Delta Mega Rack Post Porter Seat Post Rack with Pannier Support Seatpost-mounting bike rack with legs--fits even full-suspension bikes Secure four-bolt clamp fits any seatpost size (24-32mm diameter) for a no-slip grip Pannier support up to 20 pounds Platform measures 12.5 by 4.5 inches Weighs 760 grams (26.8 ounces)