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@VELOFUNFR
48x18 (FSA Gimondi / Shimano Freewheel) but I live ine a very hilly part of Paris. This allow me to climb even tired after a working day, under the rain without problem
This ratio 48x18 is too low for flat area, If I lived in a flat area I'd use at least 48x16
On the flat at reasonnable spinning average speed is around 23/25 km/h and donwhill would require a huge lot of spinning (it's the reason why I use a freewheel)
Luc