One further thought - my Ultegra chainrings are a five bolt design. I’ve not checked them yet but I wonder if they are comparable with the P2M spider on Rotor cranks and if so, might be a worthwhile test to run out a few things from the equation?
One further thought - my Ultegra chainrings are a five bolt design. I’ve not checked them yet but I wonder if they are comparable with the P2M spider on Rotor cranks and if so, might be a worthwhile test to run out a few things from the equation?