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Details
| Specification | Value |
|---|---|
| Brand | OPTIMAL |
| Category | Wheel Bearing Set |
| Width [mm] | 18 mm |
| Inner Diameter [mm] | 46 mm |
| Outer Diameter [mm] | 75 mm |
| Width 1 [mm] | 21.5 mm |
| Outer Diameter 1 [mm] | 82 mm |
| Inner Diameter 1 [mm] | 50 mm |
OE/OEM numbers (4)
Search by this OE number to find compatible parts
- PORSCHE—91133156130
- PORSCHE—99905904700
- PORSCHE—99905905600
- PORSCHE—99911321840
Where this part fits
Original-fit position for OE 99905904700. The red ring marks where this part installs on the vehicle.
About this product
OPTIMAL Wheel Bearing Set (102603) is manufactured to OEM tolerances, ensuring a direct-fit replacement that restores your vehicle to factory specification without any modification. Technical specifications — Width [mm]: Composite mm, Inner Diameter [mm]: 46 mm, Outer Diameter [mm]: 75 mm, Width 1 [mm]: 21, Rubber mm, Outer Diameter 1 [mm]: 82 mm — are verified against the OEM data sheet to guarantee fitment accuracy and performance parity with the original equipment. Compatible with PORSCHE vehicles; use the vehicle selector above to confirm exact fitment for your make, model, and engine variant. Fitment data is sourced from TecDoc, the authoritative European parts catalogue. This part supersedes original equipment references: 051887B, 91133156130, 99905904700, 99905905600 and 2 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 (2)
Wheel Bearing Set OPTIMAL 102603 — compatible car models
| Car models | PORSCHE: 911 |
|---|---|
| Engines | 3.0 Turbo |
| Year of manufacture | 1963-1990 |
| Manufacturer article number (MPN) | 102603 |
| OE part numbers | 91133156130, 99905904700, 99905905600, 99911321840 |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
OPTIMAL 102603 Wheel Bearing Set. Inner Diameter 1 [mm]: 50 mm. Inner Diameter [mm]: 46 mm. Outer Diameter 1 [mm]: 82 mm. Outer Diameter [mm]: 75 mm. Width 1 [mm]: 21,5 mm. Width [mm]: 18 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 PORSCHE 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 mm; Inner Diameter [mm]: 46 mm; Outer Diameter [mm]: 75 mm; Width 1 [mm]: 21,5 mm; Outer Diameter 1 [mm]: 82 mm; Inner Diameter 1 [mm]: 50 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: 91133156130, 99905904700, 99905905600, 99911321840. 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 £48.99. 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 91133156130?
Yes, this OPTIMAL Wheel Bearing Set is a direct replacement for OE part number 91133156130. 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.
