What is the main advantage of a twin-disc clutch over a single-disc setup?

A twin-disc clutch uses two friction surfaces instead of one. This doubles the surface area for engagement, which significantly increases the amount of torque the clutch can handle and helps dissipate heat more effectively under heavy use.

What does the 'ST-Trim' designation mean for this SPEC clutch?

The ST-Trim designation from SPEC generally indicates a clutch designed for high performance with an emphasis on maintaining reasonable drivability. It often incorporates features like sprung hubs to reduce drivetrain shock and vibration compared to a solid-center performance clutch.

Does this clutch kit include everything needed for installation?

This kit includes the twin-disc clutch assembly and a billet steel flywheel. It is recommended to inspect and potentially replace other drivetrain components like the pilot bearing and rear main seal during installation, as these are not always included.

Specifications

Brand: SPEC
Part #: SB53ST

Spec 2009+ BMW 335i ST-Trim Twin Disc Clutch Kit

Name: Spec 2009+ BMW 335i ST-Trim Twin Disc Clutch Kit
Brand: SPEC
SKU: spec-spec-2009-bmw-335i-st-trim-twin-disc-clutch-kit-t14-131433
Price: 1995.80 USD
Availability: BackOrder

$1995.80

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Spec 2009+ BMW 335i ST-Trim Twin Disc Clutch Kit.

Key Features

Fits 2009 and up BMW 335i.
Twin disc design increases torque capacity and heat management.
ST-Trim designation offers a balance of performance and drivability.
Includes a billet steel flywheel for enhanced strength and stability.
Designed to handle significantly more power than the stock clutch.

This clutch kit is designed for 2009 and up BMW 335i models. Please verify fitment with the manufacturer's specific application guide.

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About this part

Product Details

SPEC is known for making well-built drivetrain components, and their ST-Trim Twin Disc Clutch Kit for the 2009 and up BMW 335i is a prime example of their work. This kit is designed to handle significantly more power than the stock clutch, making it a solid choice for enthusiasts looking to upgrade their vehicle's performance. If you're pushing your 335i beyond its original limits, this clutch is engineered to keep up.

This twin-disc setup features two friction discs, which distribute the torque load over a larger surface area. This not only increases the clutch's holding capacity but also helps to manage heat buildup more effectively, especially during aggressive driving or repeated launches. The ST-Trim designation typically means it's built for a balance of high performance and reasonable drivability, often using a sprung center hub design on the discs to help absorb some of the shock and vibration that can come with a performance clutch. The kit includes a billet steel flywheel, which is stronger and more stable than cast iron options, ensuring a solid mating surface for the clutch discs and pressure plates.

When installing a twin-disc clutch like this, it's important to ensure your flywheel and pilot bearing are in good condition, as they are critical for proper clutch operation. This kit is a comprehensive solution for upgrading your 335i's clutch system, offering improved performance and durability for demanding applications. Always refer to the manufacturer's installation instructions for the most accurate guidance.