# Life Fitness R9 Upright Bike Extrusion AK39-00029-0004 (MX423)

\## Life Fitness R9 Upright Bike Extrusion AK39-00029-0004 (MX423)

The Life Fitness R9 Upright Bike Extrusion AK39-00029-0004 is a replacement component identified for a Life Fitness R9 upright exercise bike. This part may help replace an existing extrusion that is damaged, worn, missing, or no longer suitable for use. If you are repairing or restoring a Life Fitness R9 bike, this product gives you a clearly identified part number to compare with the component currently installed on your equipment.

## Product Details and Benefits

This Life Fitness replacement part carries the manufacturer part number \*\*AK39-00029-0004\*\* and the product identifier \*\*MX423\*\*. The product is listed under the Life Fitness brand and is associated with the \*\*R9 Upright Bike\*\*.

The item is identified as an \*\*extrusion\*\*, so buyers should use the part name and part number when checking repair records, equipment diagrams, or existing components. Matching the exact number helps reduce the risk of ordering a visually similar part that does not correspond to the required bike assembly.

A correctly matched replacement extrusion can support the repair of an existing Life Fitness R9 upright bike. Replacing the identified component may help you keep the equipment in service instead of replacing the entire machine. It may also assist a service technician or facility maintenance team when organizing parts for an equipment repair.

This listing identifies the product as \*\*MX423\*\* and includes the following serial number reference: \*\*CEI103395\*\*. Keep these identifiers available when contacting a service department or comparing the part with your equipment records.

## Compatibility and Applications

The Life Fitness R9 Upright Bike Extrusion AK39-00029-0004 is listed for use with the \*\*Life Fitness R9 upright bike\*\*. Its stated application is as an extrusion associated with that exercise bike model.

This product is intended for buyers who need a replacement part for Life Fitness fitness equipment, including gyms, commercial fitness facilities, repair businesses, and private owners maintaining an R9 upright bike. Because the product page does not provide a broader compatibility list, do not assume that it fits other Life Fitness bikes or different equipment models without confirming the part number.

## Why Choose This Product

This part may be a practical choice when your repair requires the specific \*\*AK39-00029-0004\*\* extrusion. The clearly listed brand, equipment model, product name, SKU, and part number make it easier to compare the item with your maintenance documentation or the original component.

Using the exact product identification can help simplify parts research and support more accurate ordering for a Life Fitness R9 upright bike repair.

## Before You Buy

Confirm that your equipment is a \*\*Life Fitness R9 upright bike\*\* and compare the original part with part number \*\*AK39-00029-0004\*\* and SKU \*\*MX423\*\* before ordering. The product information provided does not include dimensions, material, color, installation instructions, package quantity, warranty details, or compatibility with other models. Verify those details if they are important for your repair.

\*\*Brand:\*\* Life Fitness  
\*\*Product:\*\* R9 Upright Bike Extrusion  
\*\*Part Number:\*\* AK39-00029-0004  
\*\*SKU/Product ID:\*\* MX423  
\*\*Compatible Equipment:\*\* Life Fitness R9 Upright Bike  
\*\*Serial Number Reference:\*\* CEI103395

## Details

- **Price:** 79.99 USD
- **Vendor:** Life Fitness
- **Type:** Miscellaneous
- **Tags:** All

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 79.99 USD | In stock |

## Images

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## Additional Information

- **Condition:** PREOWNED

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> Source: [Cardio Equipment Parts](https://www.cardioequipmentparts.com/products/life-fitness-r9-upright-bike-extrusion-ak39-00029-0004-mx423)
> Updated: 2026-08-29