Here are three of my favourite biking routes in Shenzhen.
1. Shenzhen Bay & Mangrove Wetland (coastal; ~ 7 km; ~1 hour; ONLY weekdays)

运动起来!深圳10条特色骑行线路出炉[Go sports! 10 special biking routes in Shenzhen]. (2018, August 30). Retrieved March 23, 2021, from https://gd.qq.com/a/20180830/055615.htmLinks to an external site.

运动起来!深圳10条特色骑行线路出炉[Go sports! 10 special biking routes in Shenzhen]. (2018, August 30). Retrieved March 23, 2021, from https://gd.qq.com/a/20180830/055615.htmLinks to an external site.

深圳湾红树林骑行攻略 深圳最美的海边路线推荐[Shenzhen Bay - Mangrove biking guide: The most beautiful coastal route in Shenzhen]. (2018, July 20). Retrieved March 23, 2021, from https://www.sohu.com/a/127680056_371624Links to an external site.
2. Wutong Mountain (mountain; ~30 km; ~4 hours)

深圳自行车骑行路线,你骑过这10条路线吗?[Biking routes in Shenzhen: Have you ever cycled on these 10 routes?]. (2018, July 20). Retrieved March 23, 2021, from https://www.sohu.com/a/242266170_99990659Links to an external site.

这,就是深圳最美绿道![This, is the most beautiful greenway in Shenzhen!]. (2020, January 09). Retrieved March 23, 2021, from https://www.sohu.com/a/365914422_355785Links to an external site.

这,就是深圳最美绿道![This, is the most beautiful greenway in Shenzhen!]. (2020, January 09). Retrieved March 23, 2021, from https://www.sohu.com/a/365914422_355785Links to an external site.
3. The OCT (city; ~10 km; ~1 hour)

深圳最美的10条骑行线路,送给热爱骑行的你![10 most beautiful biking routes in Shenzhen: For you who loves biking!]. (2016, April 23). Retrieved March 23, 2021, from https://www.sohu.com/a/71168378_355768Links to an external site.

深圳最美的10条骑行线路,送给热爱骑行的你![10 most beautiful biking routes in Shenzhen: For you who loves biking!]. (2016, April 23). Retrieved March 23, 2021, from https://www.sohu.com/a/71168378_355768Links to an external site.