thickness ?

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Its a race only 290 mm - 11.6" BraKing wave rotor, 1/4" or 5 mm thick, model STX400 4mm minimum thickness, floating button mounts. Found on ebay cheap as full retail is couple $100+ at least.

I practice braking as most important scary and hardest skill to learn. I'm no stunter yet but have stoppied a SV650 and Ninja but they do not stop as short and secure as my single brake Commando's. Ease of lever is one thing but the real issue is tire grip and controlling that w/o lifting the rear much or means head over tea kettle unless backing off braking effort. With this experience in mind I figured less spinning and un sprung mass was better way to slow and stop my Cdo's. I actually expect to beat elite sports bikes with ABS in 100 > 0 time and distance. They may have a balloon tire which looks the business but hehe they still have similar tire patch area so only tire compound and air pressure matters in front braking grip. Its dangerous to panic grab brake near 100 on the moderns w/o ABS but not my Cdo's which just squeal loudly w/o ABS jerks till under 60 then must back off or lock up. You can't really stop where intended on THE Gravel with ABS. Dual discs have more heat tolerance before fade by sharing heat loads so may work better for tight tract racing conditions.

Window shop here
http://www.kneedraggers.com/list/1226/bike/Suzuki/SV650

Could you get twin discs on a Commando by running twin disc sliders, one std caliper behind the forks and one in front of the forks. ?

Assuming the hub would take twin std discs, how would you work the axle ?
Is there room to work twin discs in there ?

the Norton hub doesnt really lend itself to the idea of twin discs, in the past I remember seeing a fore and aft twin disc setup , not sure if it was on a Norton or Triumph, not my cup of tea and I certainly wouldnt be going that way.
For twin discs you would need a different hub, Its not my plan to go twin discs, my plan would be to have a single disc kit available consisting of slider, rotor, and probably caliper, which would all bolt to or replace exixting items with out modifying anything, people want bolt on parts straight out of the box that fits, no messin about. Master cylinder of their own choice.

are you saying its easier to make a new hub to fit the disc?
making hubs, drilling rims to suit specific hubs and making spokes to suit is no big deal for me.
my intention is to make an easy fit, brake upgrade for standard Norton wheels. where the owner doesnt have to worry about changing or modifying his standard wheel, apart from changing the fork slider he would only need to unbolt his heavy cast iron disc and bolt the new 320mm disc on , using the existing 5/16" UNF studs and nuts, ( a simple disc change)

I agree the standard wheel is not the best design , Norton realized this thats why they used big diameter spokes,
There are thousands of Nortons running around and racing them to, with the standard wheel, they been doing it for 40 years

Here is a brake I make for pre Commando, although I've sold some to guys who fitted them to early Commando's
260mm 4LS TZ replica specifically for Norton fitment

thats the main objective Ludwig "the slider" to get away from an unsightly adaptor plate or an obviously modified slider.
just trying to make the setup look a bit professional thats all.

I believe Norman White already provides a kit with a left hand slider, altered to fit a disc brake caliper, albeit with an adapter so both left and right sliders are symetrical and can use Brembo calipers, He also provides a symetrical 40 spoke hub and disc rotors as well.

http://www.normanwhite.co.uk/prod01.htm


JD

madass140 said:

Next year I will be producing pinchbolt fork sliders , the early round ones,
If I was to make a disc brake slider then I could make the new slider so it could accomodate a larger disc, 300mm?

Click to expand...

Hi
If you decide to make an opposite side disc brake slider at a resonable price and of good quality, please count me as taker. For the largest number of takers, I suggest you make it as a mirror image of the std. dirc brake slider (pinch bolt end aside).
Not sure what you mean by "early round ones", is something wrong with the elliptical Commando design?

Rgds.

Knut Sonsteby

I have no plans to make a slider to accommodate twin discs.
as for a replacement pinchbolt slider, there are many R.H drum brake sliders out there with no partners , probably more so than for the later Commando type, not saying there isnt a need for Commando pinchbolt sliders.
I should have the prototype 6 piston caliper slider set up ready to show in a couple of weeks.
The standard mastercylinder with a 1/2" piston will give it a 28-1 ratio. spot on. as you may have seen in another post I'm working on that M/C kit as well.

six pot pretech 300mm disc std slider