Using your E*thirteen E*spec Plus Bosch G4 Cx Cranks is straightforward. First, make sure it's properly mounted on your Bosch CX Gen4 or Brose S Mag drive system following the included user manual. When riding, these cranks will give you a smooth pedaling experience thanks to their slim Q factor and low profile. As for maintenance, keep them clean by wiping off dirt and grime after each ride. You can use a mild soap and water solution. Avoid using harsh chemicals as they may damage the 6061 Aluminium material. Check the tightness of the parts regularly to ensure safety. If you notice any unusual noises or looseness, stop using the cranks and check for problems. Remember, the cranks don't have a self - extractor, so be careful when you need to remove them.