Belts All Types

Drive belt deflection roller.

Fits:
Porsche 996 Carrera 3.4L / 3.6L 1997-05 Tiptronic gearbox
Porsche 997.1 Carrera 3.6L 2005-08 Tiptronic gearbox
Porsche 986 Boxster 2.5L 2.7L / 3.2L 1997-04 Manual & Tiptronic gearbox
Porsche 987.1 Boxster 2.7L / 3.2L / 3.4L 2005-08 Tiptronic gearbox
Porsche 987C.1 Cayman 2.7L / 3.4L 2005-08 Tiptronic gearbox

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Diagram ref No 15

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99610211856

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Drive belt deflection roller.

Fits:
Porsche 996 Carrera 3.4L / 3.6L 1997-05 Tiptronic gearbox
Porsche 997.1 Carrera 3.6L 2005-08 Tiptronic gearbox
Porsche 986 Boxster 2.5L 2.7L / 3.2L 1997-04 Manual & Tiptronic gearbox
Porsche 987.1 Boxster 2.7L / 3.2L / 3.4L 2005-08 Tiptronic gearbox
Porsche 987C.1 Cayman 2.7L / 3.4L 2005-08 Tiptronic gearbox

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Diagram ref No 15

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99610211856

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Drive belt deflection roller.

Fits:
Porsche 996 Carrera 3.4L / 3.6L 1997-05 6-speed Manual transmission
Porsche 997.1 Carrera 3.6L / 3.8L 2005-08 Manual transmission
Porsche 987.1 Boxster 2.7L / 3.2L / 3.4L 2005-08 Manual transmission
Porsche 987C.1 Cayman 2.7L / 3.4L 2005-08 Manual transmission

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Diagram ref No 12

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99710211900

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Drive belt deflection roller.

Fits:
Porsche 996 Carrera 3.4L / 3.6L 1997-05 Tiptronic gearbox
Porsche 997.1 Carrera 3.6L 2005-08 Tiptronic gearbox
Porsche 986 Boxster 2.5L / 2.7L / 3.2L 1997-04 Manual & Tiptronic gearbox
Porsche 987.1 Boxster 2.7L / 3.2L /3.4L 2005-08 Tiptronic gearbox
Porsche 987C.1 Cayman 2.7L / 3.4L 2005-08 Tiptronic

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Diagram ref No 12

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99610211958

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Drive belt deflection roller.
Also referred to as a relay roller or deflection roller, responsible for guiding and maintaining proper routing and tension of the accessory drive belt system.

Fits:
Porsche 996 Carrera 3.4L / 3.6L 1997 - 2005 Tiptronic gearbox
Porsche 997.1 Carrera 3.6L 2005 - 2008 Tiptronic gearbox
Porsche 986 Boxster 2.5L / 2.7L / 3.2L 1997 - 2004 Manual & Tiptronic gearbox
Porsche 987.1 Boxster 2.7L / 3.2L /3.4L 2005 - 2008 Tiptronic gearbox
Porsche 987C.1 Cayman 2.7L / 3.4L 2005 - 2008 Tiptronic

Diagram ref No 12

The idler pulley supports the accessory drive belt, helping to:
•  Maintain proper belt routing and tension, preventing slipping and reducing premature wear.
•  Guide the belt around engine accessories such as the alternator, power steering pump, A/C compressor, and water pump.
•  Ensure smooth operation of components driven by the belt for optimal engine performance.
If the idler pulley wears out or the bearing fails, you may hear squealing, chirping, or grinding noises, see uneven belt wear, or experience belt misalignment - indicators it’s time for replacement.

A worn or failing idler pulley can cause the drive belt to slip, misalign, or break, which can in turn disrupt power to critical engine accessories. Symptoms include belt noise, squealing, or loss of accessory function (e.g., A/C, alternator charging), potentially leading to more costly repairs if ignored. Replacing it with an OE Match pulley ensures proper belt tension and routing, helping keep your engine’s accessory systems functioning smoothly.

