For our drivetrains, 1712 has used the following wheels
2014 - 4" W Tread VersaWheels
2015 - 6" Colson Wheels
2016 - 8" Pneumatic Wheels (Andymark hubs with MBS tubes/tires)
2017 - 4" W Tread VersaWheels
2018 - 6" Colson Wheels + 2x 6" VEX Omni wheels
2019 - 6" Colson Wheels
No serious complaints about any of these three options. W tread VersaWheels will wear quickly and should be replaced periodically, so design your drivetrain accordingly. But their performance is terrific. Colson wheels have very low wear patterns, but can potentially pick up HPDE if they loose traction and “burn out” on HDPE. Depending on the size, you may also have to machine or purchase a hub for Colson wheels (VEX sells live hub Colsons up to 4" diameter). Inflation in pneumatic wheels is a variable to play with.