FSA TH-870E ACB 45º Singles MR121 steering bearing, Grey

FSA TH-870E ACB 45º Singles MR121 steering bearing

8.49 €

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Specifications FSA TH-870E ACB 45º Singles MR121

Features of FSA TH-870E ACB 45º Singles MR121

Color Grey

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Grey

Product Type Bearings

Product Type

Bearings

Product description of FSA TH-870E ACB 45º Singles MR121 steering bearing

Description summary

Restore your bike´s flawless handling with the genuine FSA TH-870E ACB 45º MR121 headset bearing. Designed to eliminate play and gritty feedback, this part brings back that crisp, "like-new" steering feel. Its advanced Angular Contact Bearing (ACB) design handles both axial and radial loads, delivering exceptional stability and a longer lifespan than standard bearings. Ideal for the high-performance demands of both road and MTB, this precision-crafted steel bearing ensures a perfect fit for 1-1/8" headsets, providing smooth, reliable performance for a more confident ride

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FSA TH-870E ACB 45º MR121 Headset Bearing | Precision Steering Replacement

Restore the flawless, responsive handling of your bicycle with the genuine FSA TH-870E ACB 45º Singles MR121 steering bearing. Designed as a high-quality replacement part for your headset, this component is essential for any cyclist looking to eliminate headset play, gritty feedback, or notchy steering. Whether you´re a dedicated road cyclist demanding precision on fast descents or a mountain biker needing robust reliability on technical trails, this bearing delivers the performance and durability that the FSA brand is known for.

The core of this component´s superior performance lies in its Angular Contact Bearing (ACB) design. Unlike standard radial bearings that are only designed for loads in one direction, ACBs are meticulously engineered to handle both axial (vertical) and radial (side-to-side) loads simultaneously. This results in a significantly more stable and fluid steering experience, providing you with the confidence to push your limits. The bearing effectively distributes the forces from cornering, braking, and impacts, which not only improves handling but also drastically extends the service life of your headset by preventing premature wear.

Crafted with precision for a perfect fit, the FSA TH-870E is the ideal solution for servicing and upgrading compatible 1-1/8" headsets. Using a genuine FSA spare part ensures seamless integration and restores the original factory performance of your steering system. This bearing is built to withstand the elements, featuring a durable construction that resists corrosion from sweat, rain, and bike washing, ensuring long-lasting smoothness ride after ride. Don´t let a worn-out bearing compromise your bike´s performance and safety. Upgrading to a fresh FSA TH-870E will bring back that crisp, "like-new" feel to your handlebars, allowing for more intuitive control and a more enjoyable ride.

Key Features and Benefits:

* Enhanced Steering Precision: The Angular Contact Bearing (ACB) design provides exceptionally smooth, stable, and responsive steering control.
* Superior Durability: Engineered to handle combined axial and radial loads, offering a longer lifespan and greater resistance to wear compared to conventional bearings.
* Versatile Application: Perfectly suited for the high-performance demands of both ROAD and MTB disciplines, from high-speed cornering to rough-terrain impacts.
* Genuine FSA Quality: As an authentic FSA replacement part, it guarantees perfect compatibility and restores the original performance of your FSA headset.
* Reliable Performance: Revitalizes your steering system, eliminating play and friction for a safer and more enjoyable cycling experience.

Bearings Specifications:

* Type: Headset bearing
* Manufacturer: FSA
* Discipline: ROAD, MTB
* Material: Steel
* Weight (gr): 22
* Dimension: 1´´-1/8
* Bearing Type: ACB (Angular Contact Bearing)
* Angle: 45°x45°
* Model: TH-870E / MR121

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What our customers are saying about FSA TH-870E ACB 45º Singles MR121 steering bearing

This quality 1-1/8" upper headset bearing is an easy drop-in replacement for FSA headsets. It offers a perfect fit and smooth performance, effectively fixing steering slack for precise handling. With a high-quality material and finish, it´s a great upgrade for bikes like the Focus Cayo and Giant Revolt gravel bike, restoring a "like new" feel to your steering

High-quality bearing

2025/11/19

thierry

Good FSA-specific bearing. Perfect for a compatible headset. Mounted on a 2015 Specialized Camber mountain bike, it works very well. Lifespan depends on weather conditions and maintenance. My last bearing lasted 2 years. I would have preferred a stainless steel bearing, but I couldn't find an equivalent.

Photo does not correspond to the product

2025/11/10

Jose Antonio

Please note that the product photo does not match the title. The bearing is the one located at the top of the steering assembly on a Megamo Jakar.

Genial!

2025/08/24

David

Replacing the original bearing on my 2023 Cannondale Scalpel. Perfect!

Original spare part

2025/06/22

Juan Ramón

Original bearing to replace the old one in the Focus Cayo Disco steering.

Perfect replacement for my bike

2025/04/21

Alfonso

It fits perfectly on the top of my bike's steering wheel, it's a good price and the shipping is super fast.

FSA quality

2025/02/16

Alec

Replacing the 10 years old FSA headset bearing. Fit perfectly!

Replacement upper bearing for Giant's Overdrive headset (not OD2)

2021/01/18

Piripi

easy drop ,in replacement for the upper bearing on my giant revolt advanced 1 gravel bike.

Very good finish

2021/01/11

Egoi

Bearing material and very good finish, if you are looking for quality at a reasonable price, this is your product

FSA bearings

2020/12/24

Dean Barker

they fit, they work, happy steering.

Good bearing

2020/11/21

Juan

I have changed the steering bearings of my skinny as it had a little slack and now with these bearings it is great. They are worth it.

Perfect fit

2020/07/17

Nihar Kalolia

A very good and smooth bearing .

Good fit

2019/11/18

Oden

Nice replacement parts For FSA Headsets【Orbit CE42?】 Upper1-1/8 【single sided seald bearing】

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Steering bearings

2025/02/23

MARIO

Are there 2 bearings?

Answer of Alec

There is only one bearing per order.

Answer of CARLO

The bearing is single

photo of the bearing

2024/03/18

Pierre

hello I would like to buy the FSA bearing TH-870E ACB 45° Singles MR121 bearing but the photo corresponds to TH MR127 ACB 45°x36° Which one is it please best regards

Answer of JOEL

Hello, It is FSA TH-870E ACB 45° Singles MR121

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FSA TH-870E ACB 45º Singles MR121 steering bearing

Features of FSA TH-870E ACB 45º Singles MR121

FSA - Spare parts - Headsets

Specifications FSA TH-870E ACB 45º Singles MR121

Features of FSA TH-870E ACB 45º Singles MR121

Color Grey

Product Type Bearings

Product description of FSA TH-870E ACB 45º Singles MR121 steering bearing

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What our customers are saying about FSA TH-870E ACB 45º Singles MR121 steering bearing