Top tube - horizontal or slightly sloping tube that runs from the saddle to the front of the bike.

Head tube - tube on the front of the bike frame that connects the fork to the handlbears.

Downtube - tube connecting the head tube to the cranks.

Seat stays

tubes connecting the saddle/seatpost/top of seat tube to the rear wheel.

Seat tube

tube connecting the crank/bottom bracket to the pedals.

Front fork

connects the front wheel to the head tube/handlebars.

Chainstays

tubes connecting the crank/bottom bracket to the rear wheel.

Bottom bracket shell

holds the all-important bottom bracket - which connects the frame to the ranks.