The Nitro 591 2007 vs Nitro Bay 1800 2005 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.
On paper these two are close siblings in the size department — Nitro 591 2007 at 18,0 ft versus Nitro Bay 1800 2005 at 17,0 ft. At 155 lbs and 99 lbs respectively, both sit in a similar weight class — either should pair comfortably with most mid-size SUVs and half-ton trucks, though always confirm your specific tow rating with the motor added.
The power gap is worth calling out. Rated to 200 hp, the Nitro 591 2007 has a 110-hp advantage over the Nitro Bay 1800 2005'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 2007 carries 43 gallons versus 35 gallons in the Nitro Bay 1800 2005. On a lake day that's negligible, but for coastal cruising or long reservoir runs the extra range matters.
For family outings this is probably the sharpest distinction between the two. The Nitro Bay 1800 2005 is rated for 5 passengers, while the Nitro 591 2007 caps at 4. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Nitro Bay 1800 2005 could be the deciding factor.
At this size, power-to-weight ratio matters more than outright horsepower. The Nitro 591 2007 comes in at 1 lbs per hp versus 1 lbs per hp for the Nitro Bay 1800 2005. The lower the ratio the more explosive the acceleration — meaningful on a short RIB where bursts of speed, quick planing, and agility in surf or tight waterways define the experience.
Bottom line: Choose the Nitro Bay 1800 2005 if your priority is putting more people on the water — it handles 5 passengers and at 17,0 ft it has the deck room to back that rating up comfortably. The Nitro 591 2007 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 4 that costs less to run day-to-day.