Adjectives for a bicycle, depending on context:
General:
* Classic
* Vintage
* Stylish
* Modern
* Durable
* Reliable
* Lightweight
* Comfortable
* Practical
* Versatile
* Fast
* Smooth
* Sleek
* Shiny
* Bright
* Colorful
* Striking
Specific:
* Mountain
* Road
* Hybrid
* Folding
* Electric
* Cruiser
* Fixed-gear
* Tandem
* Recumbent
Descriptive:
* Rusty
* Dented
* Used
* Second-hand
* New
* Customized
* Personalized
* Handmade
* High-end
* Budget-friendly
* Heavy
* Clunky
* Loud
Emotional:
* Beloved
* Cherished
* Trusty
* Faithful
* Joyful
* Freedom-giving
* Adventure-seeking
Figurative:
* Whimsical
* Ethereal
* Fluid
* Dynamic
The best adjectives to use will depend on the specific bicycle and the context you are describing it in.