SMALL END 16x20x23 BEARING, PROX 21.4504 MADE IN JAPAN
4.1 Trustpilot 99.9% positive on eBay
UK delivery £4.99, free over £60 2–4 business days
Spread the cost with 18+, T&Cs apply
Small end bearing 16x20x23 with 12 rollers. Manufactured by leading Japanese OEM factories to exact OEM specifications. Designed as a direct and cost efficient OEM replacement. Full line available from stock for Dirtbike, ATV, PWC and 50cc/scooter. Made in Japan. ProX 21.4504.
- SKU
- 56-6372.PROX
- Brand
- Pro-X Racing
- Availability
- In Stock (1)
Fitments (31)
| Make | Model | Year |
|---|---|---|
| KAWASAKI | JS (JS) 440 | 1976 |
| KAWASAKI | JS (JS) 440 | 1977 |
| KAWASAKI | JS (JS) 440 | 1978 |
| KAWASAKI | JS (JS) 440 | 1979 |
| KAWASAKI | JS (JS) 440 | 1980 |
| KAWASAKI | JS (JS) 440 | 1981 |
| KAWASAKI | JS (JS) 440 | 1982 |
| KAWASAKI | JS (JS) 440 | 1983 |
| KAWASAKI | JS (JS) 440 | 1984 |
| KAWASAKI | JS (JS) 440 | 1985 |
| KAWASAKI | JS (JS) 440 | 1986 |
| KAWASAKI | JS (JS) 440 | 1987 |
| KAWASAKI | JS (JS) 440 | 1988 |
| KAWASAKI | JS (JS) 440 | 1989 |
| KAWASAKI | JS (JS) 440 | 1990 |
| KAWASAKI | JS (JS) 440 | 1991 |
| KAWASAKI | JS (JS) 440 | 1992 |
| KAWASAKI | JS (JS) 550 | 1982 |
| KAWASAKI | JS (JS) 550 | 1983 |
| KAWASAKI | JS (JS) 550 | 1984 |
| KAWASAKI | JS (JS) 550 | 1985 |
| KAWASAKI | JS (JS) 550 | 1986 |
| KAWASAKI | JS (JS) 550 | 1987 |
| KAWASAKI | JS (JS) 550 | 1988 |
| KAWASAKI | SX JS 550 | 1989 |
| KAWASAKI | SX JS 550 | 1990 |
| KAWASAKI | SX JS 550 | 1991 |
| KAWASAKI | SX JS 550 | 1992 |
| KAWASAKI | SX JS 550 | 1993 |
| KAWASAKI | SX JS 550 | 1994 |
| KAWASAKI | SX JS 550 | 1995 |
- General Product Group
- Crankshafts & Parts
- General Product Type
- Small End Bearing
- Variant Id
- 251358
FULL DESCRIPTION
ProX Small End Bearing 16x20x23 - Precision Engineered in Japan
This ProX Small End Bearing, part number 21.4504, is a high-quality replacement component designed for piston pins. Manufactured by leading Japanese OEM factories, it offers a direct and cost-effective alternative to original equipment.
Engineered to meet exact OEM specifications, this bearing ensures a precise fit and reliable performance. It is an ideal choice for maintaining the integrity and functionality of your motorcycle, ATV, PWC, or scooter engine.
Key Features:
- Dimensions: 16mm (inner diameter) x 20mm (outer diameter) x 23mm (width).
- Construction: Features 12 durable rollers for smooth operation and reduced friction.
- Origin: Proudly made in Japan, ensuring superior quality and craftsmanship.
- Application: Suitable for a wide range of dirt bikes, ATVs, PWCs, and 50cc scooters.
- OEM Replacement: Designed as a direct, cost-efficient replacement for original piston pin bearings.
- Brand: Manufactured by ProX Racing, a trusted name in performance engine components.
QUESTIONS? JUST ASK
Talk to John or Phil. Real people, Monday to Friday, 10:00 to 17:00.
Check the fitment table on this page against your make, model and year. Not sure? Call or email us and we will check it for you before you order.
UK delivery is £4.99, or free on orders over £60. Orders ship within 3 working days, then delivery takes 2–4 business days. Delivery details
Yes. You have 14 days from delivery to return it, unused and in its original packaging. Contact us first and we will send you the return instructions. Returns policy
By card, PayPal, Apple Pay or Google Pay, or spread the cost with Klarna. Payment is taken securely by Stripe, and the options for your order are shown at checkout.
More answers in our FAQ.
Trade pricing available
Buying parts for your business? Apply for a 2BrosParts trade account.


