Chang Star 850AGP cantilever brakes, alloy 2-finger w/adjuster levers
Cockpit & contact points
Headset
1" steel
Handlebar
GT BMX Expert
Handlebar extensions
N/A
Stem
GT alloy
Saddle
GT BMX nylon
Seatpost
GT chromoly, 22.2 mm (7/8 inch) diameter
Wheels & tires
Hubs
Alloy
Rims
Weinmann 4019, 36-hole
Spokes
Steel, 2.0 mm straight gauge
Spoke nipples
Brass nipples
Front tire
20 x 1.75" GT AA Pro
Wheel size
20" wheels
Geometry · Legacy reference
Top tube
459.7 mm
Head-tube angle
70°
Seat-tube angle
69°
Chainstay / rear center
383.5 mm
Wheelbase
914.4 mm
Fork offset / rake
45 mm
Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on September 26, 2026.