Replace the idler pulley if you notice any of the following:
•  Squealing, chirping, or grinding noises from the belt area
•  Visible belt misalignment or excessive wear
•  Pulley bearing play or rough rotation to the touch
•  Cracks or deterioration of the pulley surface

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99610211958

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Drive belt deflection roller.

Fits:
Porsche 996 Carrera 3.4L / 3.6L 1997-05 6-speed Manual transmission
Porsche 997.1 Carrera 3.6L / 3.8L 2005-08 Manual transmission
Porsche 987.1 Boxster 2.7L / 3.2L / 3.4L 2005-08 Manual transmission
Porsche 987C.1 Cayman 987C 2.7L / 3.4L 2005-08 Manual transmission

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Diagram ref no 15

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99710211800

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Drive belt deflection roller.
This tensioner (or idler) pulley is designed for Porsche 911 (996/997) and Boxster/Cayman vehicles. It supports the serpentine/drive belt system, ensuring smooth, stable rotation and correct belt alignment. It helps maintain proper tension, reduces noise, and protects engine accessories from excessive stress. Built to original Porsche standards and engineered for precise fitment and durability.

Fits:
Porsche 996 Carrera 3.4L / 3.6L 1997-05 6-speed Manual transmission
Porsche 997.1 Carrera 3.6L / 3.8L 2005-08 Manual transmission
Porsche 987.1 Boxster 2.7L / 3.2L / 3.4L 2005-08 Manual transmission
Porsche 987C.1 Cayman 987C 2.7L / 3.4L 2005-08 Manual transmission

Diagram ref no 15

Ideal replacement when the original pulley shows signs of wear, bearing noise, belt misalignment or visible belt damage - restoring accessory-drive reliability and avoiding secondary damage from belt failure.

The idler pulley plays a critical role in your accessory belt drive, maintaining the correct path and tension of the belt that powers many engine-mounted systems. When the pulley bearing deteriorates, or the surface becomes worn or grooved, the belt can slip, make noise, or even break—potentially causing loss of alternator, AC compressor or power-steering function. By replacing this component proactively with a quality OE-Match unit, you safeguard those systems and maintain proper engine accessory operation.

When and why to replace:
• Audible bearing noise or rumble coming from the pulley/belt area.
• Visible belt wear, glazing, fraying or mis-tracking across the pulley surface.
• Occasional belt slippage or accessory drive belt squeal on start-up or load.
• Accessory drive servicing (belt replacement, tensioner replacement) where it makes sense to fit the pulley at the same time.
• Higher-mileage vehicle where original pulley may have been in service for many years and bears may be near end-of-life.

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99710211800

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Drive belt deflection roller.
A direct-fit idler/deflection pulley for the auxiliary (serpentine) drive belt. Built to OE geometry, it guides the belt path, stabilises belt tracking, and helps maintain correct wrap on the alternator, A/C compressor and power-steering/water pump pulleys.

Fits:
Porsche 996 Carrera 3.4L / 3.6L 1997-05 6-speed Manual transmission
Porsche 997.1 Carrera 3.6L / 3.8L 2005-08 Manual transmission
Porsche 987.1 Boxster 2.7L / 3.2L / 3.4L 2005-08 Manual transmission
Porsche 987C.1 Cayman 2.7L / 3.4L 2005-08 Manual transmission

Diagram ref No 12

The deflection roller maintains smooth, stable tension in the auxiliary belt system. It helps guide the belt precisely over pulleys, reduces vibration, and ensures efficient power delivery to engine accessories such as the alternator, A/C compressor, and power steering pump. Built with OE-spec bearings, it delivers quiet operation and long-lasting reliability under high-speed, high-load conditions.

Over time, the bearing inside the roller can wear, dry out, or seize due to constant load and heat exposure. A failing roller may cause belt noise, vibration, or premature belt wear, potentially leading to accessory drive failure.

