Patterson Transmission Crankset

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Front shifting will never be the same thanks to a great new invention by Sam Patterson – the inventor of Grip Shift™. The Patterson Bike Transmission delivers rocket fast front shifting every time This invention will change the way you ride your bike. Now you can use your front shifter any time to get the gear you want right now. Secure and precise. Unaffected by pedal speed or load. Once you try it, you will never go back to multiple chain rings again.

• Instant shifting
• Shifting while pedaling
• Shifting while coasting
• Shifting while standing still
• Improved ground clearance
• Optimal chain line
• Chain guarded to permit riding in street clothes
• Gearing equivalent to 28/45 T
• Sleek & Simple
• Compatible with any indexing front shifter (road or mountain bike)
• Compatible with rear derailleurs and internal gear hubs
• Freewheeling front not compatible with kick back brakes
• Easy to install on any bike with threaded 68mm BB, down-tube cable routing and fixed chain stays

• A new two speed internally geared crankset, compatible with most conventional frames. 
• Quick gear changes while pedaling, coasting, and standing still.

DESCRIPTION & MATERIALS

• Cast aluminum alloy crank arms
• External bearing BB
• Load shiftable two speed fully sealed planetary gearing system
• Equivalent to a 28 tooth physical plus a 45 tooth virtual chain ring set
• Overdrive ratio 1.6:1 increases gear range by 60% compared with single chain ring
• Downtube cable routing easy or use optional Cable Bracket for different routing
• Fits 68 mm BB

SIZES

• Length – L165mm, L170mm, L175mm
• Chainline – 46mm
• 28T physical chainring

 FINISH

• Brushed alloy silver or black enamel
• Color graphics

 WEIGHT

• 1734 g (complete assembly including BB)