What is at the heart of modern cycling? (6)

I believe the answer is:

centre

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'heart of modern cycling?' is the definition.
'centre' can be an answer for 'heart' (synonyms). I'm not sure about the 'of modern cycling?' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for centre that I've seen before include "focus" , "Player" , "Nucleus" , "The point equidistant from everything" , "Point equidistant from all other points" .)

I've seen this clue in The Independent.

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