Protect your MINI’s supercharged engine from costly belt failure damage with the ALTA Tensioner Stop. Designed specifically for R53-based MINI Cooper S models, this precision-fit component limits the range of motion of the OEM belt tensioner to prevent it from colliding with the crank pulley if the serpentine belt breaks—a known failure point that can result in hundreds of dollars in repairs.

Made for easy installation without removing the tensioner assembly, the ALTA Tensioner Stop is a smart and cost-effective safeguard. Its unique design allows full OEM tensioner operation under normal conditions, only engaging when the original tensioner stop fails. This simple add-on delivers long-term protection with no maintenance required.

Key Features:

• Prevents Costly Engine Damage – Protects crank pulley and tensioner during belt failure

• No Interference with OEM Operation – Matches OEM travel limits, only engages if the stock stop fails

• Quick & Easy Installation – No need to remove the tensioner assembly; saves ~30 minutes labor

• Durable Construction – Zero-failure design backed by ALTA’s 5-year limited warranty

• Ideal for Supercharged MINIs – Purpose-built for R53 and R52 Cooper S applications

Vehicle Fitment:

• 2002–2006 MINI Cooper S (R53)

• 2004–2008 MINI Cooper S Cabrio (R52)

• 2002–2006 MINI Cooper S Automatic (R53)

What’s Included:

• (1) ALTA Tensioner Stop

• Installation Instructions

• ALTA Performance Sticker