How do you spell ridelin?

"Rideline" is a misspelling. There are a few possible correct spellings depending on what you mean:

* Ride-line - This is a hyphenated term used in some contexts, like in the phrase "ride-line service."

* Ride line - This is the most common and likely correct spelling.

* Rideline - While it's a possible spelling, it's less common and might be mistaken for a brand or company name.

It would be helpful if you could provide more context about what you're trying to spell so I can give you the most accurate answer.