Double Bearing
Heavy Duty Sliding Gate Wheel Welded V Track 
Diameter  78 mm x 23 mm Wide Wheel
Precision Seal Double Bearing
Passivated Zinc Finish
Loading capacity for each wheel is approximately 250 kg
Code - WH479     $25.40 each
9.6mm
centres hole
78mm
110mm
136mm
23mm
32mm
36mm
22mm
Single Bearing
Heavy Duty Sliding Gate Wheel Welded V Track 
Diameter  78 mm x 20 mm Wide Wheel
Precision Seal Single Bearing
Passivated Zinc Finish
Loading capacity for each wheel is approximately 125 kg
Code - WH477     $18.40 each
There are 2 types of Wheels with the same dimension the only difference is Single and Double bearings, Double bearing wheel can carry more weight.
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Heavy Duty Sliding Gate Wheel 
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Sliding Gate Wheel 80mm Dia V Track
Internal Sliding Gate Wheel