Replace the deflection roller when:
• You hear squeaking, chirping, or grinding from the belt area
• The pulley feels rough or loose when rotated by hand
• During belt or tensioner replacement as preventive maintenance
• There are signs of belt misalignment or edge fraying

Installing a new deflection roller ensures correct belt tracking, quiet performance, and dependable accessory drive operation.

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99710211900

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Drive belt tensioning roller.

Fits:
Porsche 996 Carrera 3.4L / 3.6L 6-speed Manual transmission
Porsche 997.1 Carrera 3.6L / 3.8L 6-speed Manual transmission
Porsche 987.1 Boxster 2.7L / 3.2L /3.4L 2004-08 Manual transmission
Porsche 987C.1 Cayman 2.7L / 3.4L 2005-08 Manual transmission

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Diagram ref no 8

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99710211700

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The Drive Belt Tensioning Roller, identified by part number 997.102.117.00, is a critical component in the accessory drive system of several Porsche models, including the 996, 987 (Boxster and Cayman), and 997 (Carrera) equipped with manual transmissions. This roller maintains proper tension on the serpentine belt, ensuring the efficient operation of engine accessories such as the alternator, power steering pump, and air conditioning compressor.

Fits:

• Porsche Boxster 987 S 3.2/3.4L 2005-08/08  Manual transmission
• Porsche 996 C2 3.4L 1997-08/01  6-speed Manual transmission
• Porsche 996 C4 3.4L 1997-08/01  6-speed Manual transmission
• Porsche 996 C2 3.6L 09/01-2005  6-speed Manual transmission
• Porsche 996 C4 3.6L 09/01-2005  6-speed Manual transmission
• Porsche 996 C4S 3.6L 09/01-2005  6-speed Manual transmission
• Porsche 997 MK1 Carrera 2 3.6L 2005-08  6-speed Manual transmission
• Porsche 997 MK1 Carrera 2S 3.8L 2005-08  6-speed Manual transmission
• Porsche 997 MK1 Carrera 4 3.6L 2005-08  6-speed Manual transmission
• Porsche 997 MK1 Carrera 4S 3.8L 2005-08  6-speed Manual transmission
• Porsche Cayman 2.7L 987C 2006-08  Manual transmission
• Porsche Cayman S 3.4L 987C 2005-08  Manual transmission

Common Tensioning Roller Issues and Why Replacement is Necessary. Over time, a tensioning roller can wear down due to constant exposure to engine heat and mechanical stress. Typical problems include:

• Bearing Wear: The internal bearing may deteriorate, causing noise and reducing performance.
• Seized Pulley: Rust or corrosion can lock the pulley, disrupting proper belt tension.
• Cracked or Damaged Pulley: Physical damage can misalign the belt and hinder the roller’s function.
• Replacing a worn tensioning roller is crucial to maintain proper belt operation, prevent squealing noises, and avoid potential damage to other engine components.

Diagram ref no 8

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99710211700

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Drive belt tensioning roller.

Fits:

Porsche 986 Boxster 2.7L / 3.2L / 3.4L Manual or Tiptronic gearbox
Porsche 996 Carrera 3.4L / 3.6L 1997-05 Tiptronic gearbox
Porsche 997.1 Carrera 3.6L 2005-08 Tiptronic gearbox
Porsche 987.1 Boxster 2.7L / 3.2L / 3.4L 2005-08 Tiptronic gearbox
Porsche 987C.1 Cayman 2.7L / 3.4L 2005-08 Tiptronic gearbox

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Diagram ref No 8

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99610211757

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Drive Belt Tensioning Roller.

The OE MATCH Drive Belt Tensioning Roller is a high-quality replacement auxiliary drive belt component designed for selected Porsche 986 Boxster, 996 Carrera, 987 Boxster, 987 Cayman and 997 Carrera models.

