Jezston said:Sorry, how to I go from teeth to inches?
tyred said:On a slightly related note, does anyone use a Sturmey Archer XRD8? I do fancy the idea of converting my Peugeot to hub gears at some point in the future. I have spare AW hubs but would like a wider gear range so I homed in on the XRD8 to look at the spec and it seems that bottom gear is a 1:1 drive. Surely this is crazy and would require a chainwheel and rear sprocket of the same size to give a sensible gear range?
tyred said:...it seems that bottom gear is a 1:1 drive. Surely this is crazy and would require a chainwheel and rear sprocket of the same size to give a sensible gear range?
arallsopp said:Depends on what the top gear ratio is, and what kind of gear inch you'd consider sensible at the low end. I can barely spin fast enough (and frequently don't manage) to keep my bike upright at 19.4" gear inches.
A good target range for me is 25" at the bottom and around 110" at the top. 25" is enough to pull me through 15% hill starts on my loaded commuter, and 110" is good for 35mph sprints. Above that, I spin out and have to convince gravity to lend a hand.
GrasB said:Could be done with a double at the front but difficult due to 1:1 being the lowest ratio.