Absolute Authority: Arlen Ness Front 6-Piston Differential-Bore Caliper

When standard 4-piston calipers aren’t enough, the Arlen Ness 6-Piston Differential-Bore Caliper delivers the elite stopping power required for heavy baggers and high-performance builds. Engineered specifically for Harley-Davidson models utilizing 11.8″ (300mm) rotors, this caliper provides a massive increase in pad-to-rotor contact area, giving you one-finger braking confidence in any situation.

6-Piston Power with Differential Bore Precision

Increasing the number of pistons only works if the pressure is applied correctly. Arlen Ness utilizes advanced “Differential Bore” engineering to optimize every stop:

Staggered Piston Diameters: By using three different piston sizes on each side, this caliper compensates for the natural “toe-in” effect of brake pads. This ensures the entire surface of the pad contacts the rotor simultaneously, preventing uneven wear and providing a significantly smoother, more powerful bite.

Massive Clamping Force: With six pistons working in unison, you get a larger pressure footprint than any 2 or 4-piston setup. This results in dramatically shorter stopping distances, even when your bike is fully loaded for touring.

Ultra-Rigid Billet Construction: CNC-machined from a solid block of 6061-T6 billet aluminum, the caliper body is designed to resist expansion under extreme heat and pressure. This eliminates the “spongy” feel of factory cast calipers.

Iconic Design & Modern Compatibility

Sculpted 3D Styling: The caliper features the signature Arlen Ness aesthetic with deep-cut cooling fins that serve a dual purpose: they look incredible and they help dissipate heat to prevent brake fade during aggressive mountain riding.

11.8″ Rotor Optimized: This specific model is clearanced and spaced perfectly for 11.8″ (300mm) front rotors, which are standard on 2008–present Touring models and many late-model Softails.

Finish Options: Available in a mirror-like Chrome, a deep Black Anodized, or Red for a race-inspired “Big Brake” look.

Technical Specifications

Direct Bolt-On: Designed to work with the 11.8″ factory rotor size and most aftermarket 300mm rotors.

Internal Components: Features high-grade stainless steel pistons and heavy-duty seals for long-term reliability.

Hardware Included: Comes with high-friction DP brake pads, bleeder screw, and 10mm banjo bolt.

Configuration: Sold individually (Order one Left and one Right for dual-disc applications).

Experience the difference that six pistons make. The Arlen Ness Differential Bore Caliper is the final word in Harley-Davidson braking performance.

Arlen Ness Front 6 Piston Differential Bore Caliper For Harley With 11.8″ Rotors

Designed and engineerd to be extremely stiff under stress ensuring precise and consistent braking performance. Features caliper bodies that are engineered for form and function, #d sculptured design helps facilitate cooling incurred while braking.
Features:

Left and right sides available
Designed for 11.8″ disc applications
6-piston brake calipers CNC machined from billet aluminum
Differential bore
Cooling fins machined into the inner caliper halves help disperse heat
Compatible with ABS and non-ABS applications
Each caliper includes DP brake pads, bleeder screw, banjo bolt, sealing washers, mounting hardware and shim kit

Fitment Notes & Exceptions

For 11.8” Front brake rotor applications only.

