DROPOUT THICKNESS INSPECTION
Over time the knurled surfaces of the front wheel hub and quick-release skewer wear out the dropout region of the lower leg (see Dropout photo below).
Inspect and measure the thickness of the dropouts every 6 months or 100 hours. Ensure that any point on the surface is above the minimum specification of 6.20mm (see Measure Dropout photo below).
Replace the lower leg assembly if the dropout thickness is at the minimum specification or smaller.