Twin disc conversion for Thruxton - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 23 (permalink) Old 07-15-2011, 05:09 PM Thread Starter
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Twin disc conversion for Thruxton

Well, it's actually a Scrambler but for the purpose of this exercise, same thing. I was wondering if anyone had done the mods needed to fit twin discs to the Triumph forks, eg, weld on lugs and do whatever must be done to the hub to bolt up another disc. Before I hear any cries of "not possible", it used to be a common mod to single disc bikes years ago. Dave

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post #2 of 23 (permalink) Old 07-15-2011, 06:02 PM
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Have a look here Dave
I guess it would be possible to weld lugs on the other leg but for the amount of rooting about that would cause a front end swap would be a better option. You can put anything you like on it with varying amounts of engineering.
Check out a Norman Hyde Brembo conversion or a Beringer disc & 6 piston caliper as an option first....especially if this is all about stopping power.........both of those should be able to send you over the handlebars.

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post #3 of 23 (permalink) Old 07-15-2011, 07:06 PM
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style or function ? my 6 pot Pretech with 14 mm Nissin master cylinder and stock rotor can lift the back end up with a Michelin Pilot Road 2CT 120 mm front tire. and i'm 200 lbs with gear. do you really need more than that ? my bike does better than 222 km/h as well.

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post #4 of 23 (permalink) Old 11-26-2011, 12:45 AM
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Dave, from your resent photo's, Iam assuming you still use the Triumph 2 piston sliding with floating ebc Bonneville/Scrambler/Speedmaster/America 310mm rotor. Available for racing is the EBC 320mm iron floating disc rotor for the Thruxton.
Also available is the BrakeTech 320mm ductile iron for the Thruxton. BrakeTech also do a CMC Ceramic Matrix Composite brake rotor which can weigh as much as 1 kilogram less the a stock stainless rotor, check it out! With a six piston Beringer or Pretech caliper you would not need a twin disc setup, also consider the 3 piston nissin caliper from certain Honda motorcycles

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post #5 of 23 (permalink) Old 11-26-2011, 09:17 AM
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No, never. Why would anyone want to do that?

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post #6 of 23 (permalink) Old 11-26-2011, 09:40 AM
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+1 on what NorthernThrux said... or function?

Pretech's 6-piston caliper bolts straight on and take cheap and readily available EBC FA190 HH (sintered) pads. Dump the weedy 11mm Nissin master cylinder and replace it with a 14mm one (off, for instance, a Speed Triple - about £20 on ebay) and you'll only need more stopping power if you're Mr. Rossi.

Of course, if you do the brakes, you're really gonna need to sort out the front suspension in order to get the best out of it (even a fairly cheap fix such as a basic set of Progressive springs and some slightly heavier fork oil will go a long way).

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post #7 of 23 (permalink) Old 11-26-2011, 11:54 PM
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The others have it. Mind if you are an engineer who can pass all the mods that might be a different matter. With the talk that has been on the web re: insurance i think this would be very debatable. I have a 3 pot Nissin and cant see that you could use more than that.
If you want an aesthetic look then you might be best to look at aset of forks from another bike that will fit.
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post #8 of 23 (permalink) Old 11-27-2011, 07:43 AM
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I'll be interested to see what you come up with. I'm looking at going down the same route myself and have been doing some research on ideas for a bit now.
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post #9 of 23 (permalink) Old 11-27-2011, 11:49 AM
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I too am interested in doing a bit better in the front brake, but I don't want to go the whole route of changing the forks out for a twin disc setup, nor do I have the $700+ for a Berringer/Pretech aftermarket caliper. Apparently most of the Hondas that act as donors for 3-piston calipers are not marketted here in the US, but I did find this potential unit, courtesy of Beemerrich:

It should fit, and at < $300 delivered it may be a viable option, but I'd like a little more proof of that before I lay out the jack. It'd also be nice to know if it's black (preferred).

Anyone? Bueller? Bueller?

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post #10 of 23 (permalink) Old 11-27-2011, 01:01 PM
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I'm going to hold off on ordering one of these calipers until I can get to a Honda dealer and confirm part numbers/caliper application/color. Looking at the DN-1 caliper link you posted, it appears the caliper is either linked or anti-lock brake compatible...the NSA-700A (DN-1) has both I believe. These calipers are always gold in color in any photos I've seen.

My thought is that now that the NT-700V is available in the states, the 3 piston caliper off of one of those will work. These are non-abs bikes and the calipers appear to be a dark grey color in the few photos I've found. A link is here:

However, I don't trust this vendor to send the correct part since both the NT-700V (standard brakes) and the NT-700VA (anti-lock brakes) are listed having the same part number for the left caliper...both parts diagrams also show an extra fluid port with destination designation. Hence, the need to verify with Honda.


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