SB Fitness Equipment
SB Fitness CT400 Curved Manual Treadmill
LiftEvidence pick: Best Manual Curved
A self-powered curved treadmill with no top speed, for sprints and HIIT
- Best for
- Sprint and HIIT training, athletes, and garages without convenient power.
- Skip if
- Long, easy runs or incline walking — curved treadmills are hard work at every pace.
- For less
- ProForm Carbon TLX (mid-range) — 12 mph and 12% incline with strong owner feedback, under $900
SB Fitness Equipment
Manual curved
Not reliably published
Amazon customer rating
4.3/5 from 60 ratings
Checked October 7, 2026
- Motor
- None (self-powered)
- Running deck
- Not reliably published
- LiftEvidence score
- 7.2 / 10
- Price band
- Premium
Affiliate link: LiftEvidence may earn a commission at no extra cost to you. Prices and availability are shown on Amazon. Disclosure
Quick verdict
LiftEvidence editorial assessment
A non-motorised curved treadmill that you power yourself, with no top speed, three resistance levels, flexible slats for shock absorption and a basic display. Curved treadmills respond instantly to your effort, which makes them excellent for sprints and intervals and demanding for steady running. It has no incline, needs no power, and owner evidence is limited to 60 ratings.
Specifications
Source: manufacturer listing
As stated by the manufacturer (website or Amazon listing; conflicts are noted). Information that was not available or could not be confirmed is omitted or marked “Not reliably published”.
- Brand
- SB Fitness Equipment
- Model
- CT400
- ASIN
- B08NK8YZJT
- Type
- Manual curved
- Motor
- None (self-powered)
- Incline
- None
- Decline
- None
- Running deck
- Not reliably published
- Cushioning
- Flexible track slats
- Folds
- No
- Dimensions
- 72 × 31 × 62 in (L × W × H)
- Machine weight
- 145 lb
- Display & connectivity
- Digital: time, distance, speed, calories
- Subscription
- None
Sources: Amazon.com listing. Checked October 7, 2026.
Who it suits
LiftEvidence editorial assessment
Best suited to
- Sprints & HIIT
- Serious Running
Sprint and HIIT training, athletes, and garages without convenient power.
Less suitable for
Long, easy runs or incline walking — curved treadmills are hard work at every pace.
Strengths and drawbacks
LiftEvidence editorial assessment
Strengths
- No top speed, instant response
- No electricity needed
- Great for sprints and intervals
- Quiet — no motor
Drawbacks
- Demanding for steady runs
- No incline
- Deck size and user capacity not published on the listing
- Only 60 ratings
Running, stability and durability
LiftEvidence editorial assessment
Our interpretation of the specifications, stated construction and recurring customer feedback. We have not independently tested this product.
- Running
- Good
- Walking
- Moderate
- Stability
- Excellent
- Quietness
- Excellent
- Build quality
- Good
- Durability
- Good
Evidence and product claims
Scientific evidence, independent testing and manufacturer claims are different kinds of information and are not equivalent.
Independent testing
No independent laboratory testing of this model identified.
Manufacturer claims
Burns more calories than a traditional treadmill; no maximum speed (manufacturer listing).
Marketing statements; not independently verified.
Customer feedback
Source: Amazon customer reviews · checked October 7, 2026
Amazon customer rating
4.3/5 from 60 ratings
Checked October 7, 2026
Customer ratings reflect user experience on Amazon. They are not LiftEvidence ratings and are not controlled evidence.
Recurring themes
Owners find it solidly built for the price, easy to assemble and use, and smooth and durable; one says it eases knee pressure, another calls it a massive cardio workout.
Commonly praised
- Solid build for the price
- Smooth
- Hard workout
Editorial scores
LiftEvidence editorial assessment · 0–10
7.2/ 10 · LiftEvidence score (weighted)
- Running performance · 25%
- 8.0
- Build & durability · 20%
- 8.0
- Deck & cushioning · 15%
- 6.5
- Training features · 10%
- 5.0
- Home practicality · 10%
- 8.0
- Warranty & support · 10%
- 6.0
- Value · 10%
- 7.0
Editorial judgements from the manufacturer's specifications, stated construction and recurring customer-review themes, using the same criteria for every product in this category. They are not measurements, and we have not tested this product. How we evaluate
Compare with other treadmills
- Horizon 7.4 AT
Folding motorised · 3.5 CHP (continuous duty) · 22 × 60 in
- NordicTrack Commercial 1750
Folding motorised · Not reliably published · Not reliably published
- ProForm Carbon TLX
Folding motorised · Not reliably published · Not reliably published
- Horizon 7.0 AT
Folding motorised · Not reliably published · 20 × 60 in
- Sunny Excel Smart
Folding motorised · 4 HP peak · 20 × 55 in
- NordicTrack T 6.5 S
Folding motorised · Not reliably published · Not reliably published
- Sunny Fully Assembled
Compact / walking · 2.5 HP brushless · 20 × 53 in
Where to check the price
LiftEvidence is not the seller. These links lead to the Amazon listing for this model; availability differs by country.
SB Fitness CT400
Check price on Amazon