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Description
Spec Stg 3+ Steel Flywheel - BMW F30 335iSPEC 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
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 flywheels 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 cars output and performance.
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★★★★★ 5
Thin booklet but a good read
Format: Paperback
Very thin booklet, but a good read with encouraging words.
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Reviewed in the United States on May 11, 2026
★★★★★ 5
Book
Format: Paperback
Excellent read.
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Reviewed in the United States on June 2, 2026
★★★★★ 4
God Promises
Format: Kindle
The message in “Surviving the Mess of Life” by Max Lucado is well worth reading. It reminded me that no matter what I’m going through or how messed up my life is, the importance to stop and remember Gods’ promises in the Bible.
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Reviewed in the United States on August 17, 2025
★★★★★ 5
Motivational
Format: Paperback
This book was a gift. A special person that's going through tough times. I know it's been a blessing. Easy to read, soft cover, portable, anywhere you go light weight. Beautiful product
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Inspirational!
Format: Paperback
Enjoyed reading this!
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Reviewed in the United States on May 28, 2026