t2p

I have a Topstone I converted from Sora 9 speed / mech disc brakes to Tiagra / GRX etc 10 speed ***

I got the bike at a flea market - might have kept the Sora 9 speed drivetrain (at least initially) but I literally could not stop the bike

considered mech disc upgrade - there are some decent options (?) - but I have other bikes with hydraulic disc brakes and did not want to invest in mech disc upgrade that I might not be satisfied with

*** also considered upgrade to 11 speed drivetrain - which would be better option - but was concerned about 11 speed cassette compatibility with the OEM rear hub .. and I found good deal on new Tiagra 10 speed take off stuff (and dropped $$$ in the other components)