"track bike" meaning in English

{
  "forms": [
    {
      "form": "track bikes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "track bike (plural track bikes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Bicycle types",
          "orig": "en:Bicycle types",
          "parents": [
            "Cycling",
            "Vehicles",
            "Transport",
            "Machines",
            "All topics",
            "Technology",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A stripped-down, lightweight bicycle, with a fixed gear mechanism and no brakes, designed for racing on a velodrome."
      ],
      "id": "en-track_bike-en-noun-StD~Nl7x",
      "links": [
        [
          "bicycle",
          "bicycle"
        ],
        [
          "fixed gear",
          "fixed gear"
        ],
        [
          "velodrome",
          "velodrome"
        ]
      ],
      "related": [
        {
          "word": "road bike"
        },
        {
          "word": "street bike"
        },
        {
          "word": "track cycling"
        }
      ],
      "synonyms": [
        {
          "word": "track bicycle"
        }
      ],
      "translations": [
        {
          "code": "nl",
          "lang": "Dutch",
          "sense": "bicycle for racing on a velodrome",
          "word": "baanfiets"
        }
      ]
    }
  ],
  "word": "track bike"
}

{
  "forms": [
    {
      "form": "track bikes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "track bike (plural track bikes)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "road bike"
    },
    {
      "word": "street bike"
    },
    {
      "word": "track cycling"
    }
  ],
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        "en:Bicycle types"
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      "glosses": [
        "A stripped-down, lightweight bicycle, with a fixed gear mechanism and no brakes, designed for racing on a velodrome."
      ],
      "links": [
        [
          "bicycle",
          "bicycle"
        ],
        [
          "fixed gear",
          "fixed gear"
        ],
        [
          "velodrome",
          "velodrome"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "track bicycle"
    }
  ],
  "translations": [
    {
      "code": "nl",
      "lang": "Dutch",
      "sense": "bicycle for racing on a velodrome",
      "word": "baanfiets"
    }
  ],
  "word": "track bike"
}