> For the complete documentation index, see [llms.txt](https://docs.velogicfit.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.velogicfit.com/general.md).

# General

- [Velogic's Support Policy](https://docs.velogicfit.com/general/support-policy.md): Velogic's email-first support policy and how to get help
- [Using Bar XY Cartesian Coordinates](https://docs.velogicfit.com/general/bar-xy-coordinates.md): Complete guide to using Bar XY Cartesian coordinates for bike fitting and frame comparison. Learn about Reach and Stack metrics and why Bar XY provides more accurate frame sizing.
- [Downloading statements](https://docs.velogicfit.com/general/downloading-statements.md): If you need detailed statements for your accounting record, you can download these through our website.
- [Changing your credit card](https://docs.velogicfit.com/general/changing-credit-card.md): If your credit card expires, or you need to change the credit card used for your Velogic subscriptions, you can do that yourself easily via our web application.