Hong Kong cyