Shimano Ultegra RX rear derailleur
$150 (mechanical), $380 (electronic), bike.shimano.com
In the midst of the Cobbled Classics, Shimano released it new rear derailleur, the Ultegra RX. The “RX” is for “road crossover.” In this case, it’s a familiar migration of late: mountain bike tech heading to the road. Shimano brought its Shadow RD Plus technology to this derailleur, which reduces chain slap and dropped chains. A switch engages a stabilizer increasing spring force in the mech, so your rides down gravel roads should have smooth, consistent shifting.