manual transmission vs spoke

manual transmission

noun
  • A multi-speed vehicle transmission, where gear changes require the driver to manually select the gears by operating a gear stick and clutch (which is usually a foot pedal for cars, or a hand lever for motorcycles). 

spoke

noun
  • A device for fastening the wheel of a vehicle to prevent it from turning when going downhill. 

  • A projecting handle of a steering wheel. 

  • A support structure that connects the axle or the hub of a wheel to the rim. 

  • A rung of a ladder. 

  • One of the outlying points in a hub-and-spoke model of transportation. 

verb
  • simple past tense of speak 

  • To furnish (a wheel) with spokes. 

How often have the words manual transmission and spoke occurred in a corpus of books? (source: Google Ngram Viewer )