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Specifications

 NordicTrack 6.5SiNordicTrack 8.5Si 
NordicTrack 6.5Si TreadmillNordicTrack 8.5Si Treadmill
Product Weight200lbs250lbs
Dimensions73″ L x 36″ W x 54″ H78.5″ L x 36″ W x 59″ H
Maximum Weight Capacity300lbs300lbs
Tread Belt20″ W x 55″ L20″ W x 60″ L
Speed0-10 mph0-12 mph
Built-in Workout Programs2050
Incline10 degrees12 degrees
Display10″ HD touchscreen10″ HD touchscreen
Design and FeaturesFlexSelect Cushioning
Free 1-year iFit membership
Two storage compartment/ cupholders
Two built-in speakers
Auxiliary audio input
FlexSelect Cushioning
Free 1-year iFit membership
Autobreeze workout fan
Auxiliary music port with 2″ speakers
Storage/FoldabilityFolded Dimensions: 38″ L x 36″ W x 67.5″ HFolded Dimensions: 38″ L x 36″ W x 73″ H
Motor HP2.6 CHP3.5 CHP
Warranty10 years frame
2 years parts
1 year labor
2 years parts & labor
Cost (amazon.com)Check PriceCheck Price

Similarities

Both the NordicTrack 6.5Si and 8.5Si have a similar maximum weight capacity

  • Both treadmills have a maximum weight capacity of 300lbs.

Both offer similar screens

  • Both the 6.5Si and 8.5Si have a 10” HD touchscreen monitor.

Differences

Both treadmills have different product weights

  • The NordicTrack 6.5Si weighs 200lbs, while the NordicTrack 8.5Si is heavier with a weight of 250lbs.

Both have different dimensions

  • The NordicTrack 6.5Si has a length of 73”, a width of 36”, and a height of 54”.
  • The NordicTrack 8.5Si has a length of 78.5”, a width of 36”, and a height of 59”.

The NordicTrack 6.5Si and 8.5Si have different tread belt sizes

  • The NordicTrack 6.5Si’s tread belt is 20” wide x 55” long, while the 8.5Si’s tread belt is 20” wide x 60” long.

 Both treadmills slightly differ in maximum speed

  • The NordicTrack 6.5Si has a speed range of 0 to 10mph, while the 8.5Si can go up to 12mph.

Both the NordicTrack 6.5Si and 8.5Si have different numbers of built-in workout programs

  • The NordicTrack 6.5Si has 20 built-in workout programs, while the NordicTrack 8.5Si has more with 50 workout programs.

Both treadmills have different incline angles

  • The NordicTrack 6.5Si has up to 10 degrees incline, while the 8.5Si has up to 12 degrees incline rate.

Both treadmills offer different design and features

  • The NordicTrack 6.5Si has FlexSelect cushioning. It features two storage compartments/cup holders, two built-in speakers, and an auxiliary audio input. It also comes with a free 1-year iFit membership.
  • The 8.5Si comes with a FlexSelect cushioning featuring a cooling fan and auxiliary music ports with 2” speakers. It also has a free 1-year iFit membership.

Both treadmills have different folded dimensions

  • The NordicTrack 6.5Si has dimensions of 38” length, 36” width, and 67.5” height.
  • The 8.5Si has dimensions of 38” length, 36.5” width, and 73” height.

Both the NordicTrack 6.5Si and 8.5Si have different motor power ratings

  • The 6.5Si has 2.6 CHP, while the 8.5Si has 3.5 CHP.

Both treadmills have different warranties

  • The NordicTrack 6.5Si has a 10-year warranty for the frame, two years for parts, and one year for labor.
  • The 8.5Si has a two-year warranty for parts and labor.

Conclusion

The NordicTrack 6.5Si and 8.5Si are both good and stable treadmills. Both models are quite different, and choosing between the two would depend on your preferences.

Here are some of their notable differences you might want to consider:

  • The NordicTrack 6.5Si takes up less space than the 8.5Si.
  • The NordicTrack 8.5Si has more built-in workout programs to choose from than the 6.5Si.
  • The 6.5Si has a better frame warranty.

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