Folding Bikes - Mobiky Genius gearing?

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brianinc-ville
12-22-10, 11:10 PM
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!

tcs
12-24-10, 10:11 PM
AtoB magazine reported that the Mobiky Genius had three gears of 37", 50" and 66".
brianinc-ville
12-24-10, 10:57 PM
AtoB magazine reported that the Mobiky Genius had three gears of 37", 50" and 66".

Excellent! Thanks!

cyqlist
12-26-10, 04:01 AM
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.