Can I give my bike a mullet (ride a 27.5” wheel in the back)?

If you fancy running a 27.5” wheel instead of a 29” wheel in the rear of your 4060 frame (aka, a mullet set up) you can. Swapping to a smaller wheel makes two main changes; it lowers the bottom bracket and it slackens the seatube and headtube angles. For a bike in ST configuration, these effects can be compensated for by flipping the lower link chip to the LT setting so that the bottom bracket is raised. For a bike in LT configuration the flip-chip is already in the high position, so if you want to raise the BB adjust the headset to the steeper setting (with the notch facing backward).