Burgtec Thick-Thin Oval Shimano Direct Mount Chainring

Does a mechanical advantage of increased gearing sound Interesting? If so, read on.

Through research and testing of many different prototypes with varying amounts of Ovality theyfound 115% (from the top centre) to be the optimum.

This shrank the dead spot suitably and gave the same flawless chain retention as their round rings. The shortening of the dead spot on the top and bottom of the power curve allows you to get back into the power phase of your crank rotation sooner.

The benefit of this is twofold; increased gearing on the downward stroke and faster crank speed to get the crank propelled back around into the power phase continually. This is a significant gain because virtually all studies into pedalling performance suggest that a minimum 80% of your power comes from the downward motion. Mainly because much larger muscle groups are used for this motion. The physics sorcery adds extra power in the downwards stroke for no extra effort by reducing the dead spot and adds a bigger gear for the now larger power phase in the downward stroke. Win, win.

Features

Thick Thin Tooth Profile

10, 11 and 12 Speed Compatible

115 Degrees of Ovality

Fully CNC Machined from 7075 Aluminium

Specifications