Fits:

• Porsche 986 Boxster 2.7L / 3.2L / 3.4L Manual or Tiptronic gearbox
• Porsche 996 Carrera 3.4L / 3.6L 1997-05 Tiptronic gearbox
• Porsche 997.1 Carrera 3.6L 2005-08 Tiptronic gearbox
• Porsche 987.1 Boxster 2.7L / 3.2L / 3.4L 2005-08 Tiptronic gearbox
• Porsche 987C.1 Cayman 2.7L / 3.4L 2005-08 Tiptronic gearbox

Diagram Ref No 8

Manufactured to provide OE-style fitment and dependable performance, this tensioning roller helps maintain correct auxiliary drive belt operation by supporting the belt tensioning mechanism and ensuring smooth belt movement.

Also known as a belt tensioner pulley, this component works alongside the belt tensioner assembly to help maintain the correct tension and alignment of the engine's auxiliary drive belt. This allows belt-driven accessories, including the alternator, water pump and other applicable components, to operate efficiently.

The roller incorporates a rotating bearing assembly designed to withstand continuous operation, engine vibration and varying rotational speeds.

Over time, exposure to engine heat, bearing fatigue, contamination and mechanical stress can cause the original roller to deteriorate, resulting in unwanted noise, excessive movement or bearing failure.

Ideal for replacing worn, noisy, seized or damaged original rollers, the OE MATCH Drive Belt Tensioning Roller offers a practical replacement solution for routine servicing, preventative maintenance and auxiliary drive system repairs.

What This Product Does:
The drive belt tensioning roller forms part of the engine's auxiliary belt tensioning system. It provides a smooth rotating contact surface for the drive belt while working with the tensioner mechanism to maintain the correct belt tension and routing.

Its key functions include:

• Drive Belt Tension Support: Works with the tensioning mechanism to help maintain the correct operating tension of the auxiliary drive belt.
• Belt Guidance: Helps guide the belt along its designated route around the engine's pulley system.
• Smooth Belt Rotation: The integrated bearing allows the roller to rotate freely as the drive belt moves across its surface.
• Belt Alignment: Helps maintain correct belt tracking and reduces unwanted lateral movement.
• Auxiliary Component Operation: Supports reliable power transmission to belt-driven accessories, including the alternator and water pump where applicable.
• Reduced Belt Slippage: Helps maintain consistent belt contact with the surrounding pulleys.
• Vibration Reduction: Contributes to stable belt operation by helping minimise excessive movement and vibration.
• Reduced Operating Noise: A correctly functioning roller helps maintain smooth and quiet auxiliary belt operation.
• Premature Belt Wear Prevention: Proper pulley rotation and alignment help reduce unnecessary belt friction and uneven wear.
• OE-Style Replacement: Maintains the original auxiliary drive belt arrangement without requiring modification.

Symptoms Of Wear Or Failure:
Over time, continuous rotation, engine heat, vibration and bearing wear can cause the drive belt tensioning roller to deteriorate.

Common signs include:

• Squealing or Chirping Noises: High-pitched sounds from the auxiliary belt area may indicate worn bearings, belt slippage or incorrect belt alignment.
• Grinding or Rumbling Sounds: A deteriorating roller bearing may produce grinding, growling or rumbling noises while the engine is operating.
• Excessive Pulley Play: Side-to-side movement or looseness can indicate wear within the roller bearing.
• Rough Pulley Rotation: A worn bearing may feel rough, notchy or resistant when rotated by hand with the belt removed.
• Seized or Sticking Roller: Severe bearing failure can prevent the pulley from rotating freely, creating excessive friction against the drive belt.
• Visible Pulley Wobble: A damaged bearing or mounting arrangement may cause the roller to rotate unevenly.
• Uneven Drive Belt Wear: Incorrect pulley alignment can cause accelerated wear, fraying or damage along the belt edges.
• Cracked or Damaged Pulley Surface: Physical damage, cracking or deformation may affect correct belt operation.
• Excessive Belt Vibration: A worn roller or faulty tensioning mechanism may cause the belt to move excessively while the engine is running.
• Burning Rubber Smell: A seized or partially seized roller can generate friction and heat, potentially damaging the belt.
• Drive Belt Slipping or Dislodging: Severe roller wear or incorrect alignment may cause the belt to slip or move out of position.
• Auxiliary Component Failure: If the roller seizes and causes the drive belt to break, belt-driven accessories may stop operating.
• Battery Charging Warning: Loss of auxiliary belt drive can prevent the alternator from charging the battery correctly.

