In a straight line, our bikes wouldn't touch a VTX 1800, big bore or not. The 1300 though can be taken because of it's 759 lb weight, and it's other numbers...bone stock 60.02 hp @ 5000 rpm and peak torque of 74.50 ft/lbs @ 3000 rpm.
It's easy enough to tell them apart. The 1800 has a hydraulic clutch, the 1300 doesn't. So when you look at the top of the handlebars, the 1800 will have reservoirs on both sides, while the 1300 just has the brake reservoir on the right like our bikes.
I used to ride with a group of Honda VTXs, and took numerous trips with them. On long straight stretches of road, the 1800s can cruise along easily at 90-95 mph, and top speed is somewhere around 140. Get in the twisties though, and few could keep up. It's one of the reasons I quit riding with them. There was just too big of a difference between our bikes. They would even go out of their way sometimes to avoid twisty roads.
