SB Fitness Equipment CT550

$2,295 list per the Amazon From-the-Brand comparison-table column (B0D15LFWNJ) and the brand-direct Shopify storefront ($2,195 sale / $2,995 compare-at). Amazon and brand-direct prices typically track within $100; brand-direct ships freight curbside and offers the same warranty matrix.

Amazon star rating per the CT250 page's From-the-Brand comparison-table column: 4.6 / 5 stars across 5 ratings. Statistically meaningless at n=5.

350 lbs per the official SB Fitness CT550 Shopify spec and the Amazon From-the-Brand comparison-table column. Stay well under that target on curved-belt decks; foot strike transmits directly to the slats. 100 lbs more capacity than the CT250 (250 lbs) reflects the heavier steel frame and the rubber-slat upgrade.

Manual drive — bounded by stride length and how far forward you step on the curve, not by a motor cap. The manufacturer positions the CT550 for "explosive sprints and intense HIIT," which puts the practical ceiling well above the CT250's walking-only range. No published max-speed number on the spec sheet (none would be meaningful — manual mills don't have one).

Curved deck provides natural variable incline — the front of the curve is steeper than the apex, and stride position controls effective grade. No adjustable incline mechanism (none needed for the curved format).

Raised anti-skid rubber slats on a steel frame — a CT550-specific upgrade over the CT250's flexible-only nylon/fiberglass slats. The Amazon From-the-Brand comparison-table actually drops the CT250's "Flexible, shock-absorbing slats" checkmark for the CT550 in favor of the "raised anti-skid rubber track" framing in the Shopify body — interpretation: the CT550 swaps the flex-slat shock approach for a rubber-grip shock approach, both legitimate, neither in the same league as Walkolution's TheraFloor layer.

2 — far below the CT250's 7 despite the genuinely detachable handrails. The detachable rails are the only thing keeping it off the viability-0 gym floor (CT400/CT700/CT850); everything else says "wrong tool for a desk." Reasoning:

1. 11" step-up height — vs the CT250's 7.5". Materially harder to use under most standing desks without raising the leg feet. The 5-star CT250 reviewer specifically flagged 7.5" as the threshold; another 3.5" stacks on top.
2. Sprint-tier geometry — 350 lb capacity, 8 magnetic resistance levels, "explosive sprints and intense HIIT" lead marketing. The Amazon From-the-Brand comparison table has the CT550 under "Long Distances ✓ / Sprinting ✓ / Walking Only ✗" — the manufacturer is explicit that this is not the walking-only model. CT250 owns that lane.

Not measured by the manufacturer. Manual curved treadmills are quieter than motorized pads (no motor hum) but the slat-on-roller mechanism produces a low rolling sound that grows louder at sprint speeds. Expect noticeably louder than the Walkolution 2 (sub-34 dB) but quieter than most electric walking pads.

62" L x 20" W running surface — meaningfully longer and slightly wider than the CT250's 50" x 16". Comparable to the TrueForm Trainer (60" x 17") and adequate for taller users; 20" of width is generous for confident curved-belt walking.

N/A — no motor, no drive belt, no lubrication schedule. The slat-on-roller surface is the only wear item.

None. Console is a backlit LCD showing distance, speed, time, calories, total miles. No Bluetooth, no companion app.

A "fitness-store" curved manual built for a wider speed range than a walking pad: deep concave deck, nylon/fiberglass/rubber composite slats over a steel frame, 8 magnetic resistance levels for HIIT-style lean-back braking, and a backlit LCD that reads speed/distance/time/calories/total miles. Step forward to accelerate, lean back into the magnets to slow, stop walking and the belt stops. No motor, no electricity, no drive belt to lubricate. Step-up height is 11" — materially taller than the CT250's 7.5" — which is the gotcha for desk-walking buyers: most standing desks can accommodate it, but only after raising the leg feet.

Steel frame with welded handrails (detachable), nylon/fiberglass/rubber composite running slats, high-speed nylon ball bearings (stainless steel bearings only appear on CT700+), magnetic resistance brake assembly. Assembled dimensions 70" L x 34" W x 57" H; unit weight 181 lbs (vs CT250's 92 lbs — the heavier frame is the trade you make for sprint-grade capacity).