Choosing the right rowing machine can make a big difference in your training experience. Dynamic Fluid Fitness offers four high-quality rowers — the S660 Forge, S680 Timber, M350, and M550 — each built for different environments, user needs, and performance preferences.
This guide breaks down the key differences between all four models so you can choose the best fit for your home gym, studio, or commercial facility — without bouncing back and forth between product pages.
Overview: How the Models Compare
Dynamic Fluid rowers fall into two clear categories:
-
The S-Series (home & light commercial / 5 resistance levels)
- S660 Forge — Steel + aluminum frame, elevated seat, full commercial
- S680 Timber — American ash wood frame, residential & light commercial
-
The M-Series (commercial / 10 resistance levels)
- M350 — Compact commercial rower with ergonomic “office chair” height seat
- M550 — Rugged commercial unit with side-mounted tank and shorter length
Quick Comparison Table
| Model | Resistance | Frame | Weight | Dimensions (L × W × H) | Application |
|---|---|---|---|---|---|
| S660 Forge | 5 levels | Steel & aluminum | 86.29 lbs | 85.04" × 20.47" × 26.77" | Full commercial |
| S680 Timber | 5 levels | American ash wood | 62.52 lbs | 83.86" × 20.47" × 21.46" | Residential / light commercial |
| M350 | 10 levels | Steel & aluminum | 110.23 lbs | 83.46" × 31.89" × 39.96" | Full commercial |
| M550 | 10 levels | Steel & aluminum | 136.47 lbs | 76.77" × 31.89" × 33.86" | Full commercial |
S660 Forge
S680 Timber
M350
M550
Shared Features Across All Models
All four Dynamic Fluid rowers include:
- Twin Tank Fluid Resistance for smooth, natural water resistance
- Bluetooth auto-adjust performance monitor for connected tracking
- Training metrics including time, speed, distance, stroke rate, watts, and more
- Heart rate receiver compatibility
- Durable belt drive with active recoil system
- Vertical storage capability
- Transport wheels for easier movement
Model-by-Model Breakdown
S660 Forge Rower
The Dynamic Fluid Fitness S660 Forge Rower is engineered for demanding environments. Its steel and aluminum construction and elevated height make it a strong fit for commercial spaces where durability matters.
Key reasons to choose the S660:
- Steel & aluminum frame built for long-term use
- Elevated height for easier access (great for tall users and rehab settings)
- Rated for full commercial use
- 15% greater resistance from the updated impeller design
- Vertical storage and transport wheels to save space
Notable differences: Compared to the S680, the S660 is heavier, taller, and rated for full commercial use with a steel & aluminum frame.
S680 Timber Rower
The Dynamic Fluid Fitness S680 Timber Rower pairs a smooth rowing feel with an eye-catching frame made from American ash wood. It’s low maintenance, space-efficient, and ideal for home and light commercial settings.
Key reasons to choose the S680:
- American ash wood frame for a premium look
- Lightest model in the lineup for easier repositioning
- Ideal for residential & light commercial use
- 15% greater resistance from the updated impeller design
- Vertical storage and transport wheels for space savings
Notable differences: Compared to the S660, the S680 is lighter, slightly shorter, and designed for home / light commercial use with a wood frame aesthetic.
M350 Rower
The Dynamic Fluid Fitness M350 Rower is a compact, commercial-grade rower with a natural catch and smooth feel. It features a 10-level adjustable Twin Tank system and an ergonomic layout that works well for a wide range of users.
Key reasons to choose the M350:
- 10 resistance levels (more range than the S-series)
- Commercial-grade build with steel & aluminum construction
- Compact footprint with vertical storage
- “Office chair” height seat for easy access
- Air Glide concealed seat rollers for a smooth, clean ride
Notable differences: Compared to the S660/S680, the M350 offers more resistance levels and a more commercial-focused configuration with a wider stance.
M550 Rower
The Dynamic Fluid Fitness M550 Rower is built for performance in demanding gym environments. Its shorter length, rugged frame, and side-mounted Twin Tank design deliver a premium rowing experience while minimizing floor space.
Key reasons to choose the M550:
- Shortest length in the lineup for tighter spaces
- Heaviest and most stable build for high-volume use
- 10 resistance levels to suit all fitness levels
- Side-mounted tank for easy access and a unique design
- Air glide concealed seat rollers for a smooth, clean ride
Notable differences: Compared to the M350, the M550 is shorter, heavier, and built as a more rugged option with a distinctive side-tank layout.
Which Dynamic Fluid Rower Should You Choose?
Choose the S660 Forge if you want:
- Elevated height for easier entry and exit
- Full commercial durability
- A premium black steel/aluminum frame
Choose the S680 Timber if you want:
- A warm, premium wood aesthetic
- A lighter frame for easier mobility
- Home or light-commercial use
Choose the M350 if you want:
- 10 levels of resistance for more training variety
- A compact commercial rower with an accessible seat height
- Great versatility for HIIT and longer steady sessions
Choose the M550 if you want:
- The most rugged, stable build for high-volume use
- A shorter length for space efficiency
- A distinctive side-mounted tank design and premium rail construction
Want to explore each model in more detail?
View the S660 Forge, S680 Timber, M350, or M550 rower product pages to see full specs, pricing, and availability.
Final Thoughts
All four Dynamic Fluid Fitness rowers deliver smooth Twin Tank water resistance, connected performance tracking, and durable construction. The best choice comes down to your preferred environment (home vs commercial), desired resistance range (5 vs 10 levels), and design preferences (wood vs steel/aluminum).
If you’d like help choosing the best model for your space and training goals, feel free to contact our team — we’re happy to help.