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The winner can choose from an Apex clutch kit or RadiusCx kit.

Raffle will be drawn October 4th, 2025.

 

APEX: The Ultimate Harley Clutch Every Big Twin Should Have

A new, innovative clutch system is available now that will give Harley riders a new perspective on clutch capabilities. How, you might ask? Well, to answer that question, we must first answer “Why?”

Why Design a New Harley Clutch System?

Upgrading a Harley clutch system is not a new concept, but determining what type of clutch upgrade is best for the type of riding you do and the feeling you like can be tough with the various types of clutch systems on the market. It’s important to understand what riders’ goals are with their Harley clutch, and among the many out there, we know clutch lever pull effort and lever feel are at the top of the list. Each style of clutch on the market, from extra plates to a slipper clutch to a lock-up clutch and everything in between, has its advantages but undoubtedly comes with its downfalls, too.

We aimed to solve the major Harley clutch concerns when designing and developing the new APEX clutch system for Harley-Davidson Big Twin engines, starting with lever pull effort. Thanks to its proprietary design and patented components, APEX reduces clutch lever pull effort and improves modulation regardless of if your bike is bone stock or built for all-out performance. More on how we accomplished this later in the article.

We looked at clutch versatility in addition to lever pull effort as well. With baggers and other Harley models continuing to increase in popularity and being used in more riding and racing styles than ever before, the compatibility of existing aftermarket and performance clutch options continues to become more segregated, leaving riders unsure of what’s best for them. This all led to the highly versatile APEX clutch: an all-performance capable manual clutch system that will help riders get the most out of their Harley, regardless of their riding style or other performance upgrades.

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How Does the APEX Clutch Achieve its Versatility?

APEX is the culmination of of innovative design and USA-made construction that adds up to a meticulously tuned and tested system featuring a slew of proprietary clutch technology.

Fixed-Pin Hub

Traditional hub designs use machined grooves in the aluminum to retain drive plates, commonly causing notching inside the grooves through normal use and eventually leading to hub replacement. Fixed-Pin is a patented new hub design exclusively from Rekluse that uses steel-on-steel contacts to retain the drive plates to eliminate that notching wear and the performance degradation that comes along with it. As an added bonus, it also provides a noticeable improvement in clutch modulation and control riders can feel at the lever.

TorqDrive

TorqDrive friction disk technology allows for up to 8 additional friction disks over the OEM clutch stack. This additional plate capacity is a major factor in allowing the clutch lever modulation to remain easy throughout various power levels and RPM ranges. Plus, at the end of the day, more friction disks = more torque capacity and therefore improved power transfer to the rear wheel. This is true whether the engine is stock, has bolt-on upgrades, or is an all-out high-HP build pumping out 200 ft.-lbs.

Two Sets of Clutch Springs

APEX uses 6 clutch springs in total, but each APEX clutch system is supplied with two different sets of springs. These differing spring rates, one stiffer and one softer, allows riders to tune their clutch system with a total of 3 spring rate combinations depending on the torque output of the engine and rider’s clutch feel preference.

Core Components

In addition to the Fixed-Pin hub, APEX is also supplied with a billet, hard-anodized pressure plate. These billet internal components, referred to as ‘Core’ components, help maximize durability through both the strength of the parts themselves and their oil flow-improving designs that increase oiling throughout the clutch. This helps keep the heat down and allows the entire clutch system to perform longer and more consistently.

Additional Hardware

At the end of the day, the details make the difference, and our basket sleeves are a perfect example of that. We should preface this by mentioning that APEX clutch systems for Harleys are available with or without a complementary clutch basket upgrade as well. Should you choose to keep your OEM basket, APEX is supplied with basket sleeves that simply slide in between the basket tangs and protect them from notching.

 

So, What is the APEX Clutch Anyway?

The APEX clutch is a manual clutch system that takes the capabilities of a traditional coil spring clutch to a completely new level. This clutch is an innovative system that uses a combination of proprietary technology and design, including Fixed-Pin, TorqDrive, and Core. APEX improves lever feel, power delivery, rideability, longevity, and torque capability, just to name a few.

Which Harley Models will APEX be Available for?

APEX will be available for a wide range of Harley-Davidson models powered by Twin Cam and Milwaukee-Eight (M8) big twin engines, covering year models from 2007 to current.

 

Introducing our Most Advanced Harley Auto Clutch: RadiusCX

Rekluse auto clutch technology has delivered game changing improvement to the V-twin riding experience, and now it’s been implemented into our revolutionary V-twin clutch system. The RadiusCX auto clutch system combines the unmatched auto functionality of the EXP disk with the extreme performance versatility and durability of the APEX™ clutch system. RadiusCX is the complete package for any rider looking to get the absolute most out of their riding experience, including ease of daily riding and navigating traffic, more power and torque capacity, maximized durability, and rider-focused tunability.

How Does RadiusCX Make Your Harley Clutch Better?

• EXP disk allows for starting and stopping without touching the clutch lever, providing improved usability and hookup for quick, strong takeoffs and smoother traffic navigation
• Optimized EXP design for ideal clutch engagement and disengagement in Harley engines
• Clutch lever remains fully operational at all times
• More friction disks in the same footprint utilizing TorqDrive friction technology deliver a substantial increase
  in torque capacity, clutch engagement and power transfer to the rear wheel
• Patented Fixed-Pin hub uses steel-on-steel contact with clutch separator plates, eliminating notching and performance degradation inherent with other clutches, while providing improved clutch modulation and control
• Billet aluminum Core components including pressure plate and Fixed-Pin inner hub reduce clutch operating temperatures
  with improved oil flow for longevity and consistent performance
• Tunable to power needs and rider preference with interchangeable clutch spring and EXP spring combinations
  to match engine output and desired engagement while minimizing lever force

RadiusCX combines all of Rekluse’s latest performance clutch technology for the ultimate Harley clutch system.

How Does the ‘Auto’ Function of RadiusCX Work?

Learn more about our EXP auto technology here

 

What’s included with RadiusCX for Harley?

• EXP disk – Provides automatic
  clutch functionality
• Throw-out adjuster – Easy setup and tunability of auto clutch engagement
• Fixed-Pin billet hub – Patented proprietary design and technology
• Billet, hard anodized pressure plate
• Complete clutch pack featuring TorqDrive friction disks
• Two sets clutch springs – Varying spring rates/stiffness for fine tuning, with hardware
• Basket sleeves to improve longevity with OEM basket
• + Optional forged clutch basket!