Pretty funny story about Kasheckin from the inrng blog.
Round Rings for Wiggins
Not the Olympics, but chainrings. I keep being asked why Wiggins isn’t using oval chainrings. He used the Osymmetric rings in the Tour de France last year but is back to round ones for the Giro. Did Shimano pay him a lot of money to ride on their equipment or were the gains not there? I don’t know.
What’s more certain is that the use of oval rings lends itself to longer distance linear efforts where steady pacing works. In other words they can be effective on a long and regular climb like you get to a ski station in the Tour de France, But on the winding tarmac that was once a goat path style of climb in the Giro they’re less use, more so when you’re changing pace to win sprints for time bonuses. So my hypothesis would be that these chainrings are more suitable for the Tour than the Giro and this is why Chris Froome continues to use them whilst Bradley Wiggins has stopped. Add to this the fact that Wiggins has dropped his chain a few times and the gains, if they exist, are small once you net off the risk of stalling because you’ve dropped your chain. Note it’s not just Sky, Europcar’s Pierre Rolland is using them and his slow grinding style is suited to this.
I still laugh at the tale of Astana’s Andrey Kasheckin who bought a pair and gave them to a mechanic to fit. Hours later the Kazakh went for a ride but didn’t like them at all. Only the mechanic had installed them the wrong way, rotating them 90° so rather than having more power on the downstroke Kasheckin was reduced to pedalling hard across the top and bottom of the revolution.