Which hats accept the GiroDisc MSO 390mm Rear Replacement Rings?

The MSO 390mm Rear Replacement Rings bolt to the aluminum hats of the GiroDisc A2-206 rear rotors for the McLaren 765LT and 750S with the MSO track brake package. They are not compatible with factory carbon-ceramic rotors, factory two-piece hats or other brands.

When do the 765LT rear rings need replacing?

GiroDisc recommends a new pair once the rings wear from 34mm down to 32mm, or as soon as a crack reaches the outer edge. Checking thickness at every track day service makes it easy to order rings before they are needed.

Are drive pins and screws reused during a ring change?

GiroDisc supplies new mounting hardware with every pair, so the old fasteners are retired with the worn rings. Only the aluminum hats carry over. Keep cap screw torque at or below 60 in-lb so the rings keep their float on the hats.

Does a ring swap change how the brakes feel?

No. The new rings match the 390mm diameter, 34mm thickness and vane design of the originals on the A2-206 rotors, so the brake feel and balance return to where they were with the first set. Bed the new rings in before pushing hard.

Why buy rings instead of complete rear rotors?

The aluminum hats do not wear in normal use, so replacing only the iron avoids paying for new hats at every service. On a car that sees regular track sessions, that difference adds up quickly over a season of driving.

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Description

GiroDisc MSO 390mm Rear Replacement Rings for McLaren 765LT and 750S

GiroDisc’s MSO 390mm Rear Replacement Rings for the McLaren 765LT and 750S renew the iron on the A2-206 rear rotors fitted to cars with the upgraded MSO track brake package. Each ring is 34mm thick when new and carries 72 curved vanes, cast from GiroDisc’s high-carbon iron and machined in Bellingham, Washington. They are sold in pairs with new hardware. The black-anodized hats stay on the car, so a rear brake refresh costs a fraction of new rotors.

Fitment and Installation

The rings bolt to the existing GiroDisc A2-206 hats with the supplied hardware. They are designed for GiroDisc hats only and will not mount to factory carbon-ceramic assemblies, factory two-piece hats or other brands. Each ring is handed so its vanes pump air outward, and the cap screws stay at or under 60 in-lb (7 Nm).

Features

390mm outer diameter for the MSO track brake rear rotor
34mm new thickness, 32mm service limit
72 curved vanes for strong airflow
Proprietary high-carbon iron cast in the USA
New mounting hardware supplied with each pair

Specifications

Outer diameter: 390mm
New thickness: 34mm
Minimum thickness: 32mm
Vane count: 72 curved
Fits hats from: GiroDisc A2-206

What’s Included

Rear replacement rings (L/R)
Replacement mounting hardware

Applications

McLaren 750S: MSO track brake package with GiroDisc A2-206 rear rotors
McLaren 765LT: MSO track brake package with GiroDisc A2-206 rear rotors

Notes

The MSO 390mm Rear Replacement Rings fit only the hats of the GiroDisc 390mm rear rotors for the McLaren 765LT and 750S
Hats are not included; the existing GiroDisc hats are reused
Replace the rings at 32mm or if a crack reaches the edge
Stock photography may not depict the actual product

Frequently Asked Questions

Which hats accept the GiroDisc MSO 390mm Rear Replacement Rings? The MSO 390mm Rear Replacement Rings bolt to the aluminum hats of the GiroDisc A2-206 rear rotors for the McLaren 765LT and 750S with the MSO track brake package. They are not compatible with factory carbon-ceramic rotors, factory two-piece hats or other brands.
When do the 765LT rear rings need replacing? GiroDisc recommends a new pair once the rings wear from 34mm down to 32mm, or as soon as a crack reaches the outer edge. Checking thickness at every track day service makes it easy to order rings before they are needed.
Are drive pins and screws reused during a ring change? GiroDisc supplies new mounting hardware with every pair, so the old fasteners are retired with the worn rings. Only the aluminum hats carry over. Keep cap screw torque at or below 60 in-lb so the rings keep their float on the hats.
Does a ring swap change how the brakes feel? No. The new rings match the 390mm diameter, 34mm thickness and vane design of the originals on the A2-206 rotors, so the brake feel and balance return to where they were with the first set. Bed the new rings in before pushing hard.
Why buy rings instead of complete rear rotors? The aluminum hats do not wear in normal use, so replacing only the iron avoids paying for new hats at every service. On a car that sees regular track sessions, that difference adds up quickly over a season of driving.

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 MSO 390mm Rear Replacement Rings for McLaren 765LT and 750S [D2-206]

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GiroDisc MSO 390mm Rear Replacement Rings for McLaren 765LT and 750S

Fitment and Installation

Features

Specifications

What’s Included

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews