NordicTrack C 2450 vs X24: Which One Should You Buy

Choosing between the NordicTrack C 2450 and the NordicTrack X24i often comes down to one question: how do you prefer to train?

Both machines sit near the top of the NordicTrack treadmill lineup. Each offers a powerful motor, large HD touchscreen, immersive iFIT workouts, and premium construction designed for consistent training. The key difference is how each treadmill approaches training intensity.

The Commercial 2450 is designed for traditional running workouts, supporting faster speeds and moderate incline training that mirrors outdoor terrain. The X24, by contrast, is built for extreme incline workouts that emphasize climbing, hiking-style cardio, and strength-focused training.

If you are deciding between the two, understanding how they differ in incline capability, cushioning design, and overall workout experience can help you choose the treadmill that best supports your training goals.

NordicTrack C 2450 vs X24i at a Glance

Explore NordicTrack 2450 vs X24i specs, including speed, incline, cushioning, and features, to choose the right treadmill for your training style.

Note: iFIT subscription sold separately. Features vary by membership tier.

Key Difference: Running vs Extreme Incline Training

The primary difference between the C 2450 and the X24i is how each machine creates workout intensity.

The C 2450 emphasizes speed and endurance training. It supports faster running workouts, interval sessions, and terrain-style training that mirrors outdoor routes.

The X24i increases workout intensity through incline rather than speed. With the ability to climb up to 40%, the machine allows users to create demanding workouts through sustained uphill effort.

Both machines deliver challenging cardio sessions, but the training style feels very different.

If your workouts revolve around running performance and speed, the C 2450 is typically the better match. If you prefer steep hill workouts or incline-focused training, the X24i offers capabilities that a traditional treadmill cannot replicate.

Incline Range: Moderate Hills vs Extreme Incline Training

One of the biggest differences between the NordicTrack C 2450 and the NordicTrack X24i is the incline range each machine offers. While both treadmills support incline and decline workouts, they are designed for very different types of terrain training.

The C 2450 offers a range from -3% decline to 12% incline. This range is ideal for traditional treadmill training that mimics outdoor running routes. Runners can simulate rolling hills, downhill segments, and moderate climbs while maintaining a natural running stride. The incline range also works well for interval training, endurance runs, and hill workouts that focus on building speed and stamina.

The X24i, by contrast, offers a much wider range of -6% decline to 40% incline. This extreme incline capability is designed for high-intensity uphill training. Steep incline walking and hiking workouts can significantly increase workout intensity without requiring running speeds. Many athletes use incline trainers like the X24i for calorie-focused cardio sessions, strength-focused hill climbs, or hiking-style workouts that challenge the legs and cardiovascular system. A 2012 study published in the Journal of Biomechanics showed that metabolic cost of the participants increased by 17% at 5 percent incline, and 32% at 10 percent incline compared to flat ground.¹

In simple terms, the difference looks like this:

• C 2450: best for running workouts, moderate hill training, and terrain simulation

• X24i: best for steep incline workouts, hiking-style training, and high-intensity hill climbs

If your workouts revolve around running performance, the incline range of the 2450 will feel more natural. If you enjoy intense uphill workouts or want maximum incline capability, the X24i offers a training experience that a traditional treadmill cannot match

Cushioning Comparison: Road Feel vs Trail Simulation

Another important difference between the two machines is the cushioning system built into the running deck.

The C 2450 uses RunFlex cushioning, which is designed to create a running experience similar to outdoor road running while still reducing impact compared to harder surfaces like pavement. This balance between responsiveness and shock absorption helps runners maintain a natural stride during faster workouts such as intervals, tempo runs, and longer endurance sessions.

The X24i uses SpringFlex cushioning, which is tuned for the movement patterns created during steep incline workouts. Incline training often involves slower speeds and sustained climbing efforts similar to hiking or mountain-style workouts.

SpringFlex cushioning is designed to provide a softer feel during these climbing workouts, helping maintain comfort while training at higher incline angles.

In practical terms:

• RunFlex cushioning (C 2450) supports faster running workouts and endurance training

• SpringFlex cushioning (X24i) supports incline walking and climbing-style cardio workouts

Both systems help reduce impact compared to outdoor running surfaces, but they are optimized for different training experiences.

