How much power will the TR1A hold?

OS Giken USA rates the TR1A Clutch for NA NB Miata at about 250 lb-ft of torque, and OS Giken Japan places the TR range in its 600 PS class. For more power than that, a higher capacity OS Giken series is the better match.

It is the OS Giken model code. TR is the cover series, 1 means a single disc and A is the 184mm disc size. There is no D, so the disc has a solid hub for direct engagement. The same code system runs across the whole OS Giken clutch range.

Is the TR1A easy to drive on the street?

The billet aluminum cover gives a more direct pedal, and OS Giken shaped the diaphragm spring to reduce overall pedal effort. Expect firmer engagement than a factory clutch, but it remains usable on the street. The aluminum cover also allows a higher clamping force for track use.

Which cars does the TR1A Clutch for NA NB Miata fit?

The TR1A Clutch for NA NB Miata is listed for the Mazda Miata / MX-5 NA (1990-1997) and Mazda Miata / MX-5 NB (1999-2005). Our team will confirm the part number against your chassis and gearbox before the order is placed, so the clutch arrives ready to fit.

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Description

OS Giken TR1A Clutch for NA NB Miata Mazda MX-5, Single Plate

OS Giken’s TR1A Clutch for NA NB Miata models is the single plate clutch from OS Giken’s TR series, built around a single 184mm disc with a solid hub and a billet aluminum cover for a more direct pedal and a higher clamping force. OS Giken USA rates it at about 250 lb-ft, and OS Giken designed the TR1A with naturally aspirated engines in mind. OS Giken USA describes the TR series as built for engines with substantial increases in power, with a diaphragm spring shaped to reduce overall pedal effort. OS Giken USA notes that this is typically the lightest clutch and flywheel assembly for most applications.

Where It Sits in the Range

The TR1A Clutch for NA NB Miata cars is one of several OS Giken clutches listed for the NA and NB Miata. The TS2BS (about 500 lb-ft), TS2B (about 500 lb-ft) and TS2A (about 350 lb-ft) cover other points in the range, so the choice comes down to power, pedal feel and how the car is used.

How It Is Listed

OS Giken USA and Turn 14 list the TR1A for the NA and NB Miata. The OS Giken Japan Roadster table does not show the TR1A, so our team will confirm fitment and release parts with OS Giken before the order is placed.

Features

A single 184mm disc with a solid hub
Billet aluminum TR cover for a higher clamping force
Rated by OS Giken USA at about 250 lb-ft
Designed with naturally aspirated engines in mind
Built by OS Giken to be serviced and rebuilt

Applications

Mazda Miata / MX-5: NA | 1990-1997 | 1.6L B6 / 1.8L BP
Mazda Miata / MX-5: NB | 1999-2005 | 1.8L BP

Notes

Installation labor is not included

Frequently Asked Questions

How much power will the TR1A hold? OS Giken USA rates the TR1A Clutch for NA NB Miata at about 250 lb-ft of torque, and OS Giken Japan places the TR range in its 600 PS class. For more power than that, a higher capacity OS Giken series is the better match.
Who is the TR1A made for? OS Giken designed the TR1A with naturally aspirated engines in mind. OS Giken USA describes the TR series as built for engines with substantial increases in power, with a diaphragm spring shaped to reduce overall pedal effort. On the NA and NB Miata it suits owners who want more clamping force for a heavily modified engine.
What does TR1A mean? It is the OS Giken model code. TR is the cover series, 1 means a single disc and A is the 184mm disc size. There is no D, so the disc has a solid hub for direct engagement. The same code system runs across the whole OS Giken clutch range.
Is the TR1A easy to drive on the street? The billet aluminum cover gives a more direct pedal, and OS Giken shaped the diaphragm spring to reduce overall pedal effort. Expect firmer engagement than a factory clutch, but it remains usable on the street. The aluminum cover also allows a higher clamping force for track use.
Which cars does the TR1A Clutch for NA NB Miata fit? The TR1A Clutch for NA NB Miata is listed for the Mazda Miata / MX-5 NA (1990-1997) and Mazda Miata / MX-5 NB (1999-2005). Our team will confirm the part number against your chassis and gearbox before the order is placed, so the clutch arrives ready to fit.

About OS Giken

OS Giken was founded in Okayama, Japan in 1973 by Masaharu Okazaki. It built the TC16 and TC24-B1 DOHC cylinder heads for Nissan L-series engines, began making multi-plate racing clutches in 1982 and started supplying OEM limited-slip differentials in 1983. Development of the Super Lock LSD began in 1997, and of the OS-88 sequential gearbox for the Skyline GT-R in 1998.

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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OS Giken TR1A Clutch for NA NB Miata Mazda MX-5, Single Plate [MZ061-AF1]

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OS Giken TR1A Clutch for NA NB Miata Mazda MX-5, Single Plate

Where It Sits in the Range

How It Is Listed

Features

Applications

Notes

Frequently Asked Questions

About OS Giken

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