Mobiky Genius gearing?
I've never seen a Mobiky Genius in person, but I'm intrigued. I can't seem to find the gearing information anywhere on the Internet, though. If you've got one: how many teeth do each of the three sprockets have, what kind of 3-speed hub does it have, and then (maybe) can we figure out what that means in gear inches? Thanks!
AtoB magazine reported that the Mobiky Genius had three gears of 37", 50" and 66".
Originally Posted by tcs
The sprocket sizes are 33, 28/14, and 16. The nominally 12½ x 2¼ tires (ISO 62-203) are actually only 12" in diameter.
33/14 x 28/16 x 12" = 49.5" for direct drive.
The hub on mine is a Sturmey Archer SRB3 with 4/3 and 3/4 ratios for high and low, giving 66" for the high and 37" for low gear. Newer versions may have a Shimano Nexus hub which has slightly wider ratios for high and low.
I changed my rear hub sprocket from 16 to 18 teeth, which gets me up hills a little easier, and provides a little more clearance between the chain and the chainstay.