sprocket size RD 07

[clarence]

I know this has been beaten to death but what would be the alternative size IE 16/42 or stick standard 16/45 for everyday use using rear tyre size standard .  What is the max tooth variation 2 t 3 t 4 t from standard

 

[brinco]

 

[Gerard]

 

[clarence]

 

[adv]