Why are there lines on BoXXer’s upper tubes? BoXXer’s new crown height gradient provides a visual guide to simplify the setup process when positioning the crowns on the upper tubes, no rulers required Related articles Why does the new BoXXer have 38mm upper tubes? What can I upgrade on my 2024 BoXXer to make it more like the BoXXer Ultimate? How do I add ButterCups to my base-level BoXXer? What are the features of BoXXer’s new crowns? Are BoXXer’s wiper seals the same as ZEB’s wiper seals? Can I run ButterCups on one side only?