Kettenrad

Kettenrad mit 6,4mm Bohrung

You only need one motor per side on a tracked vehicle, but you'll need at least one idler wheel to stretch the tread between two points on your robot!

This idler matches the same dimensions as the driver cog (38mm dia x 15mm wide), but is drilled out to 1/4" (6.4mm), which lets you use a standard #8 bolt as the idler axle.