danscomp.com
Yes
yes
no it will be to easy to pedal
a 25 tooth sprocket will fit on a 9 tooth driver
well if you have a 8 tooth rear driver you will need a 23t sprocket, if u have a 9 tooth rear driver you will need a 25t sprocket, if u have a 10 tooth rear driver you will need a 28t sprocket, and if you have a 11 tooth rear driver you will need a 30t sprocket
Just a little short of 1:5
Not a sprocket only, but you can buy a 23-tooth freewheel that should fit.
no you can not 25 with 8
9 tooth driver
a 9 will do but an 8 would be better
13 tooth front/ 40 tooth rear
It uses a 47 tooth sprocket.