Why Replacement Matters:

• Replacing a worn or damaged drive belt tensioning roller is an important part of maintaining the reliability, performance and correct operation of your Porsche's auxiliary drive belt system.
• The auxiliary drive belt transfers rotational power from the engine to essential accessories. The tensioning roller plays a vital role in supporting the belt tensioning mechanism and maintaining smooth belt movement.
• As the roller bearing deteriorates, it can develop excessive friction, looseness or noise. Continued operation with a worn roller may result in incorrect belt alignment, increased vibration and premature drive belt wear.
• If the bearing becomes severely damaged or seizes completely, the drive belt can overheat, shred or break, potentially causing the sudden loss of important belt-driven accessories.
• Depending on the engine configuration, auxiliary belt failure can affect the alternator and water pump. Loss of alternator operation may lead to battery discharge and electrical system problems, while loss of water pump drive can result in engine overheating.
• A damaged tensioning roller may also increase stress on the surrounding tensioner assembly, guide pulleys and drive belt, potentially leading to additional component damage and more expensive repairs.
• Installing a replacement OE MATCH tensioning roller helps restore smooth bearing rotation, proper belt guidance and dependable auxiliary drive operation.
• Replacing worn rollers during scheduled belt servicing is particularly beneficial, as it provides an opportunity to inspect the condition of the drive belt, tensioner and associated pulleys before a more serious failure occurs.
• For Porsche owners, maintaining the auxiliary drive system is essential for dependable everyday operation, particularly on ageing vehicles where original pulley bearings may have experienced years of heat exposure and continuous use.
• The OE MATCH Drive Belt Tensioning Roller 99610211757/1 provides an OE-style replacement solution designed to maintain reliable belt operation, reduce unwanted noise and help protect essential engine accessories.

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99610211757

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Lightweight Under drive Pulley is made from 6061-T6 aluminium. Offers improved HP & TQ by reducing drag from the power steering pump, A/C, water pump and alternator.

Pulley outer diameter: 123mm (measured from ribs to ribs)

Increase your engine output by reducing the draw of the engine's ancillaries ie the power steering pump, Air Conditioning, water pump and alternator by slowing them down and reducing the horsepower they use.

Underdrive pulley is one of the cheapest returns for the money spent when it comes to actual performance and horsepower gains for track and street use cars.

Installation tool (wrench) included, new OEM crankshaft pulley bolt is recommended but not included with this product.

Note: In order to accommodate the smaller diameter pulley, the timing boss on the engine case must be shortened using die grinder or similar tool (see link for instructions below).

Replacement Pulley for Original Porsche parts No. 99610211563

Fits:
Porsche 996 3.4L
Porsche 996 3.6L
Porsche 997 3.6L
Porsche Boxster 986
Porsche Boxster 987
Porsche Cayman 987C

**Please note you will need a new shorter Pully Belt which you can purchase from us.
99610215199/1
Under drive pulley w/ air conditioning - 2100mm

99610215198/1
Under drive pulley w/o air conditioning - 1905mm

Underderive Pulley Installation Instructions - CLICK HERE

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3609001601

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Drive belt for cars WITH Air con.

Fits:
Porsche 996 Carrera
Porsche 986 Boxster
Porsche 997 Carrera MKI
Porsche 987 Boxster MKI
Porsche 987C Cayman MKI

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Diagram ref no 27

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99610215168

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