Originally Posted by
Chuck M
FWIW, the Shimano rotors on my bike are opposite of the ones with the arrow in the OP. I'd wage though that this thread is going to turn into a big pissing contest going 20 plus pages.
Yeah, I'm sure it will. I was sure that it would even before I started it.
Except for this and another type of Grimeca rotor (and a couple of Hope models that don't have arrows at all,) every rotor I ever see has its spokes pointing in the same direction as the arrow, just like the Shimano ones you mentioned. Which makes me wonder if Grimeca made their rotors this way by design or someone goofed up at the factory and they didn't think it was critical enough to initiate a recall. It also makes me wonder if Hope's rotors would be fine mounted either way.