# Cardiostrong TX90 CST-TX90-2 Treadmill Speed Control Switch (KP139)

\## Cardiostrong TX90 Treadmill Speed Control Switch KP139

The Cardiostrong TX90 CST-TX90-2 Treadmill Speed Control Switch (KP139) is a replacement key pad component for controlling speed on a compatible Cardiostrong treadmill. If the original speed control switch has become worn, damaged, or no longer performs as expected, this part may help restore the treadmill’s speed-control function without replacing the entire machine. It is intended for customers, fitness equipment technicians, and repair specialists working with the Cardiostrong TX90 treadmill.

## Product Details and Benefits

This product is a treadmill speed control switch, also described as a key pad component. It provides the user interface used to adjust treadmill speed on the compatible equipment. The part is identified by the product name \*\*Cardiostrong TX90 CST-TX90-2 Treadmill Speed Control Switch\*\* and the part number \*\*KP139\*\*.

Each part has been inspected by skilled technicians before sale. This inspection helps confirm the part’s condition and supports safe, practical use as a replacement fitness-equipment component. Reusing a tested treadmill part can also reduce repair costs compared with replacing a complete treadmill console or machine, depending on the fault being repaired.

The component forms part of the treadmill’s control system. Replacing only the faulty switch can help a technician address a specific control issue while keeping the rest of the treadmill in service. This approach can extend the usable life of the equipment and reduce unnecessary waste.

The listing is for one specific replacement component. No additional specifications, such as dimensions, color, material, or installation hardware, are provided. Installation should be completed by someone familiar with treadmill repair and electrical or console components.

## Compatibility and Applications

The KP139 speed control switch is listed for the following equipment:

\- \*\*Brand:\*\* Cardiostrong  
\- \*\*Treadmill model:\*\* TX90  
\- \*\*Model reference:\*\* CST-TX90-2  
\- \*\*Part number:\*\* KP139  
\- \*\*Category:\*\* Key Pads  
\- \*\*Equipment type:\*\* Treadmill

This part is designed for the speed-control function on the specified Cardiostrong TX90 treadmill. It should not be assumed to fit other Cardiostrong treadmills or different brands without confirming the model and part details first. Use it when repairing or replacing the original speed control switch on a compatible TX90 unit.

\## Why Choose This Replacement Part

A matching replacement switch can provide a more focused repair than replacing a complete treadmill control assembly. The inspected component may suit a repair project where the original switch has failed or requires replacement. Choosing a used fitness part can also support component reuse and help keep serviceable equipment out of landfills.

The product page notes that stock may include parts with slight visual differences. These differences may occur because multiple units are held in inventory. The seller states that the supplied item will remain the exact model and part type listed.

## Before You Buy

Confirm that your treadmill is a \*\*Cardiostrong TX90\*\* with the model reference \*\*CST-TX90-2\*\*. Check the existing component for the \*\*KP139\*\* part number where possible. Compare the switch and key pad with the listing details before ordering, especially if appearance matters for your repair. Product images are provided for reference, so the part received may look slightly different while still matching the listed model and component type.

## Details

- **Price:** 79.99 USD
- **Vendor:** Cardiostrong
- **Type:** Key Pads
- **Tags:** All

## Variants

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

## Images

- KP139
- KP139
- KP139
- KP139
- KP139

## Additional Information

- **Condition:** PREOWNED

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> Source: [Cardio Equipment Parts](https://www.cardioequipmentparts.com/products/cardiostrong-tx90-cst-tx90-2-treadmill-speed-control-switch-kp139)
> Updated: 2026-08-28