Spec 3/03-06 BMW 325 2.5L 6spd/04-06 330 (E46) 6spd ZHP/04-05 530 3.0L 6spd ZHP Steel Flywheel
SPEC SB07S is a billet steel single-mass flywheel for the six-speed manual BMW sixes: the E46 325i six-speed built from March 2003, the 330i and 330Ci six-speed ZHP through 2006, and the 2004-2005 530 3.0L six-speed. People looking for it usually have a six-speed car with a dual-mass flywheel that knocks at idle or shudders pulling away, and they want to fix it once instead of buying another dual-mass unit that will wear the same way. It is also the flywheel SPEC builds its six-speed single-mass clutch kits around, so it is the starting point for a stronger clutch on a tuned or track-driven ZHP.
These six-speed cars left the factory with a dual-mass flywheel, a two-piece assembly with springs between the halves that soak up the pulses of the inline six before they reach the gearbox. Once those springs and the internal bearing wear, the flywheel has to be replaced, because a dual-mass unit cannot be machined back to spec. SB07S swaps that assembly for one solid piece of billet steel. SPEC lists it at 22 lb. With no springs inside there is nothing to wear except the friction face, and that face can be resurfaced at the next clutch change.
The six-speed cars are a separate catalog from the five-speeds. SPEC covers the five-speed E46 and E39 with its SB64S flywheel, and the two are not interchangeable, so the gearbox in your car decides which one you need.
With the gearbox out, a dual-mass flywheel is judged by rotating the secondary mass against the primary and rocking it for tilt, then comparing the play to the limit for the car. Before you get that far, rule out the clutch itself: a full-throttle pull in a high gear from low rpm that shows the tach climbing faster than road speed means the disc is slipping. Our slipping diagnosis guide walks through that test, and the flare vs. slip guide helps separate clutch slip from other drivetrain problems. If you are pricing the whole job, our manual repair cost breakdown shows where the labor goes.
Our listing covers the BMW 325 2.5L six-speed from March 2003 through 2006, the 330 E46 six-speed ZHP 2004-2006 and the 530 3.0L six-speed 2004-2005. SPEC's own chart lists SB07S for the E46 325 six-speed from March 2003, the E46 330 six-speed and ZHP for 2003-2006, the 530 for 2004-2005 and the Z4 2.5L for 2003-2004, along with European diesel models. The March 2003 cutoff matters: an earlier 325i, and every five-speed car, is cataloged on a different flywheel such as the SPEC SB64S. Check the build month on the door-jamb label and count the gears on the shift knob, or send us your year and VIN and we will confirm it. Other flywheels and drivetrain hardware are in our hard parts collection.
The driveshaft has to come out for this job on an E46, so it is the right time to fit a new flex disc and center support bearing if the old ones are cracked or soft.
| Brand | SPEC |
| Part number | SB07S |
| Fits | Spec 3/03-06 BMW 325 2.5L 6spd/04-06 330 (E46) 6spd ZHP/04-05 530 3.0L 6spd ZHP Steel Flywheel |
| Vehicle fitment | BMW 325 (2003-2006) |
| Type | Flywheels |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. SPEC lists SB07S for the six-speed cars only. The five-speed E46 and E39 models are covered by the SPEC SB64S flywheel. Count the gears on your shift pattern or send us the VIN.
Yes. SPEC lists the E46 325 six-speed from March 2003 on. Check the production month on the door-jamb label; a car built before March 2003 should be confirmed with us before ordering.
It is not recommended. The factory clutch is designed around a dual-mass flywheel. SPEC pairs SB07S with its single-mass six-speed kits, starting with the SB071S-2 Stage 1, so plan to buy a matching clutch with it.
SPEC lists SB07S at 22 lb. It is steel, so it is heavier than SPEC's aluminum SB07A option but keeps more of the smooth low-speed feel and can be resurfaced.
Usually a little. Without the dual-mass springs you may hear some gear rattle in neutral at idle. It goes away when the clutch pedal is pressed and does not mean anything is wrong.
