The primary difference between the winter (L) and premium rings (R) is in the amount of machining (click to enlarge).
Well regarded oval chainring maker absoluteBLACK has once again expanded its ever growing product line to include a set affordable winter-specific rings. The new elliptical chainrings share all the same features and functionality with the U.K.-based company's premium line, but have less machining, which makes them both easier to clean and less expensive.
Both sets have a series of angled up-shifting ramps to make shifting smooth and trouble free (click to enlarge).
Expect to pay around $150 for a road set-up, which is about $50 less than a similar premium set-up. This reduction in price does not affect material make-up or anodization, and you'll still have the full range of choices, including the likes of 4- and 5-bolt 110bcd. Also be on the lookout for new SRAM Red and Force 22 compatible rings, which will accommodate for the hidden fifth bolt utilized by those systems. These new winter rings are billed as a great choice for your training or rain bike, where function and ease of use are paramount.
Here's an explanation of the philosophy behind the benefits of using ovalized chainrings on the road.
[vimeo width="610" height="343"]https://vimeo.com/152897512[/vimeo]
And check out this video for a better understanding of how they shift.
[vimeo width="610" height="343"]https://vimeo.com/153006841[/vimeo]
For more information visit absoluteblack.cc.