How much weight do the GiroDisc Front Rotors for Mercedes-Benz S55 save?

GiroDisc quotes about 23.6 lb for its Front Rotors for Mercedes-Benz S55 and CL55 AMG, against roughly 34.5 lb for the factory front rotor. That is close to 11 lb per corner, or nearly 22 lb across the front axle, all rotating and unsprung weight.

Will the factory AMG calipers be reused?

Yes. These rotors are a direct replacement for the original discs and need no modifications, so the factory calipers bolt straight back on. Because nothing about the caliper or diameter changes, the brake balance and ABS efficiency stay as the factory engineered them.

Does a lighter rotor make a noticeable difference on such a heavy car?

Yes. Removing rotating, unsprung mass helps the wheels follow the road and lets the car accelerate and respond with less effort. The two-piece floating design also resists heat distortion, which helps a heavy AMG stop consistently from high speed, time after time.

What happens when the iron rings wear out?

On a GiroDisc two-piece rotor the iron ring is the wear part, while the aluminum hat stays in service. Replace the rings at the minimum thickness marked on the hat and ring edge, or if a crack runs to the edge. Contact us for the matching part.

Do the front rotors have to go on a specific side?

Yes. The internal vanes curve in one direction so they pump air outward as the wheel turns forward. GiroDisc makes a left and a right rotor and labels each, so check the labels and fit each rotor on its marked side.

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Description

GiroDisc Front Rotors for Mercedes-Benz S55 AMG and CL55 AMG

GiroDisc’s Front Rotors for Mercedes-Benz S55 AMG and CL55 AMG take an unusually large bite out of front-end weight: GiroDisc measures its rotor at about 23.6 lb against roughly 34.5 lb for the factory part. That is close to 11 lb gone from each front corner of a heavy, powerful AMG. The two-piece design floats a ring of GiroDisc’s own US-cast iron on a 6061-T6 aluminum hat. For an owner who still drives a big AMG the way it was built to be driven, this is a meaningful brake upgrade that keeps the factory calipers.

Bolt-On and Go

The rotors are a direct replacement for the original front discs, so they bolt to the hubs and the factory AMG calipers go back on with no modifications. Brake bias and ABS efficiency stay as Mercedes-Benz set them. Curved internal vanes pump air outward through the ring, and spring washers on the drive pins keep the floating assembly quiet when cold.

Features

About 10.9 lb lighter per corner than the factory front rotor, by GiroDisc figures
US-sourced 6061-T6 aluminum hat
Proprietary cast iron ring poured in the USA
Curved vanes that pump air from hub to rim
Cadmium-plated alloy steel drive pins with anti-noise spring washers
Class 12.9 cap screws with hardened washers

What’s Included

Front rotor assemblies (L/R)

Applications

Mercedes-Benz CL55 AMG: Front axle
Mercedes-Benz S55 AMG: Front axle

Notes

The Front Rotors for Mercedes-Benz S55 and CL55 are handed and labeled for each side
The GiroDisc S55 and CL55 rear rotors are the matching rear set
Cap screws are never tightened beyond 60 in-lb (7 Nm)
Stock photography may not depict the actual product

Frequently Asked Questions

How much weight do the GiroDisc Front Rotors for Mercedes-Benz S55 save? GiroDisc quotes about 23.6 lb for its Front Rotors for Mercedes-Benz S55 and CL55 AMG, against roughly 34.5 lb for the factory front rotor. That is close to 11 lb per corner, or nearly 22 lb across the front axle, all rotating and unsprung weight.
Will the factory AMG calipers be reused? Yes. These rotors are a direct replacement for the original discs and need no modifications, so the factory calipers bolt straight back on. Because nothing about the caliper or diameter changes, the brake balance and ABS efficiency stay as the factory engineered them.
Does a lighter rotor make a noticeable difference on such a heavy car? Yes. Removing rotating, unsprung mass helps the wheels follow the road and lets the car accelerate and respond with less effort. The two-piece floating design also resists heat distortion, which helps a heavy AMG stop consistently from high speed, time after time.
What happens when the iron rings wear out? On a GiroDisc two-piece rotor the iron ring is the wear part, while the aluminum hat stays in service. Replace the rings at the minimum thickness marked on the hat and ring edge, or if a crack runs to the edge. Contact us for the matching part.
Do the front rotors have to go on a specific side? Yes. The internal vanes curve in one direction so they pump air outward as the wheel turns forward. GiroDisc makes a left and a right rotor and labels each, so check the labels and fit each rotor on its marked side.

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 Mercedes-Benz S55 AMG and CL55 AMG [A1-072]

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GiroDisc Front Rotors for Mercedes-Benz S55 AMG and CL55 AMG

Bolt-On and Go

Features

What’s Included

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews