Folding mountain ebike - The Big Dilema

What are those proprietary hiem joints that are very hard to buy that some used to build a folding bike?

Might be this S&S Coupler - S&S Coupling — TI CYCLES FABRICATION
S&S Couplers utilize an interlocking, tapered tooth design to create a joint that is incredibly stiff and strong yet able to be opened and closed with a simple pocket-sized wrench.
These look like they might be the couplers I was thinking about.

View attachment 342534


Phils Folding Bike has a unique design of his own making.

Richey Breakway its not Pinterest

Going down deep as this site gives a decent list

Santana/Paragon Machine Works Z Couplers​

BTC with BreakAway​

Ritchey BreakAway​

S&S Machine Bicycle Torque Coupling (BTC)​

No. 22 Bicycles Couplers and Brake Break​



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