Do the GiroDisc Front Rotors for E9X need any modifications to fit?

No. GiroDisc designed the Front Rotors for E9X as a direct replacement for the original 335i front discs. They bolt to the factory hubs, the stock calipers mount without spacers, and nothing is machined or trimmed. A competent home mechanic can fit them with ordinary hand tools in an afternoon.

Will my 335i keep its factory brake balance with these rotors?

Yes. The rotor keeps the original diameter and works with the BMW calipers, so the front to rear brake balance and the ABS tuning stay exactly as the factory set them. That is the main advantage over a big brake kit, which changes caliper and disc size together.

How does the floating design help on a track day?

The iron ring is allowed to expand with heat independently of the aluminum hat, so it stays flat instead of coning or warping. Ten drive pins transmit the braking load while spring washers hold everything quiet when cold. The result is a consistent pedal through a long session.

What happens when the iron rings wear out on an E9X?

GiroDisc sells D1-114 replacement rings for this rotor in pairs, with new hardware. The aluminum hats are kept and the fresh rings bolt on, so later brake service costs less than buying complete rotors. Replace the rings at the minimum thickness marked on the hat and ring edge, or if a crack reaches the edge.

Is it important which side each front rotor is installed on?

Yes. The curved vanes only pump air outward when they turn in the intended direction, so every GiroDisc rotor is made in a left and a right version and labeled for its corner. Fitting them on the wrong sides cuts cooling sharply, so check the labels before mounting the wheels.

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Description

GiroDisc Front Rotors for E9X BMW 335i

GiroDisc’s Front Rotors for E9X BMW 335i swap the heavy one-piece factory discs for a two-piece floating assembly built around a 6061-T6 aluminum hat. Ten cadmium-plated alloy steel drive pins carry the braking load into rings cast from GiroDisc’s own high-carbon iron, poured in the USA and machined in Bellingham, Washington. For a 335i owner who drives hard on mountain roads or the occasional track day, this is the way to add front heat capacity without changing calipers.

Bolt-On and Go

GiroDisc builds the E9X front rotor as a direct replacement for the original disc, so it bolts to the hub with no modifications and the factory calipers go straight back on. Keeping the stock diameter means the brake bias and ABS calibration BMW engineered stay intact. Curved internal vanes work as a centrifugal pump, drawing air in at the hub and throwing it out through the ring, which keeps temperatures in check lap after lap.

Features

Ten high-strength alloy steel drive pins, cadmium plated against corrosion
Hat machined from US-sourced 6061-T6 aircraft-specification aluminum
Ring cast from proprietary high-carbon iron, poured in the USA
Curved-vane cooling that pulls air from the hub outward
Class 12.9 cap screws with hardened washers
Anti-noise spring washers that stop cold rattle while allowing heat growth

What’s Included

Front rotor assemblies (L/R)

Applications

BMW 335i: E9X

Notes

The Front Rotors for E9X are left and right handed and labeled for position on the car
Worn rings are renewed with the GiroDisc E9X 335i front replacement rings, which bolt to these hats
The matching GiroDisc E9X 335i rear rotors complete a four-corner set
Cap screws may look loose because the ring floats; they are never tightened beyond 60 in-lb (7 Nm)
Stock photography may not depict the actual product

Frequently Asked Questions

Do the GiroDisc Front Rotors for E9X need any modifications to fit? No. GiroDisc designed the Front Rotors for E9X as a direct replacement for the original 335i front discs. They bolt to the factory hubs, the stock calipers mount without spacers, and nothing is machined or trimmed. A competent home mechanic can fit them with ordinary hand tools in an afternoon.
Will my 335i keep its factory brake balance with these rotors? Yes. The rotor keeps the original diameter and works with the BMW calipers, so the front to rear brake balance and the ABS tuning stay exactly as the factory set them. That is the main advantage over a big brake kit, which changes caliper and disc size together.
How does the floating design help on a track day? The iron ring is allowed to expand with heat independently of the aluminum hat, so it stays flat instead of coning or warping. Ten drive pins transmit the braking load while spring washers hold everything quiet when cold. The result is a consistent pedal through a long session.
What happens when the iron rings wear out on an E9X? GiroDisc sells D1-114 replacement rings for this rotor in pairs, with new hardware. The aluminum hats are kept and the fresh rings bolt on, so later brake service costs less than buying complete rotors. Replace the rings at the minimum thickness marked on the hat and ring edge, or if a crack reaches the edge.
Is it important which side each front rotor is installed on? Yes. The curved vanes only pump air outward when they turn in the intended direction, so every GiroDisc rotor is made in a left and a right version and labeled for its corner. Fitting them on the wrong sides cuts cooling sharply, so check the labels before mounting the wheels.

About GiroDisc

GiroDisc designs, manufactures, and sells 2-piece, fully floating brake rotors for a wide range of performance vehicles. Every major component, including the hats, rotor rings, and drive pins, is manufactured in-house at their facility in Bellingham, Washington, from domestically sourced materials. GiroDisc rotors use a proprietary high-carbon iron ring formulated for superior metallurgy and thermal performance, paired with reusable machined-aluminum hats that reduce the long-term cost of maintaining a high-performance brake system. The 2-piece floating design sheds unsprung and rotating mass while remaining street-friendly, delivering race-proven braking for track and street use alike.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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GiroDisc Front Rotors for E9X BMW 335i [A1-114]

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GiroDisc Front Rotors for E9X BMW 335i

Bolt-On and Go

Features

What’s Included

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews