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Details
| Specification | Value |
|---|---|
| Brand | OPTIMAL |
| MPN | bt-1820 |
| Fitting Position | Rear Axle |
| Height [mm] | 66 mm |
| Bore Diameter [mm] | 12.4 mm |
| Drum diameter [mm] | 200 mm |
| Outer brake drum diameter [mm] | 226 mm |
| max. brake drum reboring dimension [mm] | 201 mm |
| Inner brake drum height [mm] | 32 mm |
| Hole Arrangement/Number | 4/4 |
| Bolt Hole Circle Ø [mm] | 114.3 mm |
OE/OEM numbers (1)
Search by this OE number to find compatible parts
- MAZDA—B092-26-251
Where this part fits
Original-fit position for OE B09226251. The red ring marks where this part installs on the vehicle.
About this product
Sourced from OPTIMAL, this brake drum (BT-1820) combines precision engineering with durable materials to meet the demands of everyday driving and extended service intervals. Technical specifications — Fitting Position: Rear Axle, Height [mm]: 66 mm, Bore Diameter [mm]: Zinc, Copper mm, Drum diameter [mm]: 200 mm, Outer brake drum diameter [mm]: 226 mm — are verified against the OEM data sheet to guarantee fitment accuracy and performance parity with the original equipment. Verified to fit MAZDA 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: 0 986 477 091, 14.5828.10, 15.0151, 18-0282 and 9 more. Matching these numbers confirms a like-for-like replacement with no loss of function. OPTIMAL is a recognised supplier of automotive braking 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.
Brake Drum buying guide
Why replace this part?
The brake drum provides the friction surface against which the brake shoes press to slow the vehicle. Scored, cracked, or excessively worn drums reduce braking effectiveness and generate heat and noise that accelerates shoe wear.
Signs you need a replacement
- Pulsating or grabbing rear brakes
- grinding or scraping noise from the rear when braking
- deep scoring visible on the drum friction surface
- drum thickness below minimum specification
- vibration from the rear under braking
When to replace
Measure drum diameter at each brake service. Replace when worn to minimum specification or when scoring depth exceeds 0.5mm. Always replace as an axle pair.
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 (14)
Brake Drum OPTIMAL BT-1820 — compatible car models
| Car models | MAZDA: 323 III Hatchback (BF), 323 III Saloon (BF) |
|---|---|
| Engines | 1.1 |
| Year of manufacture | 1985-2004 |
| Manufacturer article number (MPN) | BT-1820 |
| OE part numbers | B092-26-251 |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
OPTIMAL bt-1820 . Bolt Hole Circle Ø [mm]: 114,3 mm. Bore Diameter [mm]: 12,4 mm. Drum diameter [mm]: 200 mm. Fitting Position: HA. Height [mm]: 66 mm. Hole Arrangement/Number: 4/4. Inner brake drum height [mm]: 32 mm. max. brake drum reboring dimension [mm]: 201 mm
- 1x Brake Drum
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 Brake Drum compatible with my car?
This Brake Drum fits MAZDA 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 Brake Drum have?
This OPTIMAL Brake Drum has the following specifications: Fitting Position: HA; Height [mm]: 66 mm; Bore Diameter [mm]: 12,4 mm; Drum diameter [mm]: 200 mm; Outer brake drum diameter [mm]: 226 mm; max. brake drum reboring dimension [mm]: 201 mm. Check the full specifications table above for complete details.
What OE part numbers does this Brake Drum replace?
This Brake Drum replaces OE part numbers: B092-26-251. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a Brake Drum cost?
This OPTIMAL Brake Drum is available for £42.99. Brake Drum 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 Brake Drum?
Watch for a grinding or scraping noise when braking, the vehicle pulling to one side, a pulsating brake pedal, or visible scoring and heat cracks on the drum surface. Replace when worn beyond the maximum diameter stamped on the drum.
What tools do I need to replace a Brake Drum?
Tools needed: floor jack and axle stands, lug wrench, brake drum puller (if seized), wire brush, brake cleaner, torque wrench. Difficulty: Moderate DIY. Safety warning: Brake dust inside drums on older vehicles may contain asbestos -- wear an approved respirator and do not use compressed air to clean.
Can I use this part as a replacement for OE B092-26-251?
Yes, this OPTIMAL Brake Drum is a direct replacement for OE part number B092-26-251. 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.
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