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Cobalt 255 (2005)
(w/ 1 x 375-hp Volvo Penta 8.1Gi sterndrive)

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Brief Summary

The 255 is a mid-range sportboat with the capability of providing a luxurious escape and a thrilling ride. She also has overnight accommodations for two.

Key Features

  • 10 Year Hull/Deck Warranty
  • 5 Year Powertrain Warranty
  • Composite Transom
  • Fiberglass Stringer System
  • Ignition Safety Switch
  • Kevlar Reinforced Hull
  • Tilt Steering Wheel
  • AM/FM CD Player
  • Porta Potti
  • V-Berth Filler Cushion
  • Extended Swim Platform with Wet Locker
  • Specifications

    Length Overall 25'0''
    Beam 8'6''
    Dry Weight 4,995 lbs
    Tested Weight N/A
    Draft 24''
    - Draft Up N/A
    - Draft Down N/A
    - Air Draft N/A
    Deadrise/Transom 22 deg.
    Max Headroom N/A
    Bridge Clearance 62''
    Weight Capacity N/A
    Person Capacity N/A
    Fuel Capacity 73 gal.
    Water Capacity 10 gal.
    Length on Trailer N/A
    Height on Trailer N/A
    Trailer Weight N/A
    Total Weight
    (Trailer, Boat, & Engine)

    Prices, features, designs, and equipment are subject to change. Please see your local dealer or visit the builder's website for the latest information available on this boat model.

    Engine Options

    Std. Power Not Available
    Tested Power 1 x 375-hp Volvo Penta 8.1Gi sterndrive
    Opt. Power 1 x 300-hp MerCruiser 350 Mag MPI Bravo 1
    1 x 320-hp MerCruiser 6.2 MX MPI Bravo 3
    1 x 425-hp MerCruiser 496 Mag HO Bravo 3
    1 x 320-hp Volvo Penta 5.7 GXi DP
    1 x 420-hp Volvo Penta 8.1 GXi DP

    Test Results - Change Measurement Unit

    RPM MPH Knots GPH MPG NMPG Stat. Mile NM dBa
    625 4.7 4.0 1.1 4.2 3.7 278 242 66
    1000 6.7 5.8 2.2 3.1 2.7 205 178 70
    1500 9.3 8.1 4.1 2.3 2.0 151 131 78
    2000 16.1 14.0 6.1 2.6 2.3 173 151 88
    2500 28.1 24.4 8.0 3.5 3.1 231 201 85
    3000 35.0 30.4 10.8 3.3 2.8 214 186 86
    3500 42.3 36.7 14.9 2.8 2.5 186 162 88
    4000 47.8 41.5 17.9 2.7 2.3 175 152 89
    4500 53.5 46.5 27.5 2.0 1.7 128 111 92
    4600 55.5 48.3 30.3 1.8 1.6 121 105 93
    625 242 447 7.60 4.16 1.80 66
    1000 178 330 10.80 8.33 1.33 70
    1500 131 243 15.00 15.52 0.98 78
    2000 151 278 25.90 23.09 1.12 88
    2500 201 372 45.20 30.28 1.49 85
    3000 186 344 56.30 40.88 1.39 86
    3500 162 299 68.10 56.40 1.21 88
    4000 152 282 76.90 67.76 1.14 89
    4500 111 206 86.10 104.10 0.83 92
    4600 105 195 89.30 114.70 0.78 93

    All fuel consumption numbers are the total for all engines in the boat. Speeds are measured with Stalker ProSports radar gun or GPS. Fuel consumption (gallons per hour) measured with Floscan digital fuel-flow meter or by on-board factory-installed diagnostic instruments. Range is based on 90% of published fuel capacity. Sound levels determined using Radio Shack digital decibel meter on A scale. 68 dBA is the level of normal conversation. Time to plane is measured from start of acceleration to formation of rooster tail behind boat.

    Performance Chart

    Performance Chart

    Acceleration Times & Test Conditions

    Time To Plane 3.9 sec.
    0 to 30 6.9 sec.
    Ratio 1.78:1
    Props Dual F5
    Load 2 pers, 1/2 fuel, no water, min. gear
    Climate 65 deg., 60% humid., wind: 10 knots; seas: 1-2 feet

