mtb
✓ Verified Active Listing
AMBCS Series Race - Old Post Challenge 2026
🧬 Course DNA & Technical Intel
📏 Primary Distance
18 mi
🛞 Recommended Tire
2.2" – 2.4" XC Tubeless
🚴 Discipline
mtb
🏁 Course Distance Options
EXP (Cat 1) Female 15-29
EXP (Cat 1) Female 30-39
EXP (Cat 1) Female 40+
EXP (Cat 1) Male 15-18
EXP - (Cat 1) Male 19-29
EXP - (Cat 1) Male 30-39
EXP - (Cat 1) Male 40-49
EXP - (Cat 1) Male 50-59
EXP - (Cat 1) Male 60+
INTER - (Cat 2) Female 15-29
INTER - (Cat 2) Female 30-39
INTER - (Cat 2) Female 40-49
INTER - (Cat 2) Female 50+
INTER - (Cat 2) Male 15-18
INTER - (Cat 2) Male 19-29
INTER - (Cat 2) Male 30-39
INTER - (Cat 2) Male 40-49
INTER - (Cat 2) Male 50-59
INTER - (Cat 2) Male 60+
NOV - (Cat 3) Female 19-29
NOV - (Cat 3) Female 30-39
NOV - (Cat 3) Female 40-49
NOV - (Cat 3) Female 50-59
NOV - (Cat 3) Female 60+
NOV - (Cat 3) Male 19-29
NOV - (Cat 3) Male 30-39
NOV - (Cat 3) Male 40-49
NOV - (Cat 3) Male 50-59
NOV - (Cat 3) Male 60+
Single Speed Open
Clydesdale (Riders must weigh >225lbs)
E-Bike Female (Class 1—no throttle, max speed of 20 mph)
E-Bike Male (Class 1—no throttle, max speed of 20 mph)
First Time Racer Female
First Time Racer Male
NOV - (Junior Cat 3) Female 10 and Under
NOV - (Junior Cat 3) Male 10 and Under
NOV - (Junior Cat 3) Female 11-12
NOV - (Junior Cat 3) Male 11-12
NOV - (Junior Cat 3) Female 13-14
NOV - (Junior Cat 3) Male 13-14
NOV - (Junior Cat 3) Female 15-18
NOV - (Junior Cat 3) Male 15-18
About AMBCS Series Race - Old Post Challenge 2026
Official registered mtb event in Russellville, AR. Direct registration on BikeReg.
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⚙️ Recommended Pro Hardware for AMBCS Series Race - Old Post Challenge 2026
Top-rated power meters, radar, and GPS computers curated by Threshold Cycling.
Dual-Sided SPD Accuracy
View Product Specs ↗
Favero Assioma Pro MX-2 Power Meter Pedals
$759.00
±1% real-world power accuracy, seamless Bluetooth/ANT+ connectivity, and full rock strike durability designed specifically for gravel epics.
Backcountry Safety
View Product Specs ↗
Garmin Varia RTL515 Radar Tail Light
$199.99
Detects approaching vehicles up to 153 yards away with visual and audible cockpit alerts on your GPS computer. Vital for remote rural gravel roads.
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