37-inch bottom bracket shells

The Shimano HollowTech II bottom bracket assembly set includes left and right hand cups

REAR HUB: Alloy Body

CRANKS: 3-piece Chromoly 170mm tubular with pinch bolt

Ideal for Children who are want to learn to ride but are finding pedalling prohibative

Stay Strong Optimum STR BMX Bike Colour:Matt Pastel Mint 37-inch bottom bracket shellsMade predominantly for Street riding, the Optimium from Stay Strong features everything you need to hit the streets with confidence. Firstly the Optimum is spec'd out with exclusively sealed bearings meaning that everything is solid, lightweight and requires minimal maintenance. This Model features a fully sealed 9t cassette and 2 piece bars making it perfect for street, park and anything else you can throw at it (if you want a pure street bike check