This page lists 13 belt drive parts for the 2021 BMW Z4, across 2 part types, covering both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged. Every part shows its brand, manufacturer part number and fitment notes.
On the 2021 BMW Z4, the belt drive system spins the accessories — serpentine and V-belts, tensioners, idlers and pulleys. All 13 listed parts are Belt (9 parts) and Belt Tensioner (4 parts).
The 2021 BMW Z4 was sold with both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged. All 13 parts on this page fit every engine.
The most listed brands for 2021 BMW Z4 belt drive parts are CONTINENTAL (3 parts), ULTRA-POWER (3 parts) and GATES (2 parts), plus 5 more brands. Quality grades include Economy and Standard Replacement.
2 parts on this 2021 BMW Z4 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including GATES K060455 (Belt) and CONTINENTAL 4060455 (Belt). Click any part number to see every vehicle that part fits.
Belt
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GATES Popular Fits: all 2021 Z4 engines | K060455 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Micro-V | View on Amazon |
| CONTINENTAL Fits: all 2021 Z4 engines | 455K6MK | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Mileage MakerMulti V-Belt | View on Amazon |
| FVP Fits: all 2021 Z4 engines | 455K6 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| ROADMAX Fits: all 2021 Z4 engines | 6K455AP | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | V-RibbedSerpentine | View on Amazon |
| ULTRA-POWER Fits: all 2021 Z4 engines | 455K6 | 🇺🇸 US 🇨🇦 CA | Multi-V | View on Amazon |
| ULTRA-POWER Fits: all 2021 Z4 engines | K060455 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Popular Fits: all 2021 Z4 engines | 4060455 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| ACDELCO Fits: all 2021 Z4 engines | 6K455 | 🇺🇸 US 🇨🇦 CA | Professional / GoldSerpentine | View on Amazon |
| DAYCO Fits: all 2021 Z4 engines | 5060455 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Serpentine | View on Amazon |
This table covers the serpentine and accessory belts that drive the front accessories. Typical signs include squeal on cold start, cracks across the ribs, or glazing on the back of the belt. A new belt on a worn tensioner will squeal within weeks — spin the idlers by hand while the belt is off.
9 Belt parts are listed for the 2021 BMW Z4, from CONTINENTAL, ULTRA-POWER, GATES and 4 other brands. GATES K060455 carries the "Popular" badge. All of them fit every engine offered in the 2021 Z4.
In the Economy grade, ULTRA-POWER, GATES, CONTINENTAL and 2 other brands supply 6 parts: the catalog's value-priced group. A representative part number is GATES K060455.
The Standard Replacement section lists 3 options from CONTINENTAL, ACDELCO and DAYCO — built to original-equipment specification. CONTINENTAL 4060455 is listed in this group.
This group includes GATES K060455, CONTINENTAL 455K6MK and FVP 455K6 and the remaining parts above.
Belt Tensioner
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ULTRA-POWER Fits: all 2021 Z4 engines | 39381 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Fits: all 2021 Z4 engines | 49878 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi-V | View on Amazon |
| GATES Fits: all 2021 Z4 engines | 39381 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| LITENS Fits: all 2021 Z4 engines | 999682A | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the automatic tensioners that hold belt tension. Typical signs include belt flutter, a chirp that returns after a new belt, or a damper that no longer holds the arm. Replace the tensioner with the belt at higher mileage; the labor overlaps almost entirely.
4 Belt Tensioner parts for the 2021 BMW Z4 come from 4 brands — ULTRA-POWER, CONTINENTAL, GATES and 1 other brand. Every part fits both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged.
The Economy section: 1 option from ULTRA-POWER. ULTRA-POWER 39381 is listed in this group.
Standard Replacement: 3 parts, from CONTINENTAL, GATES and LITENS. A representative part number is CONTINENTAL 49878.
This group includes ULTRA-POWER 39381 and CONTINENTAL 49878 and the remaining parts above.
Buying Belt Drive Parts for a 2021 BMW Z4
On this vehicle, the belt drive system spins the accessories — serpentine and V-belts, tensioners, idlers and pulleys.
- You do not need to pick an engine: every belt drive part on this page fits both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the tensioner and idler pulleys with any belt at higher mileage — the labor overlaps almost entirely.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Belt and Belt Tensioner .
Frequently Asked Questions
How many belt drive parts fit the 2021 BMW Z4?
Our catalog currently lists 13 belt drive parts for the 2021 BMW Z4 across 2 subcategories and 8 brands, covering both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged. Each part is matched to the engine(s) it fits.
Do belt drive parts differ between 2021 BMW Z4 engines?
No. On this page every belt drive part fits both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged. You do not need to pick an engine to choose the right row — use the notes for position and trim.
What are the signs of belt drive problems on a 2021 BMW Z4?
Common symptoms include squealing on cold start, a belt that shows cracking or glazing, or an accessory that slows under load. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the tensioner and idler pulleys with any belt at higher mileage — the labor overlaps almost entirely.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 BMW Z4 was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 BMW Z4?
Every part on this page already fits both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged. Then a new belt on a worn tensioner will squeal within weeks — check tensioner damping and idler bearings while the belt is off. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 BMW Z4
Belt Drive Parts for Other BMW Z4 Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.