The 250 Series Kit is for the rider who wants to get outside and ride as soon as possible. The 250 Series Kit is simple, reliable, and will give you ample power to speed up hills with very little effort! The 250 Series Kit features our hassle-free 5 minute install so you’ll be able to transform your current bicycle in just five minutes. Each kit is hand built in the USA customized for each order! If you need help determining what sizes and options you need please give us a call at (866)933-8716! At Leeds, we pride ourselves on our expertise and customer service.