When two boats share the same hull type — in this case both the Larson LX 850 Classic 2011 and the Larson SEi 180 LX I/O 2007 are modified vee designs with fiberglass construction — the buying decision usually comes down to a handful of practical questions: how many people are you putting on the water, how far do you trailer, and what does your tow vehicle weigh?
On paper these two are close siblings in the size department — Larson LX 850 Classic 2011 at 18,4 ft versus Larson SEi 180 LX I/O 2007 at 17,0 ft. Weight tells a clearer story for trailering families: the Larson SEi 180 LX I/O 2007 tips the scales at 2 365 lbs — 2 120 lbs less than the Larson LX 850 Classic 2011 at 245 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 — 225 hp for the Larson LX 850 Classic 2011 and 225 hp for the Larson SEi 180 LX I/O 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 — 23 gal and 23 gal — so range won't be a tiebreaker here.
For family outings this is probably the sharpest distinction between the two. The Larson SEi 180 LX I/O 2007 is rated for 8 passengers, while the Larson LX 850 Classic 2011 caps at 7. If you're regularly pulling extended family or a group of friends onto the water, the extra seats on the Larson SEi 180 LX I/O 2007 could be the deciding factor.
Bottom line: Choose the Larson SEi 180 LX I/O 2007 if your priority is putting more people on the water — it handles 8 passengers and at 17,0 ft it has the deck room to back that rating up comfortably. The Larson LX 850 Classic 2011 is the smarter pick if you want a lighter, easier-to-trailer boat rated for 7 that costs less to run day-to-day.