MF-TZ500-7
that seems to be a freewheel and not a cassette
https://www.spacycles.co.uk/m8b0s112p342/SUNRACE-7-Speed-Freewheel
It's what I figured, just wanted to know if it's possible, plausible actually, to just change the smallest cog to a 13. He's famously cheap.
@withered_preacher started
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that seems to be a freewheel and not a cassette
https://www.spacycles.co.uk/m8b0s112p342/SUNRACE-7-Speed-Freewheel