Nitro 591 SC 2006 vs Nitro 640 LX 2004 - Boat Spec Comparison

Q: Which is easier to trailer — the Nitro 591 SC 2006 or the Nitro 640 LX 2004?

For trailering, the Nitro 591 SC 2006 has the edge at 155 lbs dry weight versus 1 092 lbs for the Nitro 640 LX 2004. Add a motor (typically 300–500 lbs for an outboard in this class), gear, and a partial fuel load and the difference grows. Lighter is friendlier on smaller tow vehicles and on fuel economy while hauling.

Q: Which boat can handle a bigger outboard?

The Nitro 591 SC 2006 is rated to a maximum of 200 hp, giving it the larger power ceiling. The Nitro 640 LX 2004 tops out at 90 hp. Keep in mind that maximum ratings are just that — matching the motor to the actual load and usage pattern usually matters more than chasing the ceiling.

Q: How many people can each boat hold?

The Nitro 591 SC 2006 is Coast Guard rated for 4 passengers, while the Nitro 640 LX 2004 is certified for 4. Note that legal capacity and comfortable capacity aren't always the same thing — on a full day out, most experienced boaters aim for about 80% of the rated number to keep things comfortable.

Q: Which boat is wider, and does it affect trailering?

The Nitro 591 SC 2006 measures 94" wide, compared to 84" for the Nitro 640 LX 2004. The US standard-width towing limit is 8’6" (102") in most states — anything over that may need a wide-load permit. Confirm your specific route requirements with each state's DOT.

Q: Which boat has the larger fuel tank — the Nitro 591 SC 2006 or the Nitro 640 LX 2004?

The Nitro 591 SC 2006 has the bigger tank at 43 gallons, versus 24 gallons on the Nitro 640 LX 2004. That 19-gallon difference translates to roughly 57–95 nautical miles of additional range at cruising speed, depending on motor, load, and conditions.

Q: Are the Nitro 591 SC 2006 and Nitro 640 LX 2004 from the same manufacturer?

Yes — both the Nitro 591 SC 2006 and the Nitro 640 LX 2004 are built by Nitro. That means shared dealer networks, common parts availability, and consistent build quality across the line. The choice between them is essentially a question of how much boat you need, not which brand you trust.

Boat Comparison

Nitro 591 SC 2006 vs Nitro 640 LX 2004

Nitro

Nitro 591 SC 2006

2006

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Nitro

Nitro 640 LX 2004

2004

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Detailed Evaluation & Buyer Recommendation

Nitro 591 SC 2006 vs Nitro 640 LX 2004 — Same Brand, Different Boat

The Nitro 591 SC 2006 vs Nitro 640 LX 2004 comparison sits squarely in the category of decisions where specs alone won't tell the whole story — intended use, storage, and long-term ownership costs all factor in.

The power gap is worth calling out. Rated to 200 hp, the Nitro 591 SC 2006 has a 110-hp advantage over the Nitro 640 LX 2004's 90-hp ceiling — enough to notice on acceleration and at cruising speed, particularly with a full passenger load. Fuel capacity breaks the other way: the Nitro 591 SC 2006 carries 43 gallons versus 24 gallons in the Nitro 640 LX 2004. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.

Both boats are rated for 4 passengers — a good fit for a family of four or five plus guests. Comfort at capacity is another matter; the longer hull typically means more seat options and better weight distribution.

Bottom line: Performance buyers should lean toward the Nitro 591 SC 2006 and its 200-hp ceiling. If fuel economy and quieter running matter more than top-end speed, the Nitro 640 LX 2004 with its 90-hp rating is the more economical daily driver.

General Boat Info

MakeNitro

Model591 SC

Model640 LX

Model Year2006

Model Year2004

Measurements / Dimensions

Beam94 in

Beam84 in

Beam - Meters2.39

Beam - Meters2.13

Beam - Inches94

Beam - Inches84

Weight - Detail1,550 lbs

Weight - Detail1092 lbs

Weight - kg703.07

Weight - kg495.32

Weight - lbs.155

Weight - lbs.1092

Height [transom]22 in

Height [transom]21.5 in

Length - Feet18

Length - Feetnot available

Length - Inches7

Length - Inchesnot available

Length overall - Detail18 ft. 7 in

Length overall - Detail16 ft. 4 in

Length overall - Meters5.66

Length overall - Meters4.98

Length overall - Inches223

Length overall - Inches196

Engine and Drivetrain

Engine/s standardMercury? 135 OptiMax?

Engine/s standardnot available

Fuel tank capacity - Detail43 gal

Fuel tank capacity - Detail24 Gallons

Fuel tank capacity - Liters162.77

Fuel tank capacity - Liters90.85

Fuel tank capacity - Gal43

Fuel tank capacity - Gal24

Drive typeOutboard

Drive typenot available

Engine max200 hp

Engine max90 hp

Operational Info

Maximum capacity1,550 lbs

Maximum capacity1080 lbs

Maximum people4

Trailer Info

Trailer - DetailNITRO? color-coordinated single axle drive-on

Trailer - Detailnot available

Trailer - Length over allWith Transom Saver: 25 ft. 0 in. Without Transom Saver: 23 ft. 4 in

Trailer - Length over allnot available

Trailer - Weight3,180 lbs

Trailer - Weightnot available

Trailer - Width8 ft.6 in

Trailer - Widthnot available

Nitro 591 SC 2006 vs Nitro 640 LX 2004 — Common Questions

Which is easier to trailer — the Nitro 591 SC 2006 or the Nitro 640 LX 2004?

For trailering, the Nitro 591 SC 2006 has the edge at 155 lbs dry weight versus 1 092 lbs for the Nitro 640 LX 2004. Add a motor (typically 300–500 lbs for an outboard in this class), gear, and a partial fuel load and the difference grows. Lighter is friendlier on smaller tow vehicles and on fuel economy while hauling.

Which boat can handle a bigger outboard?

The Nitro 591 SC 2006 is rated to a maximum of 200 hp, giving it the larger power ceiling. The Nitro 640 LX 2004 tops out at 90 hp. Keep in mind that maximum ratings are just that — matching the motor to the actual load and usage pattern usually matters more than chasing the ceiling.

How many people can each boat hold?

The Nitro 591 SC 2006 is Coast Guard rated for 4 passengers, while the Nitro 640 LX 2004 is certified for 4. Note that legal capacity and comfortable capacity aren't always the same thing — on a full day out, most experienced boaters aim for about 80% of the rated number to keep things comfortable.

Which boat is wider, and does it affect trailering?

The Nitro 591 SC 2006 measures 94" wide, compared to 84" for the Nitro 640 LX 2004. The US standard-width towing limit is 8’6" (102") in most states — anything over that may need a wide-load permit. Confirm your specific route requirements with each state's DOT.

Which boat has the larger fuel tank — the Nitro 591 SC 2006 or the Nitro 640 LX 2004?

The Nitro 591 SC 2006 has the bigger tank at 43 gallons, versus 24 gallons on the Nitro 640 LX 2004. That 19-gallon difference translates to roughly 57–95 nautical miles of additional range at cruising speed, depending on motor, load, and conditions.

Are the Nitro 591 SC 2006 and Nitro 640 LX 2004 from the same manufacturer?

Yes — both the Nitro 591 SC 2006 and the Nitro 640 LX 2004 are built by Nitro. That means shared dealer networks, common parts availability, and consistent build quality across the line. The choice between them is essentially a question of how much boat you need, not which brand you trust.

← Nitro 591 SC 2006 full specs ← Nitro 640 LX 2004 full specs