Dura-Ace 9000 chainset employs a four-arm spider and the usual Hollowtech II construction to save weight. Now the bolt circle diameter is the same now for compact and traditional cranks.
Simon Whiten (London and Northumberland, UK) has been riding for over 20 years and raced the road and the track extensively in the UK and Europe. He is obsessed with the turbo trainer and the ‘shortcut to race fitness’.