After 3 years of design and improvement, I am happy to announce this new patented coupler. Based on 3D printing technology, it covers aluminum, titanium, stainless, and any size or any tube shape（such as Columbus Max）. For reference, Figure 1 is the 35mm titanium version costs 180, and Figure 3 is the 31.8mm 316L stainless version, costs 130euro. For any diameter material shape of coupler， please contact me directly.
couplers built a steel frame with all tubes 2mm wall thickness; sent Germany EFBE passed all test：
Fatigue test with pedalling forces - passed
Fatigue test with horizontal forces - passed Fatigue test with vertical forces - passed Impact test falling mass - passed
Impact test falling frame - passed
K-Couplers the best frame couplers
€84.00よりセール価格