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Hybrid, Steel, Ceramic Bearings | Aire Velo Bearings

The MR18338 (18x33x8 mm) is a high-precision, deep-groove cartridge bearing designed for bicycle hubs and Bosch e-bike motor systems. It typically features Chromium Molybdenum (CrMo) steel races, ABEC-3 tolerance, and 2RS double-seals, offering high load resistance and protection against dirt, moisture, and wear.

Key Specifications & Features

Dimensions:
Designation: MR18338, MR18338-2RS, CB-137 (Marwi/Union)
Material: Chrome Steel / CrMo (Chromium Molybdenum)
Sealing: 2RS (Double-sealed, rubber)
ABEC Rating: Typically ABEC-3
Lubrication: Multemp SRL (Kyodo Yushi) Grease
Application: Ideal for Bosch e-bike motors (Gen 1) and high-performance hubs

Benefits

High Performance: Provides low-friction, high-precision performance for enhanced bike operation.
Durability: Hardened steel construction provides high resistance to wear, often matching or exceeding OEM specifications.
Protection: The 2RS seal design prevents contaminants from entering and damaging the bearing.

Common Manufacturers/Brands

M-Part
Marwi/Union
Generic/OEM suppliers

These bearings are often referred to as direct replacements for older Bosch e-bike system motors and various hub applications.

Bearing Marwi MR18338 2RS - Vélo-Store
Marwi Bearing MR18338 2RS * Nom Product : Bearing. * Product model : Cb-137. * Outside diameter: 33 Mm. * Inside diameter: 18 Mm. ...
velo-store.shop
M Part MPart MR18338 18x33x8 Bosch Cartridge Bearing
Constructed with a steel retainer and Chromium Molybdenum (CrMo) races and ball bearings, the cartridge bearing MR18338 also boast...
JE James Cycles
M Part Cartridge Bearing MR18338 18x33x8 Bosch - Little Sport Bikes
Apr 8, 2026 — M Part Cartridge Bearing MR18338 18x33x8 Bosch. €0.00. Colour: Silver. CB-137. 5027726773969. The Cartridge Bearing MR18338 18x33x...
Little Sport Bikes

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Web results

CARTRIDGE BEARING MR18338 18x33x8 Bosch

Scuff Wheels

https://scuffwheels.com › products

Scuff Wheels

https://scuffwheels.com › products

CARTRIDGE BEARING MR18338 18x33x8 Bosch. Sale. Regular price £9.99. Tax included.Read more

£9.9914-day returns

Cartridge Bearing MR18338 18x33x8 Bosch (UK IMPORT) ...

eBay

https://www.ebay.com › ... › Every Other Thing

eBay

https://www.ebay.com › ... › Every Other Thing

Cartridge Bearing MR18338 18x33x8 Bosch (UK IMPORT) CYCLING AC NEW ; Est. delivery. Thu, Apr 30 - Mon, May 4. From Rushden, United Kingdom ; Returns. Accepted ...

OEM/ODM High Speed MR18338 Bicycle Hub Bearing with Z/RS ...

rmbearing.com

https://www.rmbearing.com › Bicycle Bearing

rmbearing.com

https://www.rmbearing.com › Bicycle Bearing

The MR18338 Z / RS deep groove ball bearing is a lightweight, low‑friction, and high‑precision bearing widely used in high‑performance bicycle wheelsets, hubs, ...

Bicycle Bearing 18338 MR18338 Deep groove Ball ...

Alibaba.com

https://www.alibaba.com › product-detail › Bicycle-Bea...

Alibaba.com

https://www.alibaba.com › product-detail › Bicycle-Bea...

Product name:Deep Grove Ball Bearing;Material:Chrome Steel/GCr15 Stainless Steel;Feature:Long Life High Speed;Application:Bicycle;Model:18338 MR18338 ...

M Part MPart MR18338 18x33x8 Bosch Cartridge Bearing

JE James Cycles

https://www.jejamescycles.com › product › option

JE James Cycles

https://www.jejamescycles.com › product › option

Constructed with a steel retainer and Chromium Molybdenum (CrMo) races and ball bearings, the cartridge bearing MR18338 also boasts an impressive hardness ...Read more

£9.99In stock3–7 day delivery365-day returns

Bearing Marwi MR18338 2RS - Vélo-Store

velo-store.shop

https://velo-store.shop › 207583-bearing-marwi-mr183...

velo-store.shop

https://velo-store.shop › 207583-bearing-marwi-mr183...

Marwi Bearing MR18338 2RS. $12.98 $10.83 -17%. Optimize your cycling performance with the high-quality Marwi MR18338 2RS Bearing, designed by the renowned Marwi ...Read more

MR-18338-2RS - Bearings

World Bearing

https://world-bearing.com › ... › Special sizes

World Bearing

https://world-bearing.com › ... › Special sizes

Data sheet. Inner: 18; Outer diameter: 33; Inner Ring Width: 8; Observaciones: ACERO CROMO. Here you can add custom original content(text, images, ...Read more

€18.69

Union CB-137 MR18338 18x33x8 Bosch GEN 1

Tinoxin

https://www.tinoxin.fi › Bearing-F6801-2RS-flanged-12...

Tinoxin

https://www.tinoxin.fi › Bearing-F6801-2RS-flanged-12...

Union CB-137 MR18338 18x33x8 Bosch GEN 1. 14.95 € 9.95 € * You save 33 %. In stock: 2 pcs, delivery time 1-3 days. Delivery weight:Read more

€9.95

Union CB-137 Ball Bearing MR18338 18x33x8 For. Bosch

Hollandbikeshop.com

https://hollandbikeshop.com › individual-ball-bearings

Hollandbikeshop.com

https://hollandbikeshop.com › individual-ball-bearings

A ball bearing is a high-quality mechanical component that uses balls in a ring-shaped cage to minimize friction and enable effortless rotation - the ideal ...

£7.23