Any aero benefit to cutting your fork/steering tubedown to minimum? Currently slammed, no spacers, and my bta bottle blocks the stem so I’m thinking its shielded…but what does everyone think?
Edit: said stem lol 
I think cutting the stem would result in an expedient trip to the dentist if not the emergency room. I assume you mean the cutting of your steerer tube? 
Cutting it should be more aero I’d imagine. Even if it is shielded by your BTA, it’s not an integral extension of the BTA, nor is it particularly aero in shape. Now, how much difference will it make? I’ll leave that to the truly smart and savvy aeroweenies.
Any aero benefit to cutting your fork/steering tubedown to minimum? Currently slammed, no spacers, and my bta bottle blocks the stem so I’m thinking its shielded…but what does everyone think?
Edit: said stem lol
One time at a wind tunnel test I taped 40 mm of spacers on top of a flush steerer tube. Added about 7 grams of drag. This was bike only (no rider) and no BTA bottle. With rider and bottle… maybe it’d be something less than 7 grams? FWIF, tunnel balance was said to be +/-5 grams.
Thanks for the reply Damon!