The 2021 BMW X4 has 28 belt drive parts with verified fitment on this page — 3 part types and 10 brands, covering both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged. Each part includes a manufacturer part number and application notes.
On the 2021 BMW X4, the belt drive system spins the accessories — serpentine and V-belts, tensioners, idlers and pulleys. All 28 listed parts are Belt (17 parts), Idler Pulley (7 parts) and Belt Tensioner (4 parts).
The 2021 BMW X4 was sold with both the 2.0L L4 Turbocharged and the 3.0L L6 Turbocharged. 5 parts fit every engine; the other 23 are engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2021 BMW X4 belt drive parts are CONTINENTAL (6 parts), GATES (4 parts) and DAYCO (4 parts), plus 7 more brands. Quality grades include Economy and Standard Replacement.
6 parts on this 2021 BMW X4 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including CONTINENTAL 465K6MK (Belt) and CONTINENTAL 50069 (Idler Pulley). Click any part number to see every vehicle that part fits.
Belt
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Popular Fits: 3.0L L6 Turbocharged | 465K6MK | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Mileage MakerSerpentine | View on Amazon |
| GATES Popular Fits: 2.0L L4 Turbocharged | K060455 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Micro-V | View on Amazon |
| GATES Popular Fits: 3.0L L6 Turbocharged | K060465 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Micro-V | View on Amazon |
| CONTINENTAL Fits: 2.0L L4 Turbocharged | 455K6MK | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Mileage MakerMulti V-Belt | View on Amazon |
| DAYCO Fits: 3.0L L6 Turbocharged | 5060465DR | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Drive Rite®Serpentine | View on Amazon |
| FVP Fits: 2.0L L4 Turbocharged | 455K6 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| FVP Fits: 3.0L L6 Turbocharged | 465K6 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| ROADMAX Fits: 2.0L L4 Turbocharged | 6K455AP | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | V-RibbedSerpentine | View on Amazon |
| ROADMAX Fits: 3.0L L6 Turbocharged | 6K465AP | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | V-RibbedSerpentine | View on Amazon |
| ULTRA-POWER Fits: 2.0L L4 Turbocharged | 455K6 | 🇺🇸 US 🇨🇦 CA | Multi-V | View on Amazon |
| ULTRA-POWER Fits: 2.0L L4 Turbocharged | K060455 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Popular Fits: 2.0L L4 Turbocharged | 4060455 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| ACDELCO Fits: 2.0L L4 Turbocharged | 6K455 | 🇺🇸 US 🇨🇦 CA | Professional / GoldSerpentine | View on Amazon |
| ACDELCO Fits: 3.0L L6 Turbocharged | 6K465 | 🇺🇸 US 🇨🇦 CA | Professional / GoldSerpentine | View on Amazon |
| CONTINENTAL Fits: 3.0L L6 Turbocharged | 4060465 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi V-BeltSerpentine | View on Amazon |
| DAYCO Fits: all 2021 X4 engines | 5060455 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Serpentine | View on Amazon |
| DAYCO Fits: 3.0L L6 Turbocharged | 5060465 | 🇺🇸 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.
17 Belt parts are listed for the 2021 BMW X4, from CONTINENTAL, DAYCO, GATES and 4 other brands. CONTINENTAL 465K6MK carries the "Popular" badge. 1 part fits every engine; the other 16 are engine-specific.
In the Economy grade, CONTINENTAL, GATES, FVP and 3 other brands supply 11 parts: the catalog's value-priced group. A representative part number is CONTINENTAL 465K6MK.
The Standard Replacement section lists 6 options from CONTINENTAL, ACDELCO and DAYCO — built to original-equipment specification. CONTINENTAL 4060455 is listed in this group.
Belt Tensioner
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ULTRA-POWER Fits: all 2021 X4 engines | 39381 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Fits: all 2021 X4 engines | 49878 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Multi-V | View on Amazon |
| GATES Fits: all 2021 X4 engines | 39381 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| LITENS Fits: all 2021 X4 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 X4 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.
Part numbers include ULTRA-POWER 39381 and CONTINENTAL 49878, among others listed above.
Idler Pulley
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ÜRO PARTS Fits: 3.0L L6 Turbocharged | 11288673720 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | M Competition or M Model | View on Amazon |
| VAICO Fits: 3.0L L6 Turbocharged | V202769 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Material Type: Plastic | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| CONTINENTAL Popular Fits: 3.0L L6 Turbocharged | 50069 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | SmoothIncludes Hardware | View on Amazon |
| LITENS Popular Fits: 3.0L L6 Turbocharged | 900680A | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Smooth | View on Amazon |
| ACDELCO Fits: 3.0L L6 Turbocharged | 36728 | 🇺🇸 US 🇨🇦 CA | Professional / Gold | View on Amazon |
| DAYCO Fits: 3.0L L6 Turbocharged | 89551 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Smooth | View on Amazon |
| GATES Fits: 3.0L L6 Turbocharged | 36728 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Smooth | View on Amazon |
This table covers the idler pulleys the belt wraps around. Typical signs include a chirp that follows engine speed, or a pulley that feels rough or has play. Replace a noisy idler with the belt — the labor is already paid for.
7 Idler Pulley parts are listed for the 2021 BMW X4, from ÜRO PARTS, VAICO, CONTINENTAL and 4 other brands. CONTINENTAL 50069 carries the "Popular" badge.
Economy: 2 parts, from ÜRO PARTS and VAICO. A representative part number is ÜRO PARTS 11288673720.
The Standard Replacement section: 5 options from CONTINENTAL, LITENS, ACDELCO and 2 other brands. CONTINENTAL 50069 is listed in this group.
Part numbers include CONTINENTAL 50069, ÜRO PARTS 11288673720 and VAICO V202769, among others listed above.
Buying Belt Drive Parts for a 2021 BMW X4
On this vehicle, the belt drive system spins the accessories — serpentine and V-belts, tensioners, idlers and pulleys.
- Match the engine first. Some belt drive parts fit every engine; others are engine-specific. Each row shows which engine(s) it fits.
- 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 Idler Pulley .
Frequently Asked Questions
How many belt drive parts fit the 2021 BMW X4?
Our catalog currently lists 28 belt drive parts for the 2021 BMW X4 across 3 subcategories and 10 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 X4 engines?
Some do. 5 parts fit every engine; the other 23 are engine-specific. Each row (and the filter at the top) shows which. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of belt drive problems on a 2021 BMW X4?
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 X4 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 X4?
First match the engine — each row shows which engine(s) the part fits. 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 X4
Belt Drive Parts for Other BMW X4 Years
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