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bertocq
@Vince
@bertocq Thank you for your input - I have been reading through the thread but it is still too technical for me! Not just the dual-ovality but also the "5 positions".
I ride 50/34 with an 11-28 cassette and spend most of my time in the UK on the 'big' ring and mid-cassette.
I had a look online and I found another (french) company selling dual-oval chainrings:
http://dual-oval.com/
Prices are half way between Doval and Osymetric at £80 for a set.
Their tech info is limited and looks like a copy/paste mash of other brands:
~Dual-Oval trays are made of Aluminum CNC T6 treatment.
The concept and design are 100% French, they are formed at an oval twice as Osymétric (less pronounced anyway) and not as a simple oval rotor.
The roundness of the Dual-Oval trays is similar to Osymetric trays or new Rotor QXL. However, Dual Oval trays are different from their twin oval design which creates a longer support (77 °), each pedal stroke is more efficient.
The oval dual eliminates dead spots, compared to a simple oval is more progressive.
When the dead come, the plate diameter gradually reduced and after gradually increasing.
Dual-Oval trays allow to gain power, endurance and reduce joint stress on your joints.
-Pédalage Rounder.
-consumption Of lower O2.
Reduces joint stress the knee.
Reduces the production of lactic acid.
Reduces heart rate.
External shelves are adjustable in 3 positions micro OCP.
It is recommended to try all positions and make your own judgment about which way you want. However, generally the riders who tend to have a high rate use more position 3 while the runners who have lower rates tend to use the position 1.
~