South Bay 420FC - 25 in. Upgrade 2012 boat specs
South Bay
South Bay 420FC - 25 in. Upgrade 2012
2012
View full specs →
VS
South Bay 8520C 2007 boat specs
South Bay
South Bay 8520C 2007
2007
View full specs →

South Bay 420FC - 25 in. Upgrade 2012 vs South Bay 8520C 2007 — Same Brand, Different Boat

The South Bay 420FC - 25 in. Upgrade 2012 vs South Bay 8520C 2007 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 — South Bay 420FC - 25 in. Upgrade 2012 at 19,8 ft versus South Bay 8520C 2007 at 21,0 ft. Weight tells a clearer story for trailering families: the South Bay 8520C 2007 tips the scales at 2 175 lbs — 2 012 lbs less than the South Bay 420FC - 25 in. Upgrade 2012 at 163 lbs. That difference is meaningful if you're working within a half-ton or three-quarter-ton truck's tow rating, especially once you factor in a motor, gear, and fuel.

Both boats share a closely matched power ceiling — 90 hp for the South Bay 420FC - 25 in. Upgrade 2012 and 90 hp for the South Bay 8520C 2007. Real-world performance will come down more to which motor is actually bolted on, its load at the time, and whether it's a 4-stroke or 2-stroke setup. Both carry nearly identical fuel loads — 27 gal and 29 gal — so range won't be a tiebreaker here.

Both boats are rated for 10 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.

At this size, power-to-weight ratio matters more than outright horsepower. The South Bay 420FC - 25 in. Upgrade 2012 comes in at 2 lbs per hp versus 24 lbs per hp for the South Bay 8520C 2007. 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.

The South Bay 8520C 2007 is an inflatable design — lighter, easier to store, and quicker to launch from a beach or dock without a slipway. The South Bay 420FC - 25 in. Upgrade 2012 is a rigid hull, which typically offers a more confident ride in chop and easier maintenance over the long term.

Bottom line: The South Bay 420FC - 25 in. Upgrade 2012 and South Bay 8520C 2007 are closely matched on the specs that matter most. Test-ride both on the water you actually use, check current dealer pricing, and factor in long-term service access before you sign.
General Boat Info
MakeSouth Bay
MakeSouth Bay
Model420FC - 25 in. Upgrade
Model8520C
Model Year2012
Model Year2007
Measurements / Dimensions
Beam8 ft. 6 in
Beam8 ft. 6 in
Beam - Meters2.59
Beam - Meters2.59
Beam - Inches102
Beam - Inches102
Weight - Detail1,630 lbs
Weight - Detail2,175 lbs
Weight - kg739.35
Weight - kg986.56
Weight - lbs.163
Weight - lbs.2175
Length [deck]18 ft. 1 in
Length [deck]not available
Length - Feet19.75
Length - Feet21
Length overall - Detail19 ft. 9 in
Length overall - Detail21 ft. 2 in
Length overall - Meters6.02
Length overall - Meters6.45
Length overall - Inches237
Length overall - Inches254
Length - Inchesnot available
Length - Inches2
Body / Hull
Hull materialAluminum
Hull materialAluminum
Hull typePontoon
Hull typenot available
Pontoon and Inflatable Specific
Tube diameter25 in
Tube diameter25 in
Number of tubes2
Number of tubes2
Tube gaugenot available
Tube gauge0.09 in
Engine and Drivetrain
Fuel tank capacity - Detail27 gal
Fuel tank capacity - Detail29 gal
Fuel tank capacity - Liters102.21
Fuel tank capacity - Liters109.78
Fuel tank capacity - Gal27
Fuel tank capacity - Gal29
Fuel typeGas
Fuel typeGas
Drive typeOutboard
Drive typeOutboard
Engine max90 hp
Engine max90 hp
Operational Info
Maximum capacity1,865 lbs
Maximum capacity1,955 lbs
Maximum people10 / 1,360 lbs
Maximum people10 @ 1,450 lbs

South Bay 420FC - 25 in. Upgrade 2012 vs South Bay 8520C 2007 — Common Questions

Which is the larger boat — the South Bay 420FC - 25 in. Upgrade 2012 or the South Bay 8520C 2007?
The South Bay 8520C 2007 is the longer of the two at 21,0 feet overall. The South Bay 420FC - 25 in. Upgrade 2012 comes in at 19,8 feet, making it roughly 1,3 ft shorter — a meaningful difference in deck room and overall on-water presence.
Which is easier to trailer — the South Bay 420FC - 25 in. Upgrade 2012 or the South Bay 8520C 2007?
For trailering, the South Bay 420FC - 25 in. Upgrade 2012 has the edge at 163 lbs dry weight versus 2 175 lbs for the South Bay 8520C 2007. 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.
How many people can each boat hold?
The South Bay 420FC - 25 in. Upgrade 2012 is Coast Guard rated for 10 passengers, while the South Bay 8520C 2007 is certified for 10. 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.
Do these boats require an oversize trailer permit to tow on US highways?
Both the South Bay 420FC - 25 in. Upgrade 2012 and South Bay 8520C 2007 share an 8 ft. 6 in beam — meaning both sit right at the 8’6" threshold that most US states use for standard-width loads. In most states you can tow at that width without a special permit, but regulations vary. Always check the rules for your state and any states you'll be passing through before your first long haul.
How do the fuel tanks compare on the South Bay 420FC - 25 in. Upgrade 2012 and South Bay 8520C 2007?
Both boats carry similar fuel loads — 27 gallons and 29 gallons respectively. Range will depend heavily on motor choice, throttle usage, and whether you're on flat lake water or coastal chop.
Are the South Bay 420FC - 25 in. Upgrade 2012 and South Bay 8520C 2007 from the same manufacturer?
Yes — both the South Bay 420FC - 25 in. Upgrade 2012 and the South Bay 8520C 2007 are built by South Bay. 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.