Shimano Gearbox (I'm excited)

S

SummitFever

Eats Squid
No Skid Marks

No Skid Marks

Blue Mountain Bikes Brooklyn/Lahar/Kowa/PO1NT Raci
beeb said:
Their original design is great, if you're okay with having bugger-all anti squat. The original box design pretty much means the only place you can have the suspension pivot is on the output axle, which is extremely limiting for suspension design. To my mind, the concentric pivot is the better option as it allows for so many different linkage designs, including the option to utilise a high-idler designs. That would mean you could feasibly design a high anti-squat, low pedal kickback gearbox transmission bike. I just love the flexibility of the concentric design, and it will hopefully see the Effigear designed gearboxes become as common (if not possibly more) than the weighty Pinion boxes.
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You can have pivot higher than output on the current effigear design, giving as much anti squat as you like.
Consentric is more limiting IMO. But pivot or virtual pivot should be higher than chain line imo.
discofrank said:
gearbox on a bike goes back to 1894 yes 1894
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they predate mechs I think.
 
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