SKU: 56575517395

Rear (300X20mm) Stoptech Power Slot Rotors - E90/2 328i/325i

Sale price$186.70 Regular price$207.45
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Description

Rear (300X20mm) Stoptech Power Slot Rotors - E90/2 328i/325iPower Slot Rotors Power Slot rotors are 1 piece, slotted, direct replacement discs for your factory brake system and stock calipers. They offer improved cooling as well as other advantages the competition doesn't offer. Launched in 1998, Power Slot was the first premium slotted replacement rotor program in North America. Innovations include e coating, double disc grinding, full machining, mill balancing and center split castings, as well as the



Power Slot Rotors

Power Slot rotors are 1-piece, slotted, direct replacement discs for your factory brake system and stock calipers. They offer improved cooling as well as other advantages the competition doesn't offer. Launched in 1998, Power Slot was the first premium slotted replacement rotor program in North America. Innovations include e-coating, double-disc grinding, full machining, mill balancing and center-split castings, as well as the availability of directional vanes, cryogenic treatment and the use of Power Alloy. Today, Power Slot covers more than 2500 applications, all machined in Power Slot's California manufacturing center. Every Power Slot rotor is a direct replacement for a factory brake rotor, allowing the retention of factory calipers in the system.

Most Power Slot rotors match the original factory cooling vane design. In the most popular sports car and light truck applications, Power Slot has improved the design by using directional (left- and right-handed) vanes to improve cooling. This represents a distinct upgrade from the original equipment rotors, which usually feature a straight vane or pillar vane design. The directional vane is a more efficient air pump. The resulting increase in airflow translates into greater resistance to brake fade and faster recovery from temperature spikes generated by aggressive braking maneuvers.

Power Slot rotors feature a signature "short slot" design. The slot improves brake system performance by wiping away the debris of used friction material that otherwise accumulates between the rotor and pad. This keeps fresh pad material exposed to the rotor surface and helps prevent pad glazing. The edges sweeping the pad slightly increase the effective coefficient of friction, or "bite", amplifying brake system response to pedal input. By providing an escape path for water, slotted rotors can also improve initial brake response under wet conditions.

Every Power Slot rotor is finished with a black e-coating on both sides of the hat, inside the cooling vanes and on the outside edge. E-coating is a superior electro-statically applied finish designed to withstand 400 hours of salt water exposure without rusting. This is especially important on both mounting faces of the hat where it touches the hub flange and back face of the wheel. Any accumulation of rust in these areas can lead to installed lateral runout issues.

Power Slot rotors feature a double disc ground, taper free finish. Double disc grinding ensures parallelism, eliminates run out and provides near perfect disc thickness variation (DTV). Double disc grinding leaves a non-directional finish on the friction surface area for more effective pad and rotor break-in. This special finish also provides quieter and smoother stops.

Power Slot rotors feature 100 percent fully machined finishes including rotor hats. This extra process provides better rotor balance and creates a cleaner, more finished looking component.

Power Slot brake rotors are mill balanced to a tolerance of less than 2 oz-inch. This additional machining operation reduces feedback associated with rotor vibration and provides a smooth, confident application of braking force.

Center-split core castings provide proper heat transfer and thermal efficiency, resulting in superior braking power and safety.

Power Alloy metallurgy is another unique feature in many of Power Slot's rotors. Quality and performance live inside the rotor too. Choosing the correct foundry partner and working to improve the metallurgy are all part of Power Slot's continuous improvement process that helps to reach established targets for hardness and tensile strength. Many of Power Slot's top-selling part numbers are cast using this Power Alloy iron specification, an enhancement in the carbon and molybdenum content of the iron. Carbon and molybdenum promote crack resistance and improve noise, vibration and harshness (NVH).

