The Montague Paratrooper Highline part # HIGHLINE20 is a 20 speed bike with 27.5 inch wheels whereas the Montague Paratrooper Pro part # PROBLK16 is a 27 speed bike with 26 inch wheels and has a rack over the rear wheel. So they are pretty similar but there is some distinct differences.
Some argue that the 27.5 inch wheel is a faster bike since less rotational inertia and a longer footprint which helps provide more traction and stability. view full answer...
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