For some reason, I'm having a really hard time figuring out how to install an SRAM GXP BB and crank. I bought a new Lynskey franne with a 68mm threaded bottom bracket, and I'm installing a SRAM Force 1 crank (some reason I'm hooked on the idea of building a 1x11 commuter). The SRAM GXP bottom bracket comes with a couple of 2.5mm spacers, and I'm not sure if i need them or not.

The rear hub spacing is 142mm, and I'm running a 11x30mm cassette. I installed the crank without the spacers, and the crank spins freely with no play. Still I wonder if I need the spacers for the chainline? Anyone run into this? SRAM's manual is not very clear.

Thank you!