I have a old 1982 Raleigh Rapide 10spd (2X5). Would I be able to install Shimano 105 20 spd (2X10) crank/cassette system on the bike? If not, then can I find an integrated shifter-brake system (like Shimano or SRAM) for this machine using the 2X5 crank/cassette sprockets already on the bike? Any feedback would be greatly appreciated!