Folding Design: Space-Saving vs Fixed Training Platform

Another important difference between these treadmills is the frame design.

The C 2450 includes a foldable SpaceSaver design, allowing the deck to lift upward when the treadmill is not in use. This can be helpful for home gyms where space is limited or when users prefer to keep their workout area flexible.

The X24i, however, uses a fixed frame design and does not fold. This structure helps support the steep incline angles the treadmill can reach during workouts.

For buyers deciding between the two machines, the difference is straightforward:

• C 2450: folds for easier storage

• X24i: fixed frame built to support extreme incline workouts

If saving space is an important factor in your home gym setup, the folding design of the 2450 may be more convenient. If your priority is incline performance, the X24i's fixed frame supports that style of training.

Workout Experience: Running vs Climbing

Because of their different incline capabilities, the two treadmills create very different training experiences.

The C 2450 supports traditional running workouts such as endurance runs, interval training, and moderate hill sessions. The X24i focuses on steep incline workouts where intensity comes from sustained climbing rather than speed.

Both machines integrate with iFIT trainer-led workouts that automatically adjust speed and incline during guided training sessions.

For example, the Everest: A Trek to Base Camp Series takes users through challenging Himalayan terrain with sustained climbs designed to build endurance and hiking strength. Many workouts in the series feature sustained climbs that exceed 10 percent, with some reaching up to 40 percent on compatible NordicTrack incline trainers like the X24i.

If you want to experience immersive mountain-style workouts, explore the Everest: A Trek to Base Camp Series on iFIT.

Note: iFIT subscription sold separately. Features vary by membership tier.

Who Should Choose the C 2450?

The C 2450 is a strong choice for users whose workouts center around running.

This treadmill may be the better option if you want:

• Faster running speeds

• Endurance training workouts

• Interval and tempo running sessions

• Moderate hill workouts that simulate outdoor terrain

• A folding treadmill for home gym flexibility

For runners preparing for races or building long-distance endurance, the C 2450 provides a traditional treadmill experience designed around performance training.

Who Should Choose the X24i?

The X24i is designed for users who want to focus on incline training.

This treadmill may be the better choice if your workouts emphasize:

• Steep incline walking or hiking workouts

• High-intensity hill climbs

• Strength-focused cardio training

• Maximum incline capability for challenging workouts

For athletes who enjoy incline workouts or hiking-style training sessions, the X24i provides capabilities that traditional treadmills cannot match.

C 2450 vs X24i: Which Treadmill Is the Better Choice?

Both treadmills offer premium construction, immersive training features, and powerful motors designed for consistent workouts.

The decision ultimately depends on how you prefer to train.

Choose the C 2450 if your workouts revolve around running performance, endurance training, and interval workouts.

Choose the X24i if you want steep incline workouts that emphasize climbing, strength-focused cardio, and hiking-style training.

Understanding your preferred workout style is the easiest way to determine which treadmill will better support your training goals.

Frequently Asked Questions

What is the difference between the NordicTrack 2450 and X24i?

The C 2450 is designed primarily for running workouts with faster speeds and moderate incline capability. The X24i focuses on extreme incline training for steep hill workouts and climbing-style cardio.

Is the NordicTrack X24i better for incline workouts?

Yes. The X24i supports incline levels up to 40%, which allows for much steeper hill workouts than traditional treadmills.

Can you run on the NordicTrack X24i?

Yes. The X24i supports running speeds up to 12 MPH, although many users primarily use it for incline-focused workouts.

Is the NordicTrack C 2450 good for hill training?

Yes. The C 2450 includes incline capability up to 12% and decline capability down to -3%, allowing runners to incorporate hill workouts and terrain variation.

Which treadmill is better for beginners?

Both machines can support beginner workouts. However, beginners focused on traditional walking or running workouts may find the C 2450 easier to adapt to because it follows a traditional treadmill design.

Reference

1. Journal of Biomechanics. Predicting the metabolic cost of incline walking from muscle activity and walking mechanics.

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