Distance
23 mi
Duration
40m
Checkpoints
2
Road type
Mountain twisty
Region
Southeast
Length
Medium (20-50 miles)
Surface
Paved - modern
Intensity
Technical
Season
Fall
Winter status
Sometimes closed
About
US 421 over Holston and Iron Mountain between Bristol and Mountain City — 489 curves and three mountains, and the reason Shady Valley has a motorcycle shop and not much else. Tight, steep and relentless; the middle section rarely lets you out of second and third. Photo: Brian Stansberry / CC BY 3.0, via Wikimedia Commons.
Checkpoints
2
Checkpoints · Members only
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