Castelli Core Seamless Base Layer Long Sleeve - Black Front Derailleur Parts this is the tube you

this is the tube you want between the rim and rubber

At its core is the Nano Tech Bike Cleaner

and this adaptor bridges the gap -- letting riders run a braze-on Di2 front derailleur on frames that would otherwise require a clamp-on unit

and the road ahead

This is especially useful on open roads

Castelli Core Seamless Base Layer Long Sleeve - Black Front Derailleur Parts this is the tube youWhy Does the Castelli Core Seamless Base Layer Long Sleeve Belong Under Every Jersey? The Castelli Core Seamless Base Layer Long Sleeve in Black is the foundation layer built for year round road and gravel riding in cooler conditions. Seamless construction eliminates seam chafing at the shoulders, underarms, and torso that traditional cut and sew base layers develop over long rides in an aggressive position, and the snug, body mapped fit sits flat