Blackspire Dewlie Chain GuideThe idea has been copied by those Taiwanese guys. But its unparalleled performance has yet to be matched. The DEWLIE has been the world's number 1 Dual-ring Shift guide since Blackspire introduced it in 2000. Virtually maintenance free and super easy to setup this guide is your new best friend!
|Mount Type||Bottom Bracket|
|Bolt Pattern (BCD)||104mm, 4-Arm|
|Max Chainring Size||34T|
|Chainring Compatability||Dual Chainring|