[Doctor_Fegg]

cycle.travel (my site!) is OSM-powered bike routing, including a “n km from start point” feature. Always happy to hear comments and suggestions.

https://cycle.travel/map

[tasuki]

Thank you Richard, https://cycle.travel/ is amazing!

[schoen]

Wow, that's really neat! The suggested routes of a particular length is an awesome feature I've never seen anywhere before.

I also like the street name initials concept -- if you're familiar with the cycling routes in an area, you're likely to recognize them.

[mbirth]

And if you have a motorbike, there’s kurviger.de that tries to find a nice route with lots of bends.

https://kurviger.de/

[dmitriid]

Awesome!

Immediate comment: replace the km slider with an input field :)