Shipping Notes
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Exchange/Return Notes
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  • Final sale items are not eligible for returns or exchanges.
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SKU: 56575517395

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4.2 ★★★★★
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AKO
Birmingham, US
★★★★★ 5
Comfortable Even After Long Hours
Color: Black, Number of Items: 1
I purchased this chair for my husband’s home office, and it has been a great choice. The height and angle can be adjusted very easily, making it comfortable to customize. Assembly was also simple and straightforward. The size is just right, and it remains comfortable even after sitting for long periods of time without causing fatigue. Overall, the quality exceeded my expectations for the price. If it ever breaks, I would definitely purchase the same one again.
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Reviewed in the United States on May 11, 2026
M
Verified Purchase
MrDerp
Dallas, US
★★★★★ 3
Not an average-to-large person's chair by any means.
Color: Brown, Number of Items: 1
PROS: Comfortable seat cushion Feels sturdy and manufactured well Swivels and rolls effortlessly Height adjustment Not terribly heavy Easy assembly CONS: Reclining feature is not great Back cushion forces a very upright sitting posture Pleather material will deteriorate within a couple years It's overpriced for what it is, even at $100. SUMMARY: I'm a little guy. 5'7 and 145 lbs. This chair feels like it was scaled for me and my little frame. Now, while that's perfect for me, nearly everyone else I know or have ever known, are at least twice my size. And I can't imagine them finding the overall size of this thing to be enough chair for them. Maybe I'm way off base here, but I've sat in regular sized office chairs and while they'd swallow me, they're essentially perfect sized for most other people. Feels good to sit in, nothing amazing but it's comfortable enough. Remember, it's made with pleather. Every day use for long periods of time will wear the material out within two or three years. Won't effect it's performance but it will be ugly with cracks and wear/tear far quicker than real leather, of course. It looks very nice right out the box though. Not too heavy either. The reclining feature is a bummer, it's like you really have to force it to lean back, like it's fighting against your doing so. Which if your trying to lean back, you know putting a bunch of effort into your legs is the opposite of what you're trying to achieve - which is relax without tension in any part of your body. It's basically useless for my needs, anyway. The price, even at a measly $100 for an "executive office chair" does not reflect the hiccups with this thing because it's not a one size fits all kind of chair. Anyone over 180 lbs and 5'10 will surely find it to be a bit snug and the back cushion to sit a bit short. The back forces you to sit very upright. Something that will take getting used to, especially since I can't recline. This chair is kinda "meh" to be completely honest. I'll spend at least twice as much next time and get five times the quality. Look, it'll do the job for a while but there really isn't anything very impressive about it besides what it visually looks like. I've no idea how so many people rated this thing with so many glowing reviews. There's not a lot to boast about with a cheap $100 pleather chair that's undersized for most people. I really don't get it. I'd only recommend this at $65-$70. No way this is worth the $100 Amazon is currently pricing it at. Spend just a little a bit more, you'll notice a huge jump in quality over this.
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Reviewed in the United States on August 15, 2024
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MrTruth
Houston, US
★★★★★ 3
Just Great!
Color: Beige, Number of Items: 1
Comfortable. Wheels roll very well. Great padding. Seems durable. Assembly is the standard with such chairs, takes about 15 minuttes. Do not know how long the PL? leather fabric will last? Probably wear in a couple of years. But for the price, this is perfect. UPDATE: After 2 1/2 months, seat feels flat and very uncomfortable.
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Reviewed in the United States on March 12, 2026
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VicYay
Lowell, US
★★★★★ 5
Modern and comfortable, easy to assemble
Color: White, Color: White
Reliable chair with solid quality. Assembly took about 35 mins following the clear instruction sheet. Chair can hold at least 220 lbs, stable and easy to move. Wheels can move in multiple directions. Seat heights and arm are both adjustable. No stain or scratches on the padding surface. White finish looks clean and modern.
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Reviewed in the United States on April 27, 2026
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boo h 1964
Bozeman, US
★★★★★ 5
Impressive Chair for the price!
Color: Black
Purchased for my mother, she absolutely loves it. She used a secretary style chair forever and said she didn't want a big bulky chair like the executive type until she saw this one. It's comfortable like an executive chair but not quite a big or cumbersome as the executive can be. It took a hot minute to put together but well worth it. Instructions were very clear and easy, I'm in my 60's, if I can put it together anybody can! Chair is well made, solid!
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Reviewed in the United States on May 8, 2026

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