Shimano Groupset 8 Speed Retro Mountain Bike Gears Sram Centera Grip Shift

Lovely retro 8 speed groupset Sram centera 3 x 8 shifters Alivio 8 speed rear mech Shimano front mech Original chain n cassette 30 x 11 Shimano chainset 42 32 22 Plenty of life left in this Would benefit a good degrease Please study pics