Whilst grinding on the BB shell of your frame is cool, they're not designed for grinding. The BB Buddy is a replacement non-drive bottom bracket spacer made for abuse and will give your frame some added protection. It sits at a slightly bigger diameter than your bottom bracket shell and is made out of post heat treated 4140 (the same stuff as a decent metal peg); this glorified washer will slide grinds faster and lock in better, ensuring your BB bearings won't melt to dust. 4140 post heat treated chromoly CNC Machined by an ageing BMXer in post-Brexit Britain Available in 19mm, 22mm and 24mm Size: 24mm, 19mm, 22mm