New Old Stock Trivelox Model B 3 speed Rear Derailleur & hub kit Extremely Rare Picture from a Brown Brothers 1938 catalog (not included but shown for reference) Comes with Shifter, cable Guide, & Pulley this kit is complete in the very tattered box, ONLY WHAT IS SHOWN IS INCLUDED OLN (spacing) is 114-115mm Has an odd hole count or 20 0n drive side 10 slotted on the non drive side. Late 1930's to mid 40's Has some mild Shop wear from storage, Very Mild Very obscure, great if you want something different get this one, have only seen a couple ever Box is now taped together, Visit My Pricetronic Store: for thousands of new old stock, vintage and modern bicycle parts. We're the online bike parts dealer for rare components and spare parts for your restoration and repair. Here you will find original pieces of cycling history that cannot be found anywhere else. Please use at your own risk . We decline liability for any damages resulting from use of these items, most of which are decades old Vintage NOS Bicycle Parts is an environmentally friendly business. We use recycled packaging & materials the large majority of the time and nothing in our store has been manufactured for us or is currently being made for sale. International Customers you are responsible for paying your countries customs duties. We will not declare a lower value on customs documents.