I am waiting for my new cyclocross frameset to arrive. The frameset requires a BB30 crank and bottom braket so I purchased a compact SRAM Red BB30 crankset that comes with 50/34 chainrings. Also purchased 46 and 36 toothed FSA chainrings because that's the combination I use for 'cross and SRAM doesn't make this combination (no 110 BCD 46t SRAM chainring exists to my knowledge).
This evening I removed the Red chainrings and was going to install the FSA chainrings but the 46t FSA chainring would not fit. Upon inspection it was obvious that the pin on the 46t chainring that sticks out towards the crank arm and that, as far as I've always been told, you are supposed to align with the crank arm to prevent the chain from slipping between the large chainring and the crank arm, was hitting the crank arm and preventing the chainring from seating properly on the spider. I then looked at the SRAM 50t chainring and saw that it does not have such a pin.
So, should I simply grind the pin down until it no longer touches the crank arm? Should I rotate the 46t chainring one position so that the pin is no longer under the crank arm? Should I look for a 46t chainring that does not have a pin?
Thanks for any advice.