Counterweights

Counterweights: the small part that makes a flywheel swap spin true

A counterweight bolts to the flywheel or flexplate to restore rotating balance when you change from one clutch and flywheel setup to another. Externally balanced engines and certain rotary applications don't carry all their balance on the crank, so when you move to a different flywheel you need matching counterweights to keep the assembly from vibrating. Skip it and you get shake, bearing wear, and a driveline that never feels settled. Fit the right one and the whole rotating mass turns smooth from idle to redline.

What ThreePiece stocks

This is a focused category: 4 products in stock from 2 brands, Competition Clutch and McLeod Racing. Prices currently run from $64 to $194, which is the live range on what is on the shelf right now, not a standing offer. Three of the four listings carry fitment data, covering Mazda applications across a year span from 1986 to 2024, plus a GM bolt-on kit.

Concrete examples: the Competition Clutch 89-99 Mazda RX7 Counterweight with bolts (CW-MZD-01) and the 04+ Mazda RX8 Counterweight with bolts (CW-MZD-03) both sit at the top of the range at $193.72 and ship with hardware. At the other end, the McLeod Bolt On Counter Weight Kit for GM (560222) is $63.72.

How to choose

The choice here is driven almost entirely by application, not preference. The Competition Clutch parts are rotary-specific, one for the RX7 and one for the RX8, so pick by chassis and year. Both come with bolts, which saves you sourcing hardware separately. The McLeod GM kit is the budget-friendly bolt-on option and covers a different platform entirely. Because this is a small, application-locked range, confirm your exact year and clutch/flywheel combination before ordering so the counterweight matches the balance spec of the setup you are running.

What else you need with it

A counterweight is part of a driveline job, so plan the rest of the assembly at the same time. Look at Bearings if you're in that deep, and check Gasket Kits and Head Gaskets if the engine is apart. For a fresh build, browse Pistons and keep the cooling side covered with Radiators. All of these sit under the wider Engine Components section.

Fitment help and ordering

If you're unsure which counterweight matches your clutch and flywheel combination, call our fitment help line at 813-535-5801 or use the contact page before you buy. Every order ships free, and Affirm and Katapult financing is available at checkout. Have a question about how these parts work together? The FAQ is a good first stop.

Counterweights: the small part that makes a flywheel swap spin true

A counterweight bolts to the flywheel or flexplate to restore rotating balance when you change from one clutch and flywheel setup to another. Externally balanced engines and certain rotary applications don't carry all their balance on the crank, so when you move to a different flywheel you need matching counterweights to keep the assembly from vibrating. Skip it and you get shake, bearing wear, and a driveline that never feels settled. Fit the right one and the whole rotating mass turns smooth from idle to redline.

What ThreePiece stocks

This is a focused category: 4 products in stock from 2 brands, Competition Clutch and McLeod Racing. Prices currently run from $64 to $194, which is the live range on what is on the shelf right now, not a standing offer. Three of the four listings carry fitment data, covering Mazda applications across a year span from 1986 to 2024, plus a GM bolt-on kit.

Concrete examples: the Competition Clutch 89-99 Mazda RX7 Counterweight with bolts (CW-MZD-01) and the 04+ Mazda RX8 Counterweight with bolts (CW-MZD-03) both sit at the top of the range at $193.72 and ship with hardware. At the other end, the McLeod Bolt On Counter Weight Kit for GM (560222) is $63.72.

How to choose

The choice here is driven almost entirely by application, not preference. The Competition Clutch parts are rotary-specific, one for the RX7 and one for the RX8, so pick by chassis and year. Both come with bolts, which saves you sourcing hardware separately. The McLeod GM kit is the budget-friendly bolt-on option and covers a different platform entirely. Because this is a small, application-locked range, confirm your exact year and clutch/flywheel combination before ordering so the counterweight matches the balance spec of the setup you are running.

What else you need with it

A counterweight is part of a driveline job, so plan the rest of the assembly at the same time. Look at Bearings if you're in that deep, and check Gasket Kits and Head Gaskets if the engine is apart. For a fresh build, browse Pistons and keep the cooling side covered with Radiators. All of these sit under the wider Engine Components section.

Fitment help and ordering

If you're unsure which counterweight matches your clutch and flywheel combination, call our fitment help line at 813-535-5801 or use the contact page before you buy. Every order ships free, and Affirm and Katapult financing is available at checkout. Have a question about how these parts work together? The FAQ is a good first stop.