ECS Tuning 2-Piece Lightweight Rear Brake Rotors (Pair) 336x22mm - Direct Bolt-On, Cross-Drilled & Slotted, Semi-Floating - Fits BMW E9x (E90/E92/E93 335i 335d 330i) and E84 X1 xDrive35i

BMW E9x Rear Performance Brake Discs by ECS Tuning - Two Piece 336 x 22 mm - Pair

Transform the way your BMW stops with ECS Tuning’s two piece rear brake discs. Lighter, cooler running and engineered for fast road and track day use, these rear rotors deliver sharper pedal feel and confident, repeatable braking. By cutting unsprung weight and rotational inertia by roughly 3 lb per disc, you get crisper turn-in, improved ride control and stronger deceleration without compromising daily drivability.

Why enthusiasts choose this upgrade

• Direct fit for OEM calipers and pads - no modifications, no drama
• Significant weight saving per disc for faster response and better handling
• Semi floating hat and ring construction to help manage heat growth and reduce the risk of distortion
• Drilled and grooved faces to sweep the pad, clear gas and water, and aid cooling
• Heat treated grey cast iron rings for stable friction and dependable fade resistance
• 6061 aluminium bell, hard anodised matte black for strength and corrosion protection
• Chamfered drilling and ball end milled slots to help mitigate cracking seen on inferior products
• Painted non-friction areas and internal vents for added protection against salt and grime
• Precision ground braking surfaces for parallelism and smooth, consistent bedding
• Supplied with stainless rotor set screws to replace rusty factory hardware

Technical details

• Position: rear axle
• Configuration: two piece, semi floating, drilled and slotted
• Dimensions: 336 mm x 22 mm
• Approximate weight: 15.5 lb per disc vs about 18.5 lb stock (around 7.0 kg vs 8.4 kg - about 1.36 kg saving per side)
• Sold as a matched pair

Real results you can feel

We have run these discs ourselves and the feedback from our customers mirrors our experience - stronger bite, better high-speed confidence and reduced fade on spirited drives. The bell and ring design helps shed heat quickly, while the lighter assembly gives your suspension less work to do for a more composed rear end.

Compatible BMW models

For platforms using 336 x 22 mm rear discs:

• E84 X1 xDrive35i - N55 3.0L
• E90 330i - N52 3.0L
• E90 330xi - N52 3.0L
• E90 335d - M57 3.0L
• E90 335i - N54 3.0L
• E90 335i - N55 3.0L
• E90 335xi - N54 3.0L
• E90 335xi - N55 3.0L
• E92 335i - N54 3.0L
• E92 335i - N55 3.0L
• E92 335is - N54 3.0L
• E92 335xi - N54 3.0L
• E92 335xi - N55 3.0L
• E93 335i - N54 3.0L
• E93 335i - N55 3.0L
• E93 335is - N54 3.0L

Installation

Want a hassle free, professional fitment with proper bedding-in guidance? Book your install with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Notes

• Future friendly: replacement rings are available. Original owners may be eligible for discounted ring pairs with proof of purchase. Contact us for advice.

Search terms customers use

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