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Good question, not sure why they've gone from 16 to 4 percent, but the 'doval_su' seller on eBay (seems to be doval themselves) were/are selling them via auction rather than buy it now, so got them a fair bit cheaper than they would've been otherwise. Thought it was worth a try.
Not sure if it's just marketing crap to sell more rings, but they came out with the 'doval for clipless' shape and the ultra low ovality in pretty quick succession.
I haven't tried dovals on the Brompton. Might do at some point if they sell them via auction, rather than full price...
TurtleRecall
@bertocq
I thought about using Doval as well on my Brompton, but I've stopped riding for some months, maybe on spring I'll retake interest. Are you planning to do so on your Brompton?
Anyway why I can't understand is why going for just 4%? Benefit in my opinion is just getting your legs a little less tired by avoiding that effort when pedals are at 12:30 position, I tried max % to see how it felt and was only thinking about decreasing it in case it was so radical I would get uncomfortable/injured.
I recall pedalling smoother while climbing out of the saddle with Doval compared to circular rings from my last rides, but can't truly compare if it was just my legs getting fitter.