One question we get all the time around at Profile is "I have a Profile Mini Hub with a 14mm axle, can I put the 3/8 Female axle into it?" The answer is YES! No matter which Profile BMX hub you have, you can switch from the 14mm axle to the 3/8 Female axle, or vice versa. All you need to purchase is the conversion kit- they have everything you need to switch from one to the other.