Cane Creek 40 bottom assembly. Converts 44mm head-tube bottom for use with 1. 5" 40mm crown race forks. Replaces Cane Creek XX-44 headset For use with 1. 5" threadless steerer tube bottom (40mm crown race seat diameter, tapered steerer tube) Converts 44mm head-tube bottom for use with 1. 5" 40mm crown race forks External Cup (EC) 44mm Bottom Assembly enables use of tapered steerer tube External Cup (EC) assemblies feature press-in cups with bearings outside the frame Combine with 44mm 1-1/8" Zero Stack Top Assembly for complete 44mm straight head-tube installation S. H. I. S Lower: EC44 Crown Race: 39. 7 Stack Height: 12 mm Weight: 65 grams | Cane Creek | 40 Ec44/40 Lower Headset | Black | 1. 5 Crown Race, Ec44 Lower Tube