I bought some calipers from a late model touring. I have a 14 street bob want to do dual disk and make these work. The rotors are too small of course. I did searching and can't find a definite answer. I'm thinking I need about a 12.5 rotor to make them work. What is the most cost effective way? Gsxr rotor? Thanks

 

I upgraded to Brembos on my '00 Road Glide. That required that I take off my 11.5" stock rotors and go with 11.8" rotors. Got mine new on E Bay for $160 shipped.

 

Since my bike already had the 11.8 rotors that is not a option.

 

Then why do you need 12.5"? Don't all Brembos run with 11.8" on HD's?

 

I believe the reason they worked with earlier bikes is because they came stock with 11.5 rotors so going bigger to 11.8 worked. Since mine came stock with 11.8 rotors the pads on the Brembos overhang on the rotor. Complicated I know.

 

Use the search function first. There are many threads with pictures I have made explaining why. I am sorry that you did not use that function first before purchasing anything.

 

Im running brembos on my 14 LR.....bolted right up and work perfect with 11.8 rotors.12.5 will be too big.

 

Braking and Suspension on our Harleys... PITA.
Howard at Motorcycle Metal is the guru on this subject ... he introduced himself above in his usual manner.
The Fatbob's and new Lowrider's have factory dual discs so you should be able to use all of the parts off of one of them to complete your system... and I do seem to recall that the calibers you bought will bolt right up to the lowers of the Dyna's. That means you will need lines, master-cylinder, the discs, the right lower..
Dose your stock hub have the holes in it to bolt up a right disc? If not you will need a wheel.

 

For your Dyna, use the search function as everyone from the above posters except yourself & Clsd350 is wrong for your exact post of using OEM Dresser Brembo's on a FXD . I asked you to use the search function as I first find out what the problem is and than figure it out (such as this case in 2006 {when I was the first person & did it and i correctly installed dual disks} when the new FXD came out). When the persons after me asked or posted bad or dangerous install information (such as the case of using Dresser Brembos on a Dyna w/300mm rotors) and members run the risk of bodily injury I take my time (which is usually an hour or more) to explain why and and how you should or how to do the job such as in this case.

I, as in this case, informed the OP that I have or there is previous information already posted on this subject matter. In this case it was extensively covered by me. I support this forum and very rarely advertise which is expensive for those who do not take this into account (maybe 3 or 4 times in since joining this forum back in (I think 2005 before the site crash that wiped out all data but I am not that far off) the near beginning. I post only solutions to problems to help out others in subject matter I know about unlike many who have absolutely no idea what they are talking about. My volunteered time is just that, however, my time is not worthless to me. I already know the answer to the problems I post on because I do it first and know what I am talking about.

OP, either use your search function or not as it is here because my in depth explanation (several versions) was posted multiple times. I am in the process of creating several new products (over the winter) that will market including but not limited to wheel mounted fully floating 320mm race capable rotors, OEM Brembo adapters for the 2000~current FLT & FLST, and lastly for the FXD for both single & dual sided applications. I am not going to manufacture caliper adapter(s) for the FXD & 300mm rotors.

If any of the above posted information in this post was correct for the OP's application than there would be no need for me to do so. OP, the information is there and I say again If this direct language offends anyone on this and any other post I make than move on & do not read it as I have a lot to do other than waste my time. This is not a politically correct namby pamby forum but a Harley Davidson biker forum where real solutions are sought to your problems.

 

Since I have a oversized ness rotor on right now. I will wait till I prep everything else and readdress the problem then. Sorry when I Searched this I didn't come across your post. Since I have a family and a business to run. I can't stay glued in front of a computer for hours on end reading old posts. I thought maybe somebody would have a simple fix for this problem.