SB Fitness Equipment
SB Fitness CT400 Self Generated Curved Treadmill
SB Fitness CT400 Self Generated Curved Treadmill
4.79 / 5.0
(28) 28 total reviews
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Best Value Curved Treadmill for home gyms, walking, jogging, and joint-friendly training.
Best for: Home gym owners, seniors, users with joint concerns, personal trainers, and anyone seeking an affordable, versatile curved treadmill that balances comfort and intensity.
Awarded “Best Value Curved Treadmill” by Healthline, “Best Budget Curved Treadmill” by Active.com and Greatist, and “Best for At Home Walker” by RunToTheFinish.
The CT400 delivers a smarter, more effective workout than traditional motorized treadmills. Its innovative flexible shock-absorbing slats and nylon track bearings provide excellent cushioning while naturally increasing muscle engagement — especially in the calves and thighs. With 3 levels of magnetic resistance, you can easily adjust intensity for walking, power walking, jogging, or HIIT intervals.
Self-powered and maintenance-free, the CT400 requires no electricity and has no maximum speed limit. It’s the ideal entry point into curved treadmills for most home users.
Compare All SB Fitness Curved Treadmills →
Key Features & Benefits
- Flexible shock-absorbing slats + nylon bearings — Natural resistance for deeper muscle activation with excellent joint cushioning
- 3 Magnetic Resistance Levels (Low / Medium / High) — Shortens learning curve and lets you control pace and intensity
- Lightweight & compact — Easy to move with built-in transport wheels and handles
- No electricity required — Use anywhere; zero utility costs
- Durable construction — Steel frame, ultra-thin slats rated for 150,000 miles
Advantages of Curved Treadmills (like the CT400) vs Motorized Models
- Higher calorie burn and muscle activation
- Promotes better running form and natural cadence
- Immediate speed adjustment — perfect for HIIT and intervals
- No motor or expensive electronics to fail
- Greater reliability and longer service life
Detailed Specifications
| Specification | Details |
|---|---|
| Assembled Dimensions (L x W x H) | 73" x 30.5" x 61.6" |
| Running Surface | 18" W x 60" L |
| Product Weight | 165 lbs |
| Max User Weight | 300 lbs |
| Step-Up Height | 12" |
| Track Bearings | Nylon (natural resistance) |
| Slats | Flexible shock-absorbing slats |
| Resistance Levels | 3 magnetic (Low / Medium / High) |
| Console | Digital display (time, speed, distance, calories). Set time/distance goals. |
| Transport Features | Built-in wheels + transport handles |
| Leveling Feet | Yes |
| Electricity Required | None |
| Warranty (Residential) | Frame: 10 years / Parts: 5 years / Console: 2 years / Labor: 1 year |
| Warranty (Commercial) | Frame: 5 years / Parts: 3 years / Console: 2 years / Labor: 1 year |
Commercial Suitability: Light use.
Safety Features
- Operator-controlled start/stop using the curve of the treadmill and gravity
- High-tension resistance helps slow and stop movement
- Rear upward curve assists in immediate stopping
- Full handrails for balance and stability
Why Choose the CT400?
- Outstanding value with proven awards and real-world performance
- Versatile for walking, jogging, and interval training
- Excellent shock absorption with added muscle engagement
- Simple, reliable design that’s easy to own and maintain
Common Questions
Is the CT400 good for running or sprinting? It excels at walking, power walking, and jogging. The natural resistance makes longer runs or high-speed sprinting more fatiguing than on our higher-end models (CT700/CT850).
How does it compare to other curved treadmills? See our full comparison in the buying guide.
Shipping & Assembly? Professional curbside freight. Clear instructions included; most users assemble within an hour. In-home setup available in many areas via 3rd party contractor. Contact for quote and availability.
Financing? Flexible options at checkout.
Ready to elevate your workouts? Add the CT400 to your cart today or reach out with any questions — our team is here to help.
Shipping & Returns We offer curbside freight shipping on all treadmills with clear delivery scheduling. See full details in our Shipping Policy.
