Interesting, Thank you,
I currently have 15T at my bosch performance line CX, what is you suggestion for 2nd option, 18T ?
https://www.ebay.co.uk/itm/BCR-70e-Sprocket-Electric-Bike-E-Bike-E-Bike-Cog-Sprocket-18-Tooth/123322851625?hash=item1cb69d6129:g:OA4AAOSwpHpbKRAb:rk:20:pf:0
Do I need...