>>1070875I upgraded from a 9 to a 10.
9 speed is wider than the 10 speed cassette so you need a spacer.
You only need one shifter.
I also couldn't find a good deal on a 10 speed crankset so I used an 11speed crankset.
My bike is 9 speed tiagra front brifter, 10 speed rear brifter from microshift an off brand China company, 11 speed crankset, 11 speed front Derailleur both 105 but the crankset I put a tiagra 53/39 chain ring on, 10 speed kmc chain, 9 speed wheel, 10 speed cassette, 10 speed 1.0mm flat washer on hub, and 10 spd 105 rd
I did it all because someone on bikesforums said it can't be done. Literally everything on my bike is something someone said can't be one.
Including putting hollowtech II bottom bracket on a frame designed for cartridge bb
Someone also said titanium frames don't exist on bike forums well my bike must not exist
