BMX 3-PIECE CRANK UPGRADE KITFOR C1 BMX and other BMX BIKES Transform your Bike, whether it be a CollectiveBikes, another brands bike, or a high end custom BMX, use our quality 3 piece cranks upgrade kit! Making your ride smoother, stronger and lighter. This kit is great for all bikes, as it comes with a sealed Mid bottom bracket bearing (commonly used on high end BMX bikes) and uses 2 cups to make it fit our Bikes and other entry level BMX bikes. Meaning you can use this Kit for