How much power will the TR1A hold?

OS Giken USA rates the TR1A Clutch for Alfa 1750 Hydraulic 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.

Can the TR1A Clutch for Alfa 1750 Hydraulic be rebuilt?

Yes. OS Giken USA sells Overhaul Kit A (AR111-AF1EA) and Overhaul Kit B (AR111-AF1EB) for this clutch, with Kit B adding a new cover. Our team can order either kit when the clutch needs service, so it can be refreshed rather than replaced, and will confirm the contents for your car.

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Description

OS Giken TR1A Clutch for Alfa 1750 Hydraulic Alfa Romeo, Single Plate

OS Giken’s TR1A Clutch for Alfa 1750 Hydraulic 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 Alfa 1750 Hydraulic cars is one of several OS Giken clutches listed for the Alfa Romeo 1600 1750 twin cam with hydraulic release. The TR2A (about 350 lb-ft) covers other points in the range, so the choice comes down to power, pedal feel and how the car is used.

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
Rebuildable with OS Giken overhaul kits

Applications

Alfa Romeo 105 Series: 1600 / 1750 GTV and Spider | 1.6L / 1.8L twin cam, hydraulic release

Notes

OS Giken rebuild parts for this clutch are Overhaul Kit A (AR111-AF1EA) and Overhaul Kit B (AR111-AF1EB)
Installation labor is not included

Frequently Asked Questions

How much power will the TR1A hold? OS Giken USA rates the TR1A Clutch for Alfa 1750 Hydraulic 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 Alfa Romeo 1600 1750 twin cam with hydraulic release 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.
Can the TR1A Clutch for Alfa 1750 Hydraulic be rebuilt? Yes. OS Giken USA sells Overhaul Kit A (AR111-AF1EA) and Overhaul Kit B (AR111-AF1EB) for this clutch, with Kit B adding a new cover. Our team can order either kit when the clutch needs service, so it can be refreshed rather than replaced, and will confirm the contents for your car.

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

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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 Alfa 1750 Hydraulic Alfa Romeo, Single Plate [AR111-AF1]

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OS Giken TR1A Clutch for Alfa 1750 Hydraulic Alfa Romeo, Single Plate

Where It Sits in the Range

Features

Applications

Notes

Frequently Asked Questions

About OS Giken

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