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

A twin disc clutch has two friction discs, which increases the total friction surface area. This allows it to handle significantly more torque and dissipate heat more effectively than a single disc clutch, making it ideal for high-performance applications.

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

The 'ST-Trim' from SPEC typically indicates a clutch designed for street use that still offers a substantial upgrade in torque capacity. It aims to provide a good balance between performance and drivability for everyday driving conditions.

Does this clutch kit come with everything needed for installation?

This kit includes the twin disc clutch assembly and pressure plate. However, it's important to note that clutch installations often require additional components like a pilot bearing, release bearing, and potentially resurfacing or replacing the flywheel, which may need to be purchased separately.

Specifications

Brand: SPEC
Part #: SB53SST-3

Spec 07-09 BMW 135i/335i/535i ST-Trim Twin Disc Clutch Kit w/6 Bolt Crank

Name: Spec 07-09 BMW 135i/335i/535i ST-Trim Twin Disc Clutch Kit w/6 Bolt Crank
Brand: SPEC
SKU: spec-spec-07-09-bmw-135i-335i-535i-st-trim-twin-disc-clutch-kit-w-6-bolt-crank-t14-147533
Price: 1847.04 USD
Availability: BackOrder

$1847.04

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Key Features

Fits 2007-2009 BMW 135i, 335i, and 535i models with a 6-bolt crank.
ST-Trim designation offers improved torque capacity suitable for street use.
Twin disc design increases surface area for better heat dissipation and higher holding capacity.
Includes a high-strength pressure plate engineered to work with the twin discs.
Built with well-made materials for a balance of performance and durability.
Designed for vehicles with a 6-bolt crankshaft configuration.

This clutch kit is specifically designed for 2007-2009 BMW 135i, 335i, and 535i models equipped with a 6-bolt crankshaft. Please verify your vehicle's specific configuration before purchase.

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About this part

Product Details

This SPEC ST-Trim Twin Disc Clutch Kit is built for the 6-bolt crank setup found in 2007-2009 BMW 135i, 335i, and 535i models. Twin disc clutch setups are designed to handle significantly more torque than a single disc, making them a popular choice for modified vehicles or those looking for a more robust drivetrain connection. The ST-Trim designation from SPEC indicates a focus on street drivability while still offering a substantial increase in holding capacity over stock.

The core of this kit features two friction discs, which distribute the clamping force over a larger area. This not only increases the torque capacity but also helps to reduce heat buildup during engagement, leading to a longer clutch life under demanding conditions. The kit includes a high-strength pressure plate designed to work in conjunction with the twin discs, ensuring consistent engagement and release. SPEC uses well-built materials throughout the assembly, aiming for a balance between performance and longevity for street use. The 6-bolt crank configuration is specific to certain BMW engine variants within this model range, so confirming your vehicle's setup is crucial before installation.

Installing a twin disc clutch is a more involved process than a standard single disc replacement. It often requires specialized tools and a good understanding of drivetrain components. Because this is a performance-oriented upgrade, it's recommended to have a professional mechanic perform the installation to ensure everything is set up correctly. This kit is designed to be a complete solution for upgrading your clutch system, providing the necessary components for a robust and reliable performance upgrade.