This Product Fits

Harley Davidson
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Dyna Fat Bob FXDF 2008-2017
Dyna Low Rider FXDL/I 2006-2017
Dyna Street Bob FXDB/I 2006-2017
Dyna Super Glide Custom FXDC/I 2006-2014
Dyna Super Glide CVO/SE FXDSE 2007
Dyna Super Glide CVO/SE FXDSE2 2008
Dyna Super Glide FXD/I 2006, 2007, 2008, 2009, 2010
Dyna Switchback FLD 2012, 2013, 2014, 2015, 2016
Dyna Wide Glide FXDWG/I 2006-2017
Electra Glide Classic FLHTC/I 2008-2013
Electra Glide Highway King FLHFB 2023
Electra Glide Standard FLHT 2019, 2020, 2021, 2022
Electra Glide Standard FLHT/I 2008, 2009
Electra Glide Ultra Classic FLHTCU/I 2008-2019
Electra Glide Ultra Classic Low FLHTCUL 2015, 2016
Electra Glide Ultra Limited CVO/SE FLHTKSE 2014-2021
Electra Glide Ultra Limited FLHTK 2010-2024
Electra Glide Ultra Limited Low FLHTKL 2015, 2016, 2017, 2018, 2019
Freewheeler FLRT 2019-2025
Revival FLH 2021
Road Glide 3 FLTRT 2023, 2024, 2025
Road Glide Custom FLTRX 2010, 2011, 2012, 2013
Road Glide CVO/SE FLTRSE3 2009
Road Glide CVO/SE FLTRXSE 2012-2022
Road Glide FLTR/I 2008, 2009
Road Glide FLTRX 2015-2023
Road Glide Limited CVO FLTRKSE 2022, 2023
Road Glide Limited FLTRK 2020, 2021, 2022, 2023, 2024
Road Glide Special FLTRXS 2015-2023
Road Glide ST FLTRXST 2022, 2023
Road Glide Ultra CVO/SE FLTRUSE 2011, 2015, 2016
Road Glide Ultra FLTRU 2011-2019
Road King Classic FLHRC/I 2008-2013
Road King CVO/SE FLHRSE3 2007
Road King CVO/SE FLHRSE4 2008
Road King CVO/SE FLHRSE5 2013
Road King CVO/SE FLHRSE6 2014
Road King FLHR/I 2008-2022
Road King Special FLHRXS 2017-2025
Softail Blackline FXS 2011, 2012, 2013
Softail Breakout 114 FXBRS 2018, 2019, 2020
Softail Breakout 117 FXBR 2023, 2024, 2025, 2026
Softail Breakout CVO/SE FXSBSE 2013, 2014
Softail Breakout FXBR 2018, 2019
Softail Breakout FXSB 2013, 2014, 2015, 2016, 2017
Softail Convertible CVO/SE FLSTSE 2010
Softail Convertible CVO/SE FLSTSE2 2011
Softail Convertible CVO/SE FLSTSE3 2012
Softail Custom FXSTC/I 2007, 2008, 2009, 2010
Softail Deluxe CVO/SE FLSTNSE 2014, 2015
Softail Deluxe FLDE 2018, 2019, 2020
Softail Deluxe FLSTN/I 2006-2017
Softail Deuce FXSTD/I 2006, 2007
Softail Fat Bob 114 FXFBS 2018-2023
Softail Fat Bob FXFB 2018, 2019
Softail Fat Boy 114 FLFBS 2018-2024
Softail Fat Boy CVO/SE FLSTFSE2 2006
Softail Fat Boy FLFB 2018, 2019, 2025, 2026
Softail Fat Boy FLSTF/I 2006-2017
Softail Fat Boy Lo FLSTFB 2010-2016
Softail Fat Boy S FLSTFBS 2016, 2017
Softail FXDR 114 FXDRS 2019, 2020
Softail Heritage Classic 114 FLHCS 2018-2024
Softail Heritage Classic FLHC 2018-2026
Softail Heritage Classic FLSTC/I 2006-2017
Softail Heritage FLST/I 2006
Softail Low Rider FXLR 2018, 2019, 2020
Softail Low Rider S FXLRS 2020-2026
Softail Low Rider ST FXLRST 2022, 2023, 2024, 2025, 2026
Softail Night Train FXSTB/I 2006, 2007, 2008, 2009
Softail Rocker C FXCWC 2007, 2008, 2009, 2010, 2011
Softail Rocker FXCW 2008, 2009, 2010, 2011
Softail Slim FLS 2012-2017
Softail Slim FLSL 2018, 2019, 2020, 2021
Softail Slim S FLSS 2016, 2017
Softail Sport Glide FLSB 2018, 2019, 2020, 2021
Softail Standard FXST 2020, 2021, 2022, 2023, 2024
Softail Standard FXST/I 2006-2012
Softail Street Bob 114 FXBBS 2021, 2022, 2023, 2024
Softail Street Bob FXBB 2018, 2019, 2020, 2025, 2026
Sportster Custom XL1200C 2014-2019
Sportster Forty-Eight Special XL1200XS 2018, 2019
Sportster Forty-Eight XL1200X 2014-2022
Sportster Iron XL1200NS 2018, 2019, 2020, 2021
Sportster Iron XL883N 2014-2022
Sportster Low/SuperLow XL883L 2014-2019
Sportster Roadster XL1200CX 2016, 2017, 2018, 2019, 2020
Sportster Seventy-Two XL1200V 2014, 2015, 2016
Sportster SuperLow XL1200T 2014, 2015, 2016, 2017
Street Glide CVO/SE FLHXSE 2010-2022
Street Glide CVO/SE FLHXSE2 2011
Street Glide CVO/SE FLHXSE3 2012
Street Glide FLHX/I 2008-2023
Street Glide Special FLHXS 2014-2023
Street Glide ST FLHXST 2022, 2023
Street Glide Trike FLHXXX 2010, 2011
Tri Glide CVO/SE FLHTCUTGSE 2020, 2021, 2022
Tri Glide Ultra Classic FLHTCUTG 2009-2025
Ultra Classic Electra Glide CVO/SE FLHTCUSE 2006
Ultra Classic Electra Glide CVO/SE FLHTCUSE2 2007
Ultra Classic Electra Glide CVO/SE FLHTCUSE3 2008
Ultra Classic Electra Glide CVO/SE FLHTCUSE4 2009
Ultra Classic Electra Glide CVO/SE FLHTCUSE5 2010
Ultra Classic Electra Glide CVO/SE FLHTCUSE6 2011
Ultra Classic Electra Glide CVO/SE FLHTCUSE7 2012
Ultra Classic Electra Glide CVO/SE FLHTCUSE8 2013