Now something like this would be neat.
I have toyed with making something like this, but I would want to use something that:
a) addresses the issue of galvanic corrosion
b) maybe make it a " replaceable insert", which could make it’s only (negligible) benefit as an aero chainring, with maybe being able to provide different tooth profiles for previously incompatible chainrings and cranks.
Hell, it definitely looks like it could have come from someone’s garage.
Galvanic corrosion? Where/how?
Looks like someone glued some CF onto an existing chainring.
Bonding aluminium chainring to carbon fibre, for one. Yes, if you insulate with glass, it would be better.
Just buy this one for 150.00
http://www.fibre-lyte.co.uk/fl/fl_cycles_carbon_chainring.html
.
I would not even say it looks co-moulded like some examples I have seen.
I have seen people glue very thin sheets of either CF or Kevlar to a ring. I guess it would do relatively the same thing as a solid ring (as far as the aero factor goes) with a fractio of the weight.
The only thing is that unless the teeth were made of ti or stainless, you introduce more of a galvanic corrosion factor than is necessary.
I wouldn’t have guessed… Here’s more:
Abstract: Experimental results show that when carbon fiber/epoxy resin composite materials are joined with high-strength titanium alloys, aluminum alloys, lCrl8Ni9Ti stainless steel, or other structural materials, galvanic corrosion and crevice corrosion take place on the contact boundaries. This corrosion is primarily determined by the electrochemical properties of the materials. It is also related to the materials’ mutual coupling situation, treatment technology, and environmental conditions. Galvanic corrosion is affected by the coupled materials’ static energy of corrosion (Ecorr), galvanic currents, and other dynamic closed-circuit properties. In a 3.5% NaCl solution, materials’ electrochemical properties and treatment techniques tended to have similar effects on galvanic corrosion and crevice corrosion. When soaking weight loss methods, salt spray methods, and crevice corrosion methods were used to test couples of CFRM with anodized titanium alloys or couples of CFRM with hot water-sealed or chromate-sealed aluminum alloys, the materials were proved to be stable and satisfactory for the needs of engineering applications. (MM) ANNOTATION: Contact Corrosion Between Carbon Fiber Reinforced Composite Materials and High-Strength Metals --Translation.