Dual Disc Conversion - Page 2 - Harley Davidson Forums: Harley Davidson Motorcycle Forum
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post #11 of 21 (permalink) Old 05-13-2010, 06:17 PM
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Hi I am new to this forum. I live in Australia and I was thinking to buy the new 2010 FDX, the only thing that I dont like is the single front brake. I search this forum and the net to see if someone has done the conversion to twin disc.
Does any body know of a kit or parts available to do this conversion? if so could you give me an email contact. Here in Austalia we don't have the resourses that USA has when it come to Harleys. Any advice/comments would be geatly appreciated

thanks in advance
Why bother? I have an '06 FXD35, and if I grabbed hold of my brake hard, the front wheel would lock up. Why would I need more brake than that? Or do you want it because you like the look?

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post #12 of 21 (permalink) Old 05-13-2010, 06:26 PM
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Why bother? I have an '06 FXD35, and if I grabbed hold of my brake hard, the front wheel would lock up. Why would I need more brake than that? Or do you want it because you like the look?
two are better than one...less wear also..as they share the braking chore

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post #13 of 21 (permalink) Old 05-13-2010, 06:30 PM
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two are better than one...less wear also..as they share the braking chore
Thus more expensive to replace.

There's a back brake. Used along with the front, even with a single front brake rotor, a bike should stop on a dime. Mine will. I could lock the front and back wheel up with very little effort.

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post #14 of 21 (permalink) Old 05-18-2010, 03:37 AM
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This ain't an easy conversion for the 06 and later Dynas because of teh 49mm tubes. First, if you have an alloy OEM wheel, it isn't set-up to take an additional rotor. Next are the sliders. Only Dyna sliders available for dual discs are the Fat Bob. Using these, you will run into aligment issues with the calipers. Several guys have used V-rod lowers, but some custom work is recommended for use.

Anyway you go, its gonna hurt your wallet.

Check out Index. There is some info on the V-rod lowers there.

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post #15 of 21 (permalink) Old 05-19-2010, 12:30 AM
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Dual disks wont make you slow down any faster. They just take less hand pressure to get the same level of braking and fade less as they have twice the swept area.

Braking is dependent on the contact patch and tire compound. If you can lock up a brake with a single disk then you can brake as hard as that combination will allow, no matter how many disks you have.

Racing brakes are designed more for their ability to be repeatedly used fully and not fade.

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post #16 of 21 (permalink) Old 05-19-2010, 12:38 AM
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I am thinking that this might be one of those situations that seems to be a no brainer but actually isn't. I could be totally wrong but it seems as though a dual set-up would allow better control of that place between slowing and skidding.

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post #17 of 21 (permalink) Old 05-19-2010, 01:11 AM
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I am thinking that this might be one of those situations that seems to be a no brainer but actually isn't. I could be totally wrong but it seems as though a dual set-up would allow better control of that place between slowing and skidding.
Very well could be. They just don't stop you faster as most people who want to convert to them think.

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post #18 of 21 (permalink) Old 05-19-2010, 01:34 AM
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Sounds like a good one for Myth Busters

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post #19 of 21 (permalink) Old 05-25-2010, 07:22 AM
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Everyone seems to forget that a good chunk of your braking comes from what kind of rubber you're using too. If you're locking up a lot, you probably need better tires. My Camaro will stop damn near as good as my Wide Glide because I've got race pads and good rubber on it. Although I've never directly compared them, all I know is that my Camaro will damn near plant anyone into the dash.

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post #20 of 21 (permalink) Old 05-25-2010, 07:50 AM
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Very well could be. They just don't stop you faster as most people who want to convert to them think.
Yes, they most certainly do. Braking is all about turning kinetic energy in to heat (by friction). More disks means more swept area. More swept area means more friction. More friction means kinetic energy is turned into heat faster. Converting kinetic energy into heat faster means slowing down faster. It is elementary physics.


The ability to lock the front wheel has very little to do with the abilty to slow the bike. All you need to do is overcome the coefficient of friction between the tire and ground, which is very small at initial brake grab (because the weight has not yet been shifted forward). You can do that with a drum brake. You gonna tell me you can stop as fast with a drum brake?

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