Raceseng Custom Prolix Shift Knob (NLA)


Above image is not a color option, it is to show you where the custom color you select will be on the shift knob. More photos are below in the description.

Shape, height and mass merge. The Prolix features a sphere shape with peaked tangent contours that seamlessly fits in your hand. The tall profile increases your mechanical leverage and 685 grams of mass smooth out the shift. Create your own custom Ashiko by selecting from our unique collection of finishes and signature engraving styles.


- Custom orders are made per order and have a 6-8 week lead time due to COVID-19
- Custom orders can't be edited once the order is placed
- Custom orders can't be cancelled, returned or exchanged
- You will receive a shipping notification as soon as your order ships
- Do not email asking for an order update

Choose between 30 different finishes listed below:

Engraving Options:

Prolix / Custom

Part of our Mass Series collection, the Prolix is weighted for performance shifting. The utilization of stainless steel creates a shift knob with mass to smooth out notchy shifting.


COLLECTION | Mass Series

PROFILE | Tall Profile Sphere

MATERIAL | 303 Stainless Steel + 6061 Billet Aluminum Adapter


WEIGHT | 1.5 lbs. - 685 grams

HEIGHT | 3 1/2" - 89 mm

DIAMETER | 2" - 51 mm

COUNTERBORED | For Reverse Lockouts and Shift Boot Retainer


With or without? All depends on your personal preference. Our stocked engraving styles were designed to be graphically clean while giving your shift knob a unique aesthetic.

Click the Engraving Options button to see all of our engraving styles.


With the weight in all the right places, Prolix redefines your shifting experience through the look and feel of how you shift into gear. You will experience smoother and faster shifts!

How? Weight in motion directly relates to how an object will react to an opposing force. In this case, the opposing force is the gate pattern and counter springs that are connected to your shift arm that tell you the shift pattern of your car. The difference felt when shifting into the next gear requires far less effort due to the additional momentum created by the increased mass.

Threaded Adapter

Non Threaded Adapter

The optional shift boot retainer keeps your shift boot securely retained to the bottom of your shift knob. Simply attach your shift boot to the retainer with the supplied zip tie and slide the boot retainer into the bottom of the shift knob.

You DO NOT need a shift boot retainer if you have a Non-threaded Adapter (NTA) or a car with a reverse lockout.


We specifically designed the Prolix to fit small to large size hands. The 2" or 51mm sphere diameter will fit smaller size hands while still providing a weighted shifting experience. If you are unsure of your hand size, please click the link below to reference our hand sizing chart.

Angled Overhand



The Prolix was designed for angled overhand and overhand shifting positions. The sphere shape makes for a comfortable angled overhand shifting position. The overhand shifting position is further enhanced with the undercut sphere shape which provides a firm location for your index and middle finger to grip.


We believe in the power of the design process to create incredible products. Every shift knob start it's life as an idea that is translated into countless ideation sketches where form and details evolve. We take those sketches and further develop them in solid modeling software to define the form and ergonomics of the shift knob. The goal of this process is to perfect the balance between form and function to create an unparallelled product and brand experience.


For the integrity and craftsmanship of our products, we do our manufacturing in house. We are proud to get our hands dirty crafting the very products we create.

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