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Details
| Specification | Value |
|---|---|
| Brand | OPTIMAL |
| Category | Wheel Bearing Set |
| Width [mm] | 18.3 mm |
| Width 1 [mm] | 17.5 mm |
| Width 2 [mm] | 18 mm |
| Outer Diameter 1 [mm] | 50 mm |
| Outer Diameter 2 [mm] | 65.1 mm |
| Inner Diameter 1 [mm] | 21.4 mm |
| Inner Diameter 2 [mm] | 34.9 mm |
OE/OEM numbers (2)
Search by this OE number to find compatible parts
- MERCEDES-BENZ—1263300051
- MERCEDES-BENZ—A1263300051
Where this part fits
Original-fit position for OE 1263300051. The red ring marks where this part installs on the vehicle.
About this product
Sourced from OPTIMAL, this wheel bearing set (401126) combines precision engineering with durable materials to meet the demands of everyday driving and extended service intervals. Technical specifications — Width [mm]: Composite, Cast Iron mm, Width 1 [mm]: Fibreglass, Rubber mm, Width 2 [mm]: Composite mm, Outer Diameter 1 [mm]: 50 mm, Outer Diameter 2 [mm]: 65, Steel mm — are verified against the OEM data sheet to guarantee fitment accuracy and performance parity with the original equipment. Verified to fit MERCEDES-BENZ models. All compatibility data is cross-checked against the TecDoc database — select your vehicle to confirm the part matches your specific engine and year. This part supersedes original equipment references: 014 033 0042, 02.31.118, 050262B, 05580 and 45 more. Matching these numbers confirms a like-for-like replacement with no loss of function. OPTIMAL is a recognised supplier of automotive replacement components to independent workshops and dealer networks across Europe. All parts are sourced from authorised distribution channels and carry full manufacturer traceability — you receive exactly the same component supplied to professional garages and dealer workshops. If fitment or specifications do not match your vehicle, our technical team can help identify the correct alternative — use the vehicle selector or contact us with your VIN for a guaranteed-fit recommendation. Replacing worn components on schedule preserves your vehicle's safety, reliability, and resale value — and aftermarket parts from established brands deliver OEM-equivalent performance at a fraction of the dealer price. Every part is dispatched from our UK warehouse with a 30-day money-back guarantee and free hassle-free returns.
About OPTIMAL
OPTIMAL, founded in Germany, is a well-regarded aftermarket brand specialising in steering, suspension, and wheel bearing components. OPTIMAL produces ball joints, tie rod ends, control arm bushings, wheel bearings, and stabiliser links for European, Asian, and American vehicle applications. Manufactured to stringent quality standards with comprehensive testing protocols, OPTIMAL parts deliver OE-matching fit and performance. Known for excellent value and wide vehicle coverage, OPTIMAL is a popular choice among professional workshops across Europe.
Suitable cars
Equivalent products (50)
Show all 50 OE numbers
Wheel Bearing Set OPTIMAL 401126 — compatible car models
| Car models | MERCEDES-BENZ: 123 Coupe (C123), 123 Saloon (W123), 123 T-Model (S123), S-CLASS Coupe (C126), S-CLASS (W126) |
|---|---|
| Engines | 230 C (123.043); 200; 200 T; 380 SEC (126.043); 260 SE (126.020) |
| Year of manufacture | 1976-1991 |
| Manufacturer article number (MPN) | 401126 |
| OE part numbers | 1263300051, A1263300051 |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
OPTIMAL 401126 Wheel Bearing Set. Inner Diameter 1 [mm]: 21,4 mm. Inner Diameter 2 [mm]: 34,9 mm. Outer Diameter 1 [mm]: 50 mm. Outer Diameter 2 [mm]: 65,1 mm. Width 1 [mm]: 17,5 mm. Width 2 [mm]: 18 mm. Width [mm]: 18,3 mm
- 1x Wheel Bearing Set
Shipping, returns, warranty
Free UK delivery on orders over £99.00. Express and standard shipping available.
- Standard delivery: 2-5 business days
- Express delivery: 1-2 business days
- Free returns within 14 days
- All parts backed by manufacturer warranty
Warranty: 12-month manufacturer warranty on all parts. 14-day money-back guarantee if the part doesn't fit your vehicle.
Frequently Asked Questions
Is this Wheel Bearing Set compatible with my car?
This Wheel Bearing Set fits MERCEDES-BENZ vehicles. Use the vehicle selector at the top of the page to check exact compatibility — enter your car's make, model, and engine for a confirmed fitment match. All fitment data is verified through TecDoc.
What specifications does this OPTIMAL Wheel Bearing Set have?
This OPTIMAL Wheel Bearing Set has the following specifications: Width [mm]: 18,3 mm; Width 1 [mm]: 17,5 mm; Width 2 [mm]: 18 mm; Outer Diameter 1 [mm]: 50 mm; Outer Diameter 2 [mm]: 65,1 mm; Inner Diameter 1 [mm]: 21,4 mm. Check the full specifications table above for complete details.
What OE part numbers does this Wheel Bearing Set replace?
This Wheel Bearing Set replaces OE part numbers: 1263300051, A1263300051. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a Wheel Bearing Set cost?
This OPTIMAL Wheel Bearing Set is available for £20.99. Wheel Bearing Set prices vary depending on brand, specifications, and vehicle compatibility. OPTIMAL parts offer a balance of quality and value, backed by our 14-day money-back guarantee.
How do I know when to replace my Wheel Bearing Set?
Listen for humming, growling, or grinding noises that change with vehicle speed, or notice play in the wheel when jacked up.
What tools do I need to replace a Wheel Bearing Set?
Tools needed: floor jack, axle stands, hub puller, bearing press or large socket and vice (for pressing), hub nut socket (typically 30-36mm), new hub nut, torque wrench, circlip pliers. Difficulty: Professional recommended. Safety warning: A failed wheel bearing can lead to wheel detachment. On driven axles the hub nut must be torqued to specification (often 200-300 Nm) -- under-torquing is a serious safety risk.
Can I use this part as a replacement for OE 1263300051?
Yes, this OPTIMAL Wheel Bearing Set is a direct replacement for OE part number 1263300051. It is manufactured to meet or exceed original equipment specifications, ensuring proper fitment and performance. All cross-reference data is verified through TecDoc.
Related categories
Common OE numbers for this part
Common original equipment numbers linked to stocked alternatives.
