内装変速 21段目

179 ：ツール・ド・名無しさん：2018/07/09(月) 00:10:06.84 ID:8vueTVlx.net

ハウジングで覆えば一応内装・・
Wild CeramicSpeed Driven 13-speed drivetrain concept shifts with no derailleur - Bikerumor
https://bikerumor.com/2018/07/08/wild-ceramicspeed-driven-13-speed-drivetrain-concept-shifts-with-no-derailleur/
https://bikerumor-wpengine.netdna-ssl.com/wp-content/uploads/2018/07/ceramicspeed-concept-drivetrain-with-13-speed-shaft-driven-flat-cassette01.jpg