# Horizon Fitness Treadmill Paragon II Idler Assembly 35000518 (MX555)

\## Horizon Fitness Paragon II Treadmill Idler Assembly 35000518

The Horizon Fitness Treadmill Paragon II Idler Assembly is a preowned replacement part for the Horizon Fitness Paragon II treadmill. It can help replace a worn, damaged, or missing idler assembly when you are restoring or repairing this specific treadmill model. The part number is \*\*35000518\*\*, and the seller identifies it by SKU \*\*MX555\*\*.

## Product Details and Benefits

This product is an \*\*idler assembly for a Horizon Fitness treadmill\*\*. As a replacement component, it gives treadmill owners and repair technicians a way to replace the original assembly instead of replacing the entire machine. Using the correct part can support a more direct repair process and help extend the service life of an existing Paragon II treadmill.

The assembly is sold in \*\*preowned condition\*\*. Each part receives inspection by skilled technicians before shipment. This inspection helps confirm that the part matches the listed model and component type. Because the inventory includes multiple units, the physical appearance may vary slightly from the images shown on the product page. These differences can include minor cosmetic details, but the seller states that the shipped item will be the exact model and part identified in the listing.

Choosing a used treadmill replacement part can also reduce unnecessary waste. Reusing serviceable fitness equipment components helps keep parts in circulation and may offer a more practical repair option than replacing a complete treadmill.

## Compatibility and Applications

This idler assembly is identified for the following equipment:

\- \*\*Brand:\*\* Horizon Fitness  
\- \*\*Treadmill model:\*\* Paragon II  
\- \*\*Part name:\*\* Idler Assembly  
\- \*\*Part number:\*\* 35000518  
\- \*\*SKU:\*\* MX555  
\- \*\*Condition:\*\* Preowned

The part is intended for repair or maintenance work on a \*\*Horizon Fitness Paragon II treadmill\*\*. It is not listed as a universal treadmill component. Before ordering, compare the part number and assembly on your equipment with the information provided here. If your treadmill uses a different model, revision, or part number, confirm compatibility before purchase.

\### Why Choose This Replacement Part

This Horizon Fitness Paragon II idler assembly may suit owners, fitness equipment repair businesses, and technicians who need a replacement component for an existing treadmill. It provides a way to repair a specific machine while keeping the original equipment in use. The preowned condition may also make it a useful choice for customers seeking a replacement part without sourcing a complete new treadmill.

The seller inspects each part before listing it and carries multiple units. That approach allows the listing to provide the correct model and component while acknowledging that individual pieces may show slight visual differences.

## Before You Buy

Confirm that your treadmill is a \*\*Horizon Fitness Paragon II\*\* and that the required replacement carries part number \*\*35000518\*\*. The product SKU is \*\*MX555\*\*. Review the product images for general reference, but remember that the shipped part may look slightly different because inventory varies. Contact the seller if you need additional information about the individual assembly before ordering.

## Details

- **Price:** 24.99 USD
- **Vendor:** Horizon Fitness
- **Type:** Miscellaneous
- **Tags:** All

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 24.99 USD | In stock |

## Images

- MX555
- MX555
- MX555
- MX555

## Additional Information

- **PartNumber:** 35000518
- **Condition:** PREOWNED

---

> Source: [Cardio Equipment Parts](https://www.cardioequipmentparts.com/products/horizon-fitness-treadmill-paragon-ii-idler-assembly-35000518-mx555)
> Updated: 2026-08-29