90 Tooth - Single Threaded Mounting Hole 1-3/4" for #25 Chain Direct replacemnet part from Currie Technologies for your electric scooter. This sprocket comes stock on most Currie, izip, Ezip, GT, Mongoose, & Schwinn Electric Scooters. Generally, these do not need replacing. However, Scooter sprockets can get bent, and make your chain pop off. This 90 Tooth Sprocket will work on any and ALL right side drive Currie Scooters. SD-350 Home | New Arrivals | Nintendo Wii | Playstation 3 | Electric Scooters | Scooter Parts | Electric Bikes | Schwinn Scooters | Ezip Scooters | Xbox 360 | Nintendo 3DS | Tablets | Ipad2 | Tablets | Shipping | FAQ | About Us | Scooter Laws | Warranty & Returns | Show Order