From R1 Wurks:
This is our newest laydown top shaft for out DC1 car. This new top shaft is not solid on the gear end of the shaft, providing more durability compared to our OG top shaft that was hollow all the way through.
Wide Pinion Gears (48P)
These are our new Wide Pinion Gears. These are 48 pitch with 5mm shaft hole.
They are 10mm wide.
Sizes Offered: 25, 26, 27, 28, 29, 30, 31
Wide Spur Gears (48P)
These are our new Wide Spur Gears. These offer more durability than your typical narrow spurs. There are all 48 pitch.
These are 7.5mm wide
Sizes Offered: 77, 78, 81, 82, 84, 86, 88