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NordicTrack T 6.5 Si vs NordicTrack T 8.5 S, Main differences

As a treadmill expert who uses different models daily, I’m excited to share my experience with two popular NordicTrack models: the NordicTrack T 6.5 Si and the NordicTrack T 8.5 S. Both treadmills offer unique features catering to various fitness levels and goals. In this comparison, I’ll dive into the main differences to help you decide which model is the best fit for your home gym, but first let see their specs side by side with the table below.

NordicTrack T 6.5 Si

NordicTrack T 8.5 S

NordicTrack T 6.5 Si treadmill NordicTrack T 8.5 S treadmill

NordicTrack T 6.5 Si vs NordicTrack T 8.5 S Specs Comparison

  • Motorized incline with a tilt up to 10% is great
  • The FlexSelect cushioning is great, it helps to protect your joints by absorbing impacts
  • The T 6.5 S is very easy to fold with EasyLift hydraulics
  • Great powerful commercial grade motor
  • Up to 12% easy to control power incline
  • Display size is great
  • Tread belt is 55″ long, it would be nice if it was 60″
  • The 10 MPH top speed is not ideal for serious runners
  • Warranty could be better in this price range
  • There is no chest strap for heart rate monitoring but the EKG grip pulse monitor is working fine
Brand NordicTrack NordicTrack
Model T 6.5 Si T 8.5 S
Motor Power 2.6 HP 3.5 CHP
Speed Range 0 – 10 MPH 0 – 12 MPH
Incline/Decline 10% incline with digital quick incline control 12% incline with digital quick incline control
Folding yes yes
Belt Size 20″ X 55″ 20″ X 60″
Weight Limit 300 lbs. 300 lbs.
Heart Rate Monitor Contact, Dual CardioGrip Heart Rate Monitor, Heart rate chest strap (not included) EKG Grip Pulse
Built-in Programs 20 50
Tablet/Device holder yes yes
Cooling Fan no yes
Display 10″ Smart HD Touchscreen 10″ Interactive HD Touchscreen
Touchscreen yes yes
Handlebar Buttons no no
Audio yes yes
Bluetooth Audio yes yes
Training Apps iFit (30-day free membership included ) iFit (Includes 1-Year NordicTrack iFit membership)
Rollers 1.9″ rollers 1.9″ rollers
Dimensions 74L x 36W x 54H inches 78.9 L x 35.5W x 59.4H inches
  • 10-year on frame
  • 2-year on parts
  • 1-year labor
  • 10-Year Frame Warranty
  • 2-Year Parts Warranty
  • 1-Year Labor Warranty
See Price at Amazon See Price at Amazon
NordicTrack T 6.5 Si treadmill console NordicTrack T 8.5 S treadmill console
NordicTrack T 6.5 Si treadmill frame NordicTrack T 8.5 S treadmill frame

Motor and Speed:

The NordicTrack T 6.5 Si features a 2.6 CHP DurX™ Commercial Plus motor, providing smooth and quiet performance. During my runs on the 6.5 Si, I found the motor capable of handling my daily workouts, reaching speeds of up to 10 mph with ease. This model is ideal for walkers, joggers, and occasional runners.

In contrast, the NordicTrack T 8.5 S boasts a powerful 3.5 CHP DurX™ Commercial Plus motor. When I tested the T 8.5 S, I was impressed by the motor’s ability to handle more intense running sessions, it can reach a top speed of 12 mph. The T 8.5 S is suitable for more serious runners or those looking for a more powerful treadmill for their home gym.

Incline and Cushioning:

One of the features I enjoyed about the NordicTrack T 6.5 Si is its 0-10% incline range, allowing me to add variety to my workouts and target different muscle groups. Moreover, the treadmill’s FlexSelect™ cushioning provided a comfortable running surface that eased the impact on my joints.
On the other hand, the NordicTrack T 8.5 S offers an impressive 0-12% incline range, providing even more options for workout intensity and variety. While running on the T 8.5 S, I appreciated the same FlexSelect™ cushioning that reduced joint stress, making for a more comfortable experience.

Display and Workout Programs:

The NordicTrack T 6.5 Si comes with a 10-inch HD touchscreen display, which I found engaging and visually appealing. With 20 built-in workout programs and access to iFit, I never ran out of workout options and enjoyed the interactive training sessions with personal trainers.

The NordicTrack T 8.5 S, however, steps it up with a larger 14-inch HD touchscreen display. During my time on the T 8.5 S, I found the larger screen more immersive, especially when using iFit’s virtual training sessions. The T 8.5 S also comes with 50 built-in workout programs, giving users a wider range of options to choose from.

Price and Value:

The NordicTrack T 6.5 Si is generally more budget-friendly compared to the T 8.5 S, making it a suitable option for those looking for an affordable yet reliable treadmill. However, if you’re willing to invest more for a powerful motor, increased incline range, and a larger touchscreen, the NordicTrack T 8.5 S might be the right choice for you.

What Customers Say About NordicTrack T 6.5 Si

People generally seem to have positive opinions about the NordicTrack T 6.5 Si treadmill. Many users praised the treadmill for its overall quality, sturdiness, and good shock absorption, which provided a comfortable experience during workouts. They also appreciated the built-in screen and speakers, as well as the one-year iFit membership, which allowed them to track their progress and enjoy personalized workouts.

However, some users pointed out that assembling the treadmill could be challenging, often requiring two people and taking between one to two and a half hours to complete. A few users reported issues with the heart rate sensors and a slight lean on the treadmill, which made folding it up difficult. Moreover, some customers experienced delivery issues and had to reschedule their delivery dates.

Despite these concerns, the NordicTrack T 6.5 Si treadmill appears to be a solid option for home use, providing a reliable and comfortable workout experience.

What Customers Say About NordicTrack T 8.5 S

Customers generally seem to be satisfied with the NordicTrack T 8.5 S treadmill. They appreciate its sturdiness and the fact that it can be easily folded to save space. The iFit feature is a popular aspect, as it offers guided runs and virtual “travel” experiences that make workouts more enjoyable. Some users have found the assembly process a bit challenging, but overall manageable with the help of another person. The treadmill’s cushioning is praised for its comfort during running.

However, there are a few downsides mentioned by customers. Some users have experienced issues with the heart rate monitor and the safety key, while others have found the touchscreen slow to boot up. Additionally, there is disappointment regarding the lack of headphone connectivity for audio, which can make it difficult to hear the iFit audio during workouts. Despite these minor drawbacks, most customers seem to be happy with their purchase and feel the treadmill offers good value for the price.


In summary, both the NordicTrack T 6.5 Si and T 8.5 S are excellent treadmills. The T 6.5 Si offers a great balance of features at a more affordable price, while the T 8.5 S provides enhanced performance and advanced features for a higher investment and it is a bettr option for runners because of its 12 mph top speed.
Side by side images of NordicTrack T 6.5 Si and NordicTrack T 8.5 S treadmills