The UPD high performance M112K 3 piece idler set will replace your stock plastic double idler pulley assemble and tensioner pulley with a high quality CNC billet aluminum machined performance pulley set. High quality Nachi bearings are used and only double bearings seals are used to protect bearings from heat and dirt. All our billet performance idlers have a ultra hard anodized coating. Our leading AMG Mercedes idler designs have been on the market since 2009 and installed on thousands of AMG cars!

The ribbed idler included in the kit is designed with duel bearings and custom spacers to replace the known to fail m112k ribbed upper idler. custom billet Bearing shields included with both 90mm smooth idlers.

• CNC billet aluminum with hard anodized coating
• High speed Nachi bearings
• Smooth and quiet running
• Easy install
• Made in USA and highest quality available
• Replace your idlers with UPD`s performance idler set today, as the stock AMG plastic idler`s, with rubber bearing seals, are known to fail from the high heat and dirty conditions under the hood.

Replaces all factory idlers and if you have a modified idler parts on your engine, you may have removed idlers or relocated them, please check before purchasing complete 3 piece kit. 

Specs:

• 2x large smooth idlers are 90mm dia. x 31.7mm wide
• 1x ribbed idler 64.6 mm dia to the belt surface and 33.6mm wide
• Special long slotted design is used to help improve cooling, reduce weight (less weight also reduces bearing stress), and reduce noise and centrifugal friction.
• Ultra hard coated anodized!