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BMW Drive Belts & V-Belts

Your BMW's drive belts are wear items, and will degrade and crack over time. Don't wait until you have a belt failure... don't get stranded! Replacing your BMW's belts, such as the alternator belt, power steering belt, air conditioning AC belt, or serpentine belt is a low cost insurance policy to preventing a break down -- or worse, engine damage. We recommend checking your belts every 10,000 miles. If your belts have excessive cracks, dry rot, missing teeth and/or grooves, are cause noise, it's time for new ones.

While also inspecting your serpentine belts, also check for wear or resistance in the pulleys. The tensioner pulley and deflection pulley are the primary sources for belt squealing. The rubber-isolated pulleys can also break apart, leading to total belt failure. We sell the tensioner and deflection pulleys for the M50 engine family used in the E34, E36, E39, E46, X5, Z3, and Z4.

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Accessory Belt Tensioner Assembly

Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

T#:594655

Part#: 11287810807

Ships in 2 Business Days

$ 148.53

This product was last offered at the strikethrough price on
07-15-2026

$ 138.73 USD

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$ 138.73 USD

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If the accessory belt is sloppy and loose in your vehicle, your generator, and AC might not work properly. Alternatively, if your belt snaps constantly, the tensioner is too tight.

Accessory Belt Tensioner

Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

T#:31622553

Part#: 11288479475

Ships in 4 Business Days

$ 143.99 USD

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$ 143.99 USD

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Mubea Mechanical Belt Tensioner - E70

Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

T#:1195871

Part#: 11287799851

In Stock

$ 141.99 USD

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$ 141.99 USD

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Original equipment German-made tensioner for alternator, A/C and power steering system

Mubea Mechanical Accessory Belt Tensioner - BMW B46/48 B58

Earn 5% back in Turner Rewards on orders placed 10/26/26 - 10/31/26. Redeem 11/26/26 - 12/1/26. Terms & conditions apply

T#:26971839

Part#: 11288580360

Ships in 2 Business Days

$ 177.99

This product was last offered at the strikethrough price on
05-07-2026

$ 160.99 USD

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$ 160.99 USD

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Accessory belt tensioners provide tension to the belt drive system, ensuring the belt is able to properly turn engine accessories without slipping. If your tensioner has failed, replace it with a brand-new unit to ensure proper water pump and alternator functionality.

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BMW Drive Belts & V-Belts

Accessory Belt Tensioner Assembly

Accessory Belt Tensioner

Mubea Mechanical Belt Tensioner - E70

Mubea Mechanical Accessory Belt Tensioner - BMW B46/48 B58

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