Its been while since I had to replace the main train drive parts on the mountain bike, but when the chain starts to jump when applying power it means you are in trouble! So it was required to change the rear cassette, chain and large/middle chain rings as you cannot just change the chain as this moulds into the front chain rings and cassette. Meaning that the new chain would still jump or slip. This is not so cheap costing me around £100 for all the new parts but it should last at least 12 months or more of riding where muck & mud grinds down your parts LOL.
I’ll post some pictures in photo log soon, hopefully before the new items loss the shine. But to top off the expense my left hand shifter broke just as I was riding down the road to test the bike, the joy of cycling