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Qnium Radial Thumb Brake Master Cylinder 12mm piston

Thumb Brake

Qnium Radial Rear Thumb Brake Master Cylinder 12mm

The Radial Thumb Brake from Qnium is one of the most optimized thumb brakes on the market for the rear wheel. As a rider you have a lot more feeling in your thumb than in your foot. The Qnium Radial Thumb Brake makes it easier to operate the rear brake in a very controlled way. This high-end thumb brake is very popular in the Moto3 class. A brake lever is not an option on these bikes, as Moto3 riders are required to use the clutch lever. When you mount the Rear Master from Qnium on your bike, you can continue to use your foot brake.

Used in Moto2, Moto3, and in other FIM world championships. Drivers like Tony Arbolino and Dennis Foggia managed to win Grand Prix races with the revolutionary Qnium Thumb Brake. In 2019 Lorenzo Dalla Porta also used the Qnium’s Radial Thumb Brake, when he became World Champion Moto3.

Made in The Netherlands
Limited Supply: only 2 remaining
Availability: On-hand inventory ships within 24 hours. Due to material shortages we have been seeing up to 6 weeks on resupply. We try to keep this product in stock so grab it while we have it. Orders placed will be allocated to incomming stock.
Pricing: $799.00



Many riders like to control the rear brake with their left hand. In your fingers you have a lot more feeling than in your foot. In that case you can opt for the Qnium Radial Thumb Brake.

This radial thumb brake is optimized at all points to get the brake feeling to the highest possible level. The pivot point and the pivot point of the trade adjustment are both double bearings, which means that the friction around 25 bar pressure in both pivot points are eliminated. This results in less force with the thumb to get the same brake pressure.

More importantly, the feeling improves so that the rear brake is easier to control.

Technical Specifications:
Handlebar clamp: 22mm
Adjustable lever length 115mm – 142mm
Adjustable lever position with rotary 'Q knob'
Material: Aluminum 6082, High gloss anodized.
Color: Titanium, Platinum, Orange
Piston: 12mm – Aluminum 7075
Double Bearing Lever Pivot Point
Pivot: Pushrod pivot point double bearing
Brake oil DOT 4.0 or 5.1
15mL Reservoir & oil resistant brake hose
Banjo: Pro-Bolt Titanium, Race Spec
Bolts: Pro-bolt Titanium, Race Spec
Venting nipple: Pro-bolt Titanium
Custom seal design for better braking feel.
Custom Brake line from Left Hand Brake to Rear master near foot will be required, Highly recommend to get the Qnium Rear Brake Master Cylinder for ability to use rear foot brake as well and compliment overall feel of the rear brake.


Shipping Information

  • Item Requires Shipping
  • 3.0 lbs.
  • W7.0000” x H5.0000” x L10.0000”

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