Spec Clutch Aluminum Flywheel Non-Ratcheting BMW 335 135 435 535 N55

SPEC offers thousands of applications, including a wide variety of performance stages, multi-disc assemblies, tuned billet flywheels, lightweight options and more. All designed, hand-built and tested in the U.S.A.

SPEC Flywheels are CNC manufactured at an unheard-of .001 tolerance, in an industry where the standard is .010. This precision manufacturing process ensures perfect balance and a perfectly flat bedding surface for the clutch disc, both of which also contribute to the ultimate in safety for competitive environments. All SPEC flywheels carry SFI certification.

The automotive component most responsible for insuring optimum clutch performance and life is the flywheel. The flywheel's contribution to power transfer is three-fold.

Firstly, the flywheel should provide a consistent and friction enhancing surface for the clutch disc. Flywheels also aid in proper inertia, which is determined by the flywheel weight. Inertia controls the ratio of power to acceleration and can make a vehicle faster or slower based on gear ratio, tire type, vehicle weight, power output and even the location in the powerband output is achieved. The weight of a flywheel and amount of inertia it provides can also effect drivability. Lastly, the flywheel must provide a true balance at rpm, which means no dimensional runout that produces engine damaging and power robbing vibrations and allows smooth engine revolutions.

To allow for specific inertia needs, SPEC flywheels are made in high carbon billet steel and aircraft quality billet aluminum. The aluminum and most steel SPEC units are rebuildable and feature a replaceable steel friction plate that is made from a friction- enhancing steel metal specially formulated for optimum clutch bedding and holding power. The aluminum and steel materials provide a light and medium weight option for all types of racing. SPEC spends a lot of time and effort on research and development of optimum flywheel dimensions and weights for all types of driving and racing and can optimize your MOI (moment of inertia) to maximize your car's output and performance.

Types of Driving: Street, Drag, Pulling, Autocross

REQUIRES A NON-RATCHETING CLUTCH. Can not be used with OE style clutches

Fitment:
BMW 135i 2011-2012
BMW M140i 2015-2019
BMW M235I 2012-2016
BMW M240i 2015-2020
BMW 320i (F30) 2012-2015
BMW 328d (F30) 2012-2015
BMW 328i (F30) 2012-2015
BMW 335i 2011-2017
BMW 340i 2014-2019
BMW 428i 2013-2015
BMW 435i 2013-2017
BMW 440i 2015-2020
BMW 535i (F10) 2011-2017
BMW M1 2011
BMW X1 2010-2016
BMW Z4 2011-2016

Other Part Numbers:
SPEC Clutch #SB55A-2