2 to 6 is a straightforward upgrade. New rear wheel, extra gear lever, a few other minor gubbinses.
You'll need a new rear wheel - deraillleur, shifters, spring thingy and cables.
The derailleur and left shifter and springy thing are the same on the 2 and the 6.
@coventry_eagle started
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2 to 6 is a straightforward upgrade. New rear wheel, extra gear lever, a few other minor gubbinses.