Dunstall fork?

Can anyone give me some details on the Dunstall double discs fork?
I want to replace a Ceriani and 4LS brake by a disc(s) set up (do not have enough power in my hand to grab any drum brake anymore) and a guy I know have a Dunstall set up.
Are they 35mm
Are tubes tapered à la Norton or straight and pitched on the top?
Any chance the width could be the same than my Ceriani GP? (And I could keep my triple trees).

Thanks for the help.

bolts onto std Norton legs , of a certain width . :?

I rode a bike with this set-up decades ago and can't remember them being any better than drum brakes. They are generally not reckoned to be much good and were sometimes described as 'fork oil heaters', a larger disc and a well-matched caliper and master-cyclinder will provide better braking and also some power assistance if you are having trouble with your grip strength.

I have the early disc brakes on my 68-69 Dunstall

Worth grabbing for its historical value , if its not unredeamable .
you could likely do the panelbeating trick - tig weld stud , to pull out dent . On a set of other pads & machine to diameter to fit , and get decent friction material .
The pins likely pushed into a hole drilled in backing plate . xe of & finish with a disc grinder when done . In stages so as not to get red hot .Not that it should hurt .

Tripped over this : triple discs . PM Hurst-Airheart disc brakes, dual up front and one rear,
from : http://www.bikernet.com/pages/Bikernet_ ... ter_1.aspx
whats your $LS off of of . Raceish linings machined to drum dia. should give it a one finger operation . Any pictures , please .

OR , This is what you need . :lol:

Airheart Discs with Honda 500 calipers was a common set up , in your neck of the woods . Like THIS - built in California , when noah was a lad .

Sorry about the picture quality . I can clearly see its a bit off .

All the discs from Dunstall /1970s are out of date and are old hat.

If you have weak hands, I suggest you obtain a Norton front wheel that takes twin discs and professionally TIG alloy weld some brackets to take a couple of more modern day callipers, four pots, if at all possible, as these will give you a free servo effect. If you cannot fit these because you haven’t enough room on the inside of the disc to the spokes, use twin pots with sliders, you will still get some servo effect that is what I am doing on my Norton when I get it built.

Thanks for the answers.... So no one had/has one?

Hi Prmurat

The discs come in 3 sizes the later larger ones are obviously best. The brake hose is only fit for the bin. The pads the same. We used TZ pads & machined them to suit. The caliper is ok, feel is not the best. Forks are standard Norton so you cant use your yokes. Measure the station length/ damper rods as ours were Manx length ie very short. On there day they are better than a drum. Not better brakes but no adjustment cleaning up etc. If you are struggling because of grip to pull up a drum you will not find Dunstal discs easier. In my opinion a Japanese correct bore mastercylinder with Grimeca or Lockheed caliper & stainless hose is the way to go. Even then you will find pad choice makes a great deal of difference.

all the best Chris

I had a set on my café racer for a few years. I sold them for obscene money and built a Brembo setup that works much better. The Dunstalls were wimpy and piston seals are non-existant. I used EPDM O-rings. The pads are smaller and thinner. We made a set from stock Norton pads, but thinning the pad material can be hazardous if they are asbestos. The tubes and fork internals are stock Commando items and fit in stock Commando trees. They look cool, but unless the bike is a garage queen, you will be happier with a stock Norton brake and sleeved master cylinder. Or a Brembo setup with a 300 mm floating disc and a 4 piston caliper.