Can l add more gears by replacting the cassette on my mountain bike? I have a Giant Yukon with 8 speed. I want to know if l can change it to 10 or even 11 speed?
Is it possible to change the cassette on the rear wheel?
To do that you need to change the shifter and derailleur as well.
Different brands, and different numbers of cogs on the rear require different amounts of pull on the gear cable to shift one gear, and the cogs, chain etc are all different sizes. This also means that the total cable moved to get from highest to lowest gear is generally also different. Note that it's usually specified in tenths of a millimetre (0.1mm), so everything has to be quite precise. Otherwise the bike won't stay in gear.
While you can change everything over like this it's generally more expensive than selling your bike and buying a newer or higher spec one with the new groupset on it. If you can find a damaged bike with the necessary parts intact that's likely to be the only cheap way to make the change.