This idler is a stock size replacement for the steel GT500 Thump Tensioner pulley. Our pulleys are hard black anodized to ensure a durable and long lasting finish. They also come preinstalled with premium bearings.

Weight comparisons:

Thump: 478g (1.05lb)

Billet Pro Shop: 220g (0.5 lb)

*Please install with retaining clip facing the front of the car.

Thump RRR Racing Shelby GT500 Heavy Duty Belt Tensioner

-Comes standard with a 63mm Idler

-Uses a stonger then stock 10.8 strength bolt for mounting

No more belt problems, dented hoods or wasting money on stock tensioners

• Test your car for high performance with peace of mind
• No more broken belt tensioners
• Comes standard with a 63mm Idler
• Uses a stronger than stock 10.8 strength bolt for mounting
• Heavy Duty Construction - 50% Thicker than stock tensioners
• Allows for the option of using an 10 Rib set up or an 8 rib set up
• Keeps the belt from moving, slipping increasing it's lifetime
• Highly recommended for cars with manual transmission

Thump Racing 60mm Double Bearing Billet Aluminum Ribbed Idler Pulley

Surface hardened with anodized clear coating.

For better control of your belt.

Heavy Duty CNC Machined Aluminum Pulley.

Includes stepped bushing and mounting bolt.
Works on both 6 and 8 rib setups.

Available in silver only.

Thump Racing 70mm Billet Aluminum Idler Pulley

Heavy Duty CNC Machined Aluminum Pulley.
Can be used in either the tensioner or idler position.
Works on both 6 and 8 rib setups.
Available in silver only.

Thump Racing Double Bearing 70mm Billet Aluminum Idler Pulley

Surface hardened with anodized clear coating.

Heavy Duty CNC Machined Aluminum Pulley

Includes stepped bushing and mounting bolt.
Works on both 6 and 8 rib setups.

Available in silver only.

Thump Racing 76mm Billet Aluminum Idler Pulley

Surface hardened with anodized clear coating.

Thump Racing Double Bearing 76mm Billet Aluminum Idler Pulley

Surface hardened with anodized clear coating.

Heavy Duty CNC Machined Aluminum Pulley

Includes stepped bushing and mounting bolt.
Works on both 6 and 8 rib setups.

Thump Racing 90mm Billet Aluminum Idler Pulley

Surface hardened with anodized clear coating.

Heavy Duty CNC Machined Aluminum Pulley
Can be used in either the tensioner or idler position.
Works on both 6 and 8 rib setups
Available in silver only.