Legendary Oak Wheels from Porto, Portugal. Oaks have an extremely unique urethane material unlike any other wheel on the market. They are dense, "thumpy", and have a perfect grip to them. 

• Radial shape
• 7.5 mm x 4,5mm - size between M and RV2
• Off-center bearing more towards axle- Axle nuts sits fully within wheel
• Flat curve on inside edge for Lock-Ins