wltoys 144001 MOD 1 Spur Gear. This is a 27 tooth drop in replacement for the original spur gear making it super easy to convert to mod one gearing. They are slightly smaller in diameter so you will notice a small increase in speed depending on your set up. They are 3-D printed using carbon fiber reinforced nylon so they’ll hold up to whatever you can throw at them. fully compatible with stock motor mount using the original bearing and paired with a 22 tooth pinion. These are also drop in replacements for the newer 124019 and 124018. Feel free to let me know if you have any questions. Auction is for spur gear only center shaft and bearings not included. Condition is “New”. Shipped with USPS First Class.