Here are ten words to describe parts of a bike in French.

chain - la chaîne
crossbar - la barre
dynamo - la dynamo
gear - la vitesse
handlebar - le guidon
mudguard - le garde-boue
pedal - la pédale
reflector - le réflecteur
saddle - la selle
spoke - le rayon

To practise these words further, please visit:
https://lexicogs.com/french-for-travel-parts-of-a-bike/