    Cobalt 255 (2005) Line Drawing


    Captain's Report

    Tested By Capt. Bob SmithCobalt has always built their boats to last and backed it with a warranty with real teeth. In my experience with Cobalt I have seen strong dedication to the customer whether that customer is the dealership, the end user or one of us as testing captains. I have seen enough to know it is more than window dressing and the buyer is the winner.The 255 has docking lights and a scuff plate that help you find the trailer and not tear up the nose getting on it at night. The anchor locker has a very sturdy lid and even has a gas shock to help keep it open while you work with the ground tackle. The forward topside has two stainless rails and a hatch as you travel toward the cockpit. Getting to the bow is up a flip down stainless folding step just inside the cabin at the door. This doesn’t eat up space on the dash and keeps it looking clean. The fold over windshield has a positive latch to keep the window open when you want it.Cockpit FeaturesThe companion side has storage in a slash pocket, cup holder, grab handle and in front of the seat is a chart mesh pocket. This is smart use of otherwise bland useless space. Up on top of this space is a small stuff tray that has a rubber mat to keep the stuff quiet underway. The bucket seats are very comfortable and have a grab handle built into the back and a chart pocket in the back under the grab bar. The seats slide to your comfort and can swivel 180 degrees so the companion rider can watch the skier or both can join in on a conversation with friends at anchor. The helm is smartly and comfortably arranged for easy view and monitoring of gauges. Switches are circuit breaker protected; in fact they are double protected. Gauges have real wood accents. The stereo remote is at the helm on the right side along with a digital air/water temperature gauge and a digital depth gauge. One of my favorites in the cool weather was the optional helm heater vent. This really made the ride out on a cool day so much more enjoyable. The carpeting is seamed from beam to beam because the cockpit is so wide, standard carpeting isn’t big enough. The carpeting continues up the walkthrough, which is a nice feature. The sun pad doubles as the engine hatch which is easy to lift without power. Inside you have lots of space next to the engine on the starboard side and a wake board rack on the port side. Back on top, the ski tow post is easy to pull up and locks into optimum position for skiing. On the stern, you have a beam width locker that can be divided or used as a huge stern cooler. Excellent grip non-skid covers the stern area which has a stainless rail protecting again dock strikes. There is a trim tilt switch on the stern and the swim ladder has a release lever on the platform.Stepping BelowThe cabin has abundant seating that wraps from port to starboard and filler cushions to turn this entire space into a large bunk. There is a port-a-potty down here and enough lighting thanks to the portholes, and plenty of storage for the gear you’ve brought aboard. The stereo is mounted inside out of the elements and has two 12-volt sockets for charging phones and other portable gear. SpecsThe 255 for 2005 is 25 feet length overall and has an 8’6” beam. She weighs in at 5000 lbs. and has a 103” clearance for bridges with the ski tower. She carries 73 gallons of fuel for a great long day of fun on the water and has a 10 gallon fresh water capacity. She has a healthy freeboard with 42” forward and 39” aft. With the drive up she requires 24” draft and with the drive down she needs 39” draft clearance.Performance and RideWe managed to miss the rain when testing but did test her in some chop of 1-2 feet. She handles very well around the docks and scoots along and makes tight turns with little loss of speed, no noticeable skip or cavitation. She has little bow rise as she jumps on plane in just 3.9 seconds and is passing thirty miles per hour in 6.9 seconds. The 255 cruises at 2500rpms or 28.1 miles per hour and has a fuel burn of 8 gallons per hour at this speed. Cruise will get you about 231 miles on a tank of fuel. Wide open throttle is at 4600rpms and 55.5 mph and a fuel burn of 30.3 gallons per hour. Sound levels at cruise were 85dBa and at wide open was 93dBa.If you are looking for a mid-range runabout with the capability of providing luxurious escape from the elements as well as a thrilling ride, the 255 is a boat to consider.

    Test Result Highlights

    • Top speed for the Cobalt 255 (2005) is 55.5 mph (89.3 kph), burning 30.3 gallons per hour (gph) or 114.69 liters per hour (lph).
    • Best cruise for the Cobalt 255 (2005) is 28.1 mph (45.2 kph), and the boat gets 3.51 miles per gallon (mpg) or 1.49 kilometers per liter (kpl), giving the boat a cruising range of 231 miles (371.76 kilometers).
    • Tested power is 1 x 375-hp Volvo Penta 8.1Gi sterndrive.

    Standard and Optional Features


    CD Stereo Standard
    Head: Portable Standard
    Power Steering Standard
    Trim Tabs Standard

    Exterior Features

    Carpet: Cockpit Standard
    Ice Chest Standard
    Outlet: 12-Volt Acc Standard
    Swim Ladder Standard
    Swim Platform Standard
    Tower: Watersports Optional
    Transom Shower Optional


    Bimini Top Optional
    Cockpit Cover Optional


    Hull Warranty
    Deck Warranty
    Transferable Extendable
    10-Years 10-Year transferable protection No
    Engine Warranty
    5-Year No
    Powertrain Warranty
    5-Year transferable protection
    Gelcoat Warranty
    2-Year transferable protection
    Accessories Warranty
    1-2 Year Yes
    ISO Certification NMMA Certification Yes
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