"Hi Clara, a lot of bike models have the same name followed by a number. Quite often the different numbers will have different wheels and gears etc but share the same frame. In most cases the number 1 model will be the lightest & most expensive.…"
"Hi Clara, as mentioned already, a road bike has the slightly larger (27" or 700c) skinnier wheels and the rider tends to be bent forward for less wind resistance. A mountain bike has the smaller (26") fatter wheels, some even have…"