Drive train is smooth and silent when on work stand – funny grating sound when pedaling under pressure – what is it??
? chain (SRAM S/S) rubbing on bash guard (Hone double and bash with inner removed)
May Allah bless you with a thousand cakes if you can help. 😉

chain is too tight

chain is too tight
S'not particularly taught. 😕

disk rubbing? Or maybe its the feather stuck in the front wheel?

You could upload a soundclip?

really bad chainline? looks like may be a SS hub though? hard to see. spacers on BB wrong and its a non SS chainring with some shaping?

or maybe old chain / new cog

your knees?

S/S hub, new freewheel, new chain. My knees creak at a much deeper pitch. 😉
2 spacers on BB drive side (same as pre-rebuild).

BUMP. *sorry* Any more ideas?? 🙄

Have you tried it without bashguard and/or different cog?

Have you got a half link in your SS chain?? Mine made a terrible racket till i removed it!

is your half-link sticking out a bit? – mine was when I built it and it was rubbing on the bash – I just turned the link around so the fastening clip thingymajig mounts on the inside now.

New cog and chainring with the new chain,?

if the chainring is your old one skip the chain on 1 tooth.

There is no play or owt in the HTII BB but could it be the BB? – s'nearly 12months old………………you must understand that this is my first HTII so I'm not familiar with knowing when they're going, so to speak.