ACT 06-15 Mazda Miata MX-5 2.0L XACT Streetlite Flywheel
The ACT 601140 XACT Streetlite is a lightweight chromoly flywheel for the 2006-2015 Mazda MX-5 Miata (NC) with the 2.0L engine. NC owners usually shop for it during a clutch job: the old flywheel needs resurfacing anyway, and swapping to a lighter one lets the engine rev up quicker between shifts on autocross courses, track days and back roads. At 10.4 lb, it takes a meaningful amount of rotating mass off the crank.
The flywheel bolts to the crankshaft, gives the clutch disc its friction face, carries the starter ring gear and stores rotating energy. Less mass there means the 2.0L picks up and drops rpm faster, which makes rev-matched downshifts easier and the car feel livelier in the lower gears. ACT forges 601140 from chromoly steel in one piece, CNC machines and dynamically balances it, and induction-hardens the 112-tooth ring gear. The friction surface is 240 mm (9.4 in), and it carries SFI 1.1 certification.
ACT calls the Streetlite its most durable flywheel line and recommends it for street and race use. Expect noticeably quicker engine response and OE to mild gear rattle at idle. Being one piece, it has no inserts to warp and no ring gear to work loose, and it can be resurfaced at the next clutch job.
Most flywheel problems are found with the transmission out. Look for cracks running from the bolt holes or across the face, heavy bluing and glazed spots, then check the ring gear for chipped teeth. If the clutch slips on the road, confirm it is really the clutch first; our slipping diagnosis guide covers the road test, and the flare vs. slip guide helps separate real slip from other drivability issues. Since the labor to reach the flywheel is the same as a clutch job, our manual repair cost guide is useful for planning both at once.
ACT lists 601140 for every 2006-2015 MX-5 Miata 2.0L trim in its fitment table, including the five-speed Base, SV and Sport cars, the six-speed Touring, Grand Touring, GT and Club cars, the Special Edition, the 2015 25th Anniversary Edition and the GS and GX trims sold in Canada. It is not listed for the 1990-2005 NA and NB cars or the 2016-up ND, which use different flywheels. If your NC has had an engine or gearbox swap, send us the year and VIN before ordering. More NC clutch parts are on our rebuild kits page and hard parts page.
| Brand | ACT |
| Part number | 601140 |
| Fits | ACT 06-15 Mazda Miata MX-5 2.0L XACT Streetlite Flywheel |
| Vehicle fitment | Mazda Miata Mx-5 (2006-2015) |
| Type | Flywheels |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Yes. ACT's fitment table lists 2006-2015 MX-5 Miata 2.0L cars in both five-speed trims (Base, SV, Sport) and six-speed trims (Touring, Grand Touring, GT, Club).
ACT lists 601140 at 10.4 lb. It is a one-piece chromoly steel flywheel with a 240 mm friction surface and a 112-tooth ring gear.
No. ACT lists 601140 only for the 2006-2015 NC with the 2.0L engine. NA, NB and ND cars use different flywheels.
ACT's page for 601140 does not call for a specific clutch. Most owners fit a new clutch at the same time because the labor is the same, and a worn disc on a fresh flywheel face will not last.
ACT describes noticeably improved engine response with OE to mild gear rattle. Expect to use a touch more throttle when pulling away from a stop until you get used to it.
Yes. ACT states its flywheels are serviceable and can be resurfaced with no need to buy additional parts.
