OpenCycleMap is the award-winning world-wide map for cyclists. Andy started making this map in 2007 and now it’s used in hundreds of applications and websites. You can use it too.

Use this style

Want to use these tiles? The generic tile format string for the OpenCycleMap layer is:{z}/{x}/{y}.png?apikey=<insert-your-apikey-here>

I have documentation on the tile layer format. For more details on using this with various libraries, check out the tutorials.