Sur les Tiennes from Piétrebais

At just 1km, Sur les Tiennes from Piétrebais is short but deceptively intense — 52m of elevation packed into a brief, breathless effort. The average gradient of 5% disguises ramps of 13.3% — the kind of gradient that turns plans into prayers. It's over before the legs know what happened — a short, explosive effort where momentum is everything. Located in Wallonia, Belgium.