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South Dakota is a wonderful state to visit and not bad for cycling either đź‘Ť. The Top 3 hardest bike climbs in South Dakota are:
SOUTH DAKOTA #1 O’NEIL PASS
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Ride 29.6 miles gaining 3,096’ at 1.9% average grade (2.4% climb only).
SOUTH DAKOTA #2 SPEARFISH CANYON
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Cycling Spearfish Canyon
Ride 20.3 miles gaining 2,518’ at 2.3% average grade
The climb begins in the historic mining town of Spearfish and ascends into the magnificent Spearfish Canyon, ending just beyond Cheyenne Crossing.
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Spearfish and O’neil Pass share their first 17.4 miles with each other.
SOUTH DAKOTA #3 TERRY PEAK
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Cycling Terry Peak Summit Road - the hardest bike climb in South Dakota.
Ride 6.1 miles gaining 1,539’ at 4.4% average grade (5.5% climb only).
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Gravel for the last 3.2 miles - the last 9/10’s of a mile averages 8.3%.
Manageable but we recommend 30mm+ tires.