150TW takes a 1/8 in Axle (3mm). Du-Bro Tailwheels are sporty looking and have a machined one piece aluminum hub.  
Used with permission, copyright 2019 Dubro RC/Horizon Hobby, Inc. Copyright 2019 Brey Corp. t/a Hobby Works.
$6 Flat Rate Shipping. FREE Over $199* Most Orders