4.5″ OT-V Carbon Racing Clutches


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4.5" OT-V Carbon Racing Clutches - Official Clutch of the Indy Lights Series

Tilton’s 4.5″ OT-V carbon racing clutches offer a unique combination of extremely low inertia, high torque capacity, high heat capacity, smooth engagement characteristics and long life. Because of these features, 4.5″ carbon clutches are used predominantly in the following applications:

  • Road racing
  • Open wheel/Formula

The carbon matrix plates (driven and floater) do not warp from heat, providing consistent shifting and minimizing heat-related clutch failures. The smooth engagement characteristics of the carbon plates provide excellent drivability and reduce shifting shock to other driveline components. Through the use of additional pressure plates (shims) and periodic rebuilds, 4.5″ OT-V carbon racing clutches offer a long-life option for the serious racer. These are a few of the reasons that Tilton’s 4.5″ carbon clutch is the official clutch of the Indy Lights series.

Extremely Low Inertia
The moment of inertia for Tilton’s 4.5″ OT-V carbon racing clutches ranges from just 11.4 lb-in2 (.0033 kg-m2) to 15.3 lb-in2 (.0045 kg-m2). This is the lowest M.O.I. range of any Tilton clutch, and it translates to extremely quick acceleration and shifting capability.

Tilton’s 4.5″ carbon clutches range in weight from 2.6 lbs (1.2 kg) to 3.8 lbs (1.8 kg).

High Torque Capacity
Tilton’s 4.5″ carbon clutches can handle 230 lb-ft (313 Nm) of torque per plate.

Long Life
Through the use of replacement pressure plates (or shims, designed to compensate for normal carbon plate wear) as well as periodic rebuilds, Tilton carbon racing clutches can boast a considerable lifetime.

Decades of Experience
Tilton Engineering invented the carbon/carbon racing clutch and patented the drive system in the 1980s. It was the first carbon/carbon clutch ever to win a Formula One Grand Prix (Ayrton Senna’s Lotus-Honda at the 1980 US Grand Prix in Detroit). Since then, Tilton carbon/carbon clutches have been continually refined to be the best carbon clutches on the market. They have seen multiple victories in races worldwide, from the 24 Hours of Le Mans to the Baja 1000.

Capitalizing on experience gained over the past decades, Tilton carbon clutches have evolved to become second to none in quality. Each is built using the finest materials, the latest in manufacturing processes and is held to strict quality control standards. As part of their build process, 4.5″ OT-V carbon racing clutches are rigorously tested and documented before being delivered to the customer.


Plate count

Torque Capacity

Release Load*


















* Values listed are typical for release bearings with the recommended 38mm contact diameter. Larger contact diameters will increase release load.
** Weight and M.O.I. include pressure plate, carbon floater plates, carbon discs and steel hub, and may vary based on your particular spline.

Tilton offers two different styles of every 4.5″ carbon clutch configuration: one designed to be compatible with a step-type flywheel, and another for pot-type (“no-step”) flywheels. Step flywheels have a .100″ step for contact with the friction material of the clutch, so clutches made for this application will have a .100″ height difference between the bottom friction disc and the end of the clutch cover legs (the mounting points). Pot flywheels don’t have this step, so the friction disc and clutch cover legs will be flush on clutches designed for them.

Step-Type vs Pot-Type - Clutch Flywheel

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