At the top it says hub type ,axle type etc doesn't it. Then one column in from the right it says upgrade and conversion options. Under the chart of all the hub specs there is a little box with the upgrade and conversion options listed : 1. Convertible to 135mm one piece axle 2. Convertible to 130mm, 135mm and 140mm axle widths when using a two piece axle 3. Convertible to stainless steel driveshell Then above that in the column that says upgrade and conversion options in the chart, the row that falls on the BMX hub has no numbers listed.