To install the Shotgun Pro on a Trek bike equipped with a Knock Block headset system, you'll need this adapter. Ensure a minimum of 30mm clearance under your stem (from the headset to the bottom of the stem).
The Trek Knock Block adapter replaces one of your 10mm spacers, while the Shotgun Pro spacer (included with your Pro seat) replaces another 10mm spacer. One of your existing 10mm spacers remains directly under your stem.
If your stem clearance is below 30mm, consider creating additional space under your stem to accommodate the Shotgun Pro.
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