>>2048870>Planning on replacing Chain + Tires + Cassettechain: you need a chain tool to size a new chain to the gearing on your drivetrain. the tool slides the rivets in the links off and on. you put the chain around your biggest gears front and back but not through the rear derailleur, then you add link(s) to account for some length when you run it through the rear derailleur. up to 9 rear cogs is just one extra but you probably have more so probably 2 but I'd check with Park or whoever.
also more than 8 speeds you need a specific chain as well so buy what matches what you have. one of the links you add can be a quick link if you want. some need pliers depending on design.
tires: you can sometimes just use your hands with a particular technique but if not then you need tire levers. mostly they're all the same but if you happen to get super tight bead tires (also rims can have an effect here) then it's really difficult. for that, the only ones that worked for me were Pedro's levers.
cassette: against the smallest cog is a flange that screws down against it with splines inside it. you need a cassette cracker that fits your spline pattern e.g. Shimano. some other brands may be compatible with Shimano, I don't know. once that piece is off the whole cassette just slides off the hub no problem.
