a man on Chevrolet bike

[English]
At a signal on the way to the Chichibunomiya Rugby Stadium, the man appeared. He was on a little bit rusty Chevrolet MTB, seemed over 50 and was smoking on the bike, not looked like serious cyclist. His padaling was so slow that I thought I would pass him soon. He was about 10m in front of me. 3 minutes passed, I saw his back. 5 minutes passed, I saw his back. 10 minutes passed, I still saw his back. He was pedaling slowly. "Why I cannot pass him?" I watched his bike. Tires, pedals and bar ends were customized. "Is he (or was he) some kind of professional?" 15 minutes passed, .... I was seeing his back and slow pedaling, and could not pass him untill we were apart our way.
Who was he?


[Japanese 日本語]
秩父宮ラグビー場へ向かう途中、中原街道のとある交差点でそのオヤジは忽然と私の前に現れた。少し錆びの出たシボレーのMTBに跨り、タバコをくわえた５０過ぎと思われるその風体は再燃しだしたといわれるチャリブームとは縁遠く、増してとても”走り屋”には見えなかった。ゆっくりとペダリングする彼の姿は私の１０ｍ程度先に見えた。3分が過ぎ、5分、10分が過ぎた。依然私は彼の背中を見ていた。「おかしい！？どーしておいつかないんだっ！？」よーく見ると彼のチャリはタイヤとペダルとバーエンドがカスタマイズされていた。「ひょっとしてその筋のヒトか？」15分が過ぎ、私は依然彼の背中とそのゆっくりとしたペダリングを見続け、結局道が分かれるまで彼に追いつくことはできなかった（（注）といって引き離されたわけでもない）。
何者だったのだろう？

うーん、世間はやっぱり広い！