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

BB: Sealed Mid Bottom Bracket

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

37-inch bottom bracket shells

It's one of the highlights of the Subrosa range built with a 4130 chromoly frame

Stay Strong Optimum STR BMX Bike Colour:Matt Pastel Mint CRANKS: 3-piece Chromoly 170mm tubularMade 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