Convert to Single Disk Harley Guide

Convert to Single Disk for Harley

This article will help you to convert to single disk your Harley disk rotor. Converting your Harley disk rotor can be a daunting task, but it is well worth it in the end. With a dual disk rotor setup, all the time and thought put into picking out the perfect wheels for your bike go to waste, with the rotors covering up most of the wheel. Once converted to a single disk, the entire wheel is out on display, and it gets even better! Using one of our Full Conversion Single Disk Rotor Kits, you can achieve this look without sacrificing any stopping power! This is achieved through replacing the stock caliper and rotor with a more powerful 6 piston caliper and 13" diameter rotor combination. Contact us today for more information! 888-926-2793

What does it take to convert to a Single Disk?

Checkout the information below on what's needed and let us know if you have any further questions!


The Caliper

You have to get a MORE powerful single caliper. Dual disk bikes are usually heavier, thus this more powerful caliper is a must! We recommend a 6 piston caliper for this which can be purchased from us in the HHI 6 Piston Caliper, JayBrake, or the PM 6 Piston Caliper, all of which have the power to stop your bike.



13" Diameter Rotor

We recommend a larger diameter 13" Rotor. When you have the larger circumference rotor, the stopping power is greatly increased and they also run cooler keeping the rotor from warping in the future from high heat. A normal 11.5" or 11.8" can be used and should work fine, but if you are really about performance and being able to stop well... The 13" is the only way to go.

Convert to Single Disk


9/16 Master Cylinder

A 9/16 bore master cylinder is needed for a single disk bike. A 11/16 bore Master cylinder is for dual disk bikes. So if your stock master cylinder is the 11/16 bore thats made for dual disks, your brake lever will feel mushy and hard to pull because the PSI is too low for the single caliper. 1984-2007 Harley dual disk bikes come stock with a 11/16 bore master cylinder which needs to be changed to a 9/16 bore for the single brake to work correctly. However, on 2008 and newer model dual disk harleys such as Street Glides, Road Glides, or Road Kings, the stock master cylinder is OK because the bore is closer to the 9/16 bore size. This is a change Harley made that turned out to be a good thing for guys converting to a single disk!

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Brake Line

A shorter brake line to be the correct length for the new caliper and eliminating the right side brake line. We offer these proprietary brake line kits when you purchase the brake caliper and rotor from us.

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Lower Leg Kits

Simply cosmetic, The Lower legs. Dual disk legs have a bracket on the right hand side for the caliper. This can look quite ugly when a single disk conversion is done and the bracket is still hanging off. So... We carry a few different lower leg kits that have the right leg bracket removed to keep everything looking nice and neat!

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Recommended Full Conversion Packages

Here are some of our wheel kits that will get you converted to Single Disk ... CALL US AT 888-926-2793 AND WE CAN SETUP A PACKAGE FOR YOU!


If you have a 2008 or newer bike, Yes. If you have a 2007 or older bike, Yes... But it is not recommended and it will likely be hard to pull the brake lever, giving it a mushy feeling. 9/16 bore master cylinder is recommended for 2007 and older bikes.

You can, but it is not recommended as 4 piston calipers do not have the stopping power needed to be safely reliable.

Yes. but the 13" rotor has much better heat dispersion and stopping power, making it the much safer, smarter choice.

Thank you! Use Coupon Code april2021 at checkout for additional discounts!