Clutch Masters Lightweight Flywheel for K20A/K20Z/K24A

Clutch Masters Lightweight Flywheel - K-Series Honda & Acura (K20 / K24)

Your factory flywheel is heavy, and that weight is quietly dulling how your K-series revs. A flywheel's job is to store rotational energy, and the lighter it is, the less energy the engine wastes spinning it, so the motor revs faster, responds quicker, and feels dramatically more alive. Clutch Masters' lightweight flywheels for the K-series drop a big chunk of that mass, and the difference is immediate: snappier throttle response, faster revs between shifts, and a car that feels eager instead of lazy. Whether you daily your Si or chase lap times in your RSX Type-S, this is one of those upgrades you feel every single time you touch the throttle.

Steel Or Aluminum? Here's How To Choose

This page offers two versions, and picking the right one comes down to how you drive, so let's break it down honestly.

Go with the steel flywheel if you want the best all-around upgrade for a street car. It's lighter than stock for that quicker-revving feel, but it's built from robust steel for longevity and reliability, and it keeps enough mass that the car is still easy and smooth to drive in traffic and from a stop. For most people, especially daily drivers, this is the right choice. It's the durable, do-it-all option.

Go with the aluminum flywheel if you want maximum response and you're chasing performance above all. It's significantly lighter than the steel version, which slashes rotational inertia and makes the engine rev even faster and change gears even quicker. That's a huge advantage on track or in an aggressive build. The tradeoff to know going in: a very light flywheel takes a little more finesse to launch smoothly from a stop and can feel busier in stop-and-go traffic. If you prioritize outright response and don't mind that, aluminum is the weapon. If you want a flywheel you never have to think about in daily driving, steel is the safer bet.

What A Lighter Flywheel Actually Does

The gain here is all about rotational mass. Every pound you take off the flywheel is weight the engine no longer has to accelerate, so more of your power goes to moving the car and revving the motor instead of spinning a heavy disc. You'll feel it as quicker throttle response, faster rev-matching on downshifts, and snappier acceleration, particularly noticeable in the lower gears where the engine is revving hardest. It's not about peak horsepower on a dyno, it's about how much more responsive and connected the whole car feels to drive.

Read This First: You Need An RSX Type-S Clutch

This is the requirement that matters most, so confirm it before you order. Both the steel and aluminum flywheels require the use of an RSX Type-S clutch. The flywheel is designed around that clutch setup, so if your car has a different clutch, you'll need to run the RSX Type-S clutch for everything to bolt up and work together correctly. This is especially important for base-model and Si owners to plan for. Sort out your clutch before you buy the flywheel so the whole package integrates the way it should.

Fits Both 5-Speed And 6-Speed K-Series

These flywheels fit a broad range of K-series Honda and Acura cars, and both the 5-speed and 6-speed manual transmissions:

Both variants require an RSX Type-S clutch regardless of which car you're installing in. Confirm your clutch setup before ordering.

Who Should Run This Flywheel

This is for the K-series owner who wants their engine to feel sharper and rev freer, whether that's a daily-driven Si you want to wake up or a built RSX Type-S you're setting up for the track. Decide honestly how you drive, steel for the durable everyday upgrade, aluminum for maximum response, make sure you've got the RSX Type-S clutch to pair it with, and get ready for a car that feels noticeably more eager every time you get on the throttle.

Fits: 2002-2006 Acura RSX Base and Type-S, 2004-2008 Acura TSX, 2002-2011 Honda Civic Si (K20 / K24), 5-speed and 6-speed manual. Options: lightweight steel (durable, best all-around) or lightweight aluminum (lightest, maximum response). Benefit: reduced rotational mass for quicker revs, sharper throttle response, and faster shifts. Required: RSX Type-S clutch. Type: direct-fit lightweight flywheel.