I always mount my tires so that the label is centered on the valve. Not for OCP purposes, but in case I get a flat. This way, I can figure out where in the tire the penetration occured, and I can examine that area more closely for remaining debris.
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my bike page - my journal
Current Stable: Trek Emonda SL - Trek Top Fuel 8 - Scattante XRL - Jamis Dakar Expert - Trek 9700 - AlpineStars Al Mega