fat bike front hub, Disc Brake type. 135mm o.l.d. 3/8" 36 hole all steel. Hello, this hub is a very good replacement for 26" x 4" also 20"x4" fat bike hubs. We have used them many times for customers with great results! The bearings are factory torqued, ball and cup design and feel very tight when new, they will break-in GREAT! Please check the photos for measurements for proper fit. 🇺🇲 All our parts are inspected, packed, and shipped in the USA. We love testing products! https://youtu.be/SSz2Y7xhQmc Thank you, Sincerely, Dennis Record