How much weight do the GiroDisc Rear Rotors for C7 remove?

GiroDisc lists the Rear Rotors for C7 at 16.6 lb per assembly, compared with 24.7 lb for the factory rear disc. That is about 8.1 lb per corner, or more than 16 lb across the axle, all of it rotating and unsprung mass.

Do the C7 rear rotors bolt on without modification?

Yes. GiroDisc builds them as a direct replacement for the original rear discs, so they mount to the hub and accept the factory rear calipers as delivered. Rotor size is unchanged, which leaves the brake balance and ABS calibration of the Z06 or Grand Sport untouched.

What part number replaces the C7 rear rings?

GiroDisc part D2-147 is the matching rear ring set. It is sold as a pair with new hardware and bolts to the aluminum hats you already own. Rings are replaced at the minimum thickness marked on the hat and ring edge, or if a crack reaches the ring edge.

Why does a floating rear rotor stay truer than a one piece disc?

The iron ring is free to expand on its drive pins instead of pulling against a solid center, which limits distortion when it gets hot. The aluminum hat also holds less heat near the hub, and the curved vanes move air outward through the disc as it spins.

Are the left and right C7 rear rotors interchangeable?

No. The curved vanes are directional and only pump air outward when the rotor turns the right way, so GiroDisc marks each one for its corner. Fitting them on the wrong sides cuts cooling, so check the labels before the wheels go back on.

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Description

GiroDisc Rear Rotors for C7 Chevrolet Corvette Z06 and Grand Sport

GiroDisc’s Rear Rotors for C7 Corvette Z06 and Grand Sport cars make the bigger weight cut of the pair: GiroDisc measures 16.6 lb per assembly against 24.7 lb for the factory rear disc, roughly 8.1 lb gone from each rear corner. That is rotating and unsprung mass the suspension no longer has to control over curbs and bumps. The two-piece build bolts straight on and keeps the factory rear calipers, which makes it a sensible first brake upgrade for a C7 already on good tires.

Design and Performance

A 6061-T6 aluminum hat carries a ring of GiroDisc’s proprietary iron on ten cadmium-plated alloy steel drive pins. The ring floats axially and radially, so it can expand under heat instead of coning, while spring washers stop the cold rattle common to floating discs. Curved internal vanes draw air from the hub and push it out through the rim.

Features

About 8.1 lb lighter per corner than the factory rear rotor, by GiroDisc measurement
Ten drive pins made by GiroDisc, secured by class 12.9 cap screws with hardened washers
Curved vane ring that works as a centrifugal air pump
Slotted face that clears debris and water from the friction surface
Bolts on in place of the original discs with the factory calipers retained
Labeled left and right for correct vane direction

What’s Included

Rear rotor assemblies (L/R)

Applications

Chevrolet Corvette Grand Sport: C7 | 6.2L LT1 V8
Chevrolet Corvette Z06: C7 | 6.2L LT4 supercharged V8

Notes

The GiroDisc Rear Rotors for C7 fit the Z06 and Grand Sport as GiroDisc lists them
Replacement iron comes as the GiroDisc C7 rear replacement rings, which reuse these hats
Pair them with the GiroDisc C7 front rotors for matching hardware at both axles
Bed the rotors in before the first track session, as GiroDisc recommends for all new discs
Stock photography may not depict the actual product

Frequently Asked Questions

How much weight do the GiroDisc Rear Rotors for C7 remove? GiroDisc lists the Rear Rotors for C7 at 16.6 lb per assembly, compared with 24.7 lb for the factory rear disc. That is about 8.1 lb per corner, or more than 16 lb across the axle, all of it rotating and unsprung mass.
Do the C7 rear rotors bolt on without modification? Yes. GiroDisc builds them as a direct replacement for the original rear discs, so they mount to the hub and accept the factory rear calipers as delivered. Rotor size is unchanged, which leaves the brake balance and ABS calibration of the Z06 or Grand Sport untouched.
What part number replaces the C7 rear rings? GiroDisc part D2-147 is the matching rear ring set. It is sold as a pair with new hardware and bolts to the aluminum hats you already own. Rings are replaced at the minimum thickness marked on the hat and ring edge, or if a crack reaches the ring edge.
Why does a floating rear rotor stay truer than a one piece disc? The iron ring is free to expand on its drive pins instead of pulling against a solid center, which limits distortion when it gets hot. The aluminum hat also holds less heat near the hub, and the curved vanes move air outward through the disc as it spins.
Are the left and right C7 rear rotors interchangeable? No. The curved vanes are directional and only pump air outward when the rotor turns the right way, so GiroDisc marks each one for its corner. Fitting them on the wrong sides cuts cooling, so check the labels before the wheels go back on.

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 Rear Rotors for C7 Chevrolet Corvette Z06 and Grand Sport [A2-147]

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GiroDisc Rear Rotors for C7 Chevrolet Corvette Z06 and Grand Sport

Design and Performance

Features

What’s Included

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews