Compare 26 brands — check fitment and order online
OE part number 100857 is a V-ribbed belt belt tensioner compatible with ACURA, ALFA ROMEO and other makes. Available from 26 brands, priced from £26.99. Every cross-reference listed below matches the same OE specification used by the vehicle manufacturer.
V-ribbed belt belt tensioner OE 100857 prices range from £26.99 to £38.99, with 26 brands offering compatible parts.
Original installation position for OE 100857. The red ring marks where this part installs on the vehicle.

OEM workshop diagram — sourced from manufacturer parts catalogue.
OE 100857 is compatible with the following make/model combinations:
| Make | Models |
|---|---|
| BMW | 3 (E30) |
| VW | BORA I (1J2), GOLF IV (1J1), BORA Variant (1J6), GOLF IV Variant (1J5) +1 |
| MERCEDES-BENZ | 124 Saloon (W124) |
| IVECO | DAILY IV Platform/Chassis |
| SEAT | ALHAMBRA (7V8, 7V9), LEON (1M1) |
Choose a brand to see their compatible parts for OE 100857.
Products matched to OE number 100857.
| Attribute | Value |
|---|---|
| Outer Diameter [mm] | 78 |
| Supplementary Article/Info 2 | without grooves |
| Diameter [mm] | 69 |
| Track rollers material | 6 |
| Belt Pulley Ø [mm] | 65 |
| Weight [kg] | 0,5 |
| Diameter [mm] | 85 |
| Belt Pulley Ø [mm] | 65,1 |
| Deflection Pulley/Guide Pulley Diameter [mm] | 80 |
| Deflection Pulley/Guide Pulley Diameter [mm] | 90 |
Common original equipment numbers linked to stocked alternatives.
OE (Original Equipment) number 100857 is a manufacturer's reference code for V-ribbed belt belt tensioner used to identify the exact specification of a part fitted during vehicle production. By cross-referencing this OE number, you can find 26 compatible aftermarket brands that match the same specification — often at a lower price than the original. All parts listed above are verified to match OE 100857.