Chris King Bottom Bracket Press Fit 30 Warmer The RX4+ caliper supersedes the Wolf Tooth Components The RX4+ caliper supersedes the RX4 caliper and builds on 25 years’ experience designing and manufacturing hydraulic disc brakes and transfers the knowledge and skills acquired into the world of Road and Cyclocross dropbar brakes Bike Protect doesn’t just disperse water after you’ve given your bike a good clean Our Press Fit 30 bottom bracket is machined to aerospace level tolerances to ensure that your bike has the precision fit that you have come to expect from Chris King’s legendary components Each Press Fit 30 bottom bracket includes our exclusive fully serviceable made in house bearings that integrate with our easy to use grease injection system to create a bottom bracket with unparalleled performance and durability