We want you to be confident in your purchase. If the treadmill isn’t the perfect fit, you have 30 days to return it. See our Return Policy for complete details, including our fair restocking policy for unopened items.
Questions about shipping, assembly, or returns? Contact us anytime at sales@sbfitnessequipment.com — we’re happy to help.
Browse All Curved Treadmills → Full Treadmill Buying Guide →
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Satisfaction Guaranteed
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Its was easy to assemble, and its conveniently light to move in and out of the house . The firs 10 miles on this thing were not smooth. You need the steadyness of a mountain goat to run on this thing. The belt is aligned and centered but it bounces from resistance to free fall randomly. The brands i use at the gym are not this janky
Awesome treadmill.
I purchased a CT400 and had some issues with the bolts that attach the uprights to the frame. I was concerned with the stripping of the bolts, so I send a voicemail and texts with Brant. I am pleased to say that the response was timely and professional. I was assure that the treadmill would be replaced if damage was done to the lugs if forced. I did receive 3 extra bolts to replace the ones that stripped, and I was able to finish the assembly of the unit. Thank you for the timely attention and follow thru on resolving the issue. I appreciate that. I would recommend this particular treadmill .
Great work horse!! Shipping and customet service excellent! Price paid very reasonable compared to competion, much better deal! Well made machine.
Iveta
I developed a lot of muscle atrophy after I dislocated both knees, developed arthritis n both knees also. I hate feeling that I missed a step but since I got this treadmill my life has benefitted from it. My endurance has increased, I’ve lost weight, I feel different and look more fit (well more fit than I was). I also developed lower back problems from my bad knees and this treadmill has actually strengthened my core. I do heavy PT at home every other day but this manual treadmill kicks my butt. At first it was difficult but eventually you get a feel for it but you have to try. I started a walking mile of 25 min to an excellent light mile run of 13:45 mins. It wipes me out and gives me a heavy sweat but it is totally worth it, the bounce back of the deck allows me to lightly run whereas I cannot do that in the real. Being on a cane and not being able to run in real was a bummer for me but this treadmill is completely worth it. My roommate saw the progress I was doing and they decided to hop on also, they are still getting use to the treadmill but they say that they are seeing results. Gave me hope of being as close to my norm that I use to be. Love it!
Its was easy to assemble, and its conveniently light to move in and out of the house . The firs 10 miles on this thing were not smooth. You need the steadyness of a mountain goat to run on this thing. The belt is aligned and centered but it bounces from resistance to free fall randomly. The brands i use at the gym are not this janky
Awesome treadmill.
I purchased a CT400 and had some issues with the bolts that attach the uprights to the frame. I was concerned with the stripping of the bolts, so I send a voicemail and texts with Brant. I am pleased to say that the response was timely and professional. I was assure that the treadmill would be replaced if damage was done to the lugs if forced. I did receive 3 extra bolts to replace the ones that stripped, and I was able to finish the assembly of the unit. Thank you for the timely attention and follow thru on resolving the issue. I appreciate that. I would recommend this particular treadmill .
Great work horse!! Shipping and customet service excellent! Price paid very reasonable compared to competion, much better deal! Well made machine.
Iveta
I developed a lot of muscle atrophy after I dislocated both knees, developed arthritis n both knees also. I hate feeling that I missed a step but since I got this treadmill my life has benefitted from it. My endurance has increased, I’ve lost weight, I feel different and look more fit (well more fit than I was). I also developed lower back problems from my bad knees and this treadmill has actually strengthened my core. I do heavy PT at home every other day but this manual treadmill kicks my butt. At first it was difficult but eventually you get a feel for it but you have to try. I started a walking mile of 25 min to an excellent light mile run of 13:45 mins. It wipes me out and gives me a heavy sweat but it is totally worth it, the bounce back of the deck allows me to lightly run whereas I cannot do that in the real. Being on a cane and not being able to run in real was a bummer for me but this treadmill is completely worth it. My roommate saw the progress I was doing and they decided to hop on also, they are still getting use to the treadmill but they say that they are seeing results. Gave me hope of being as close to my norm that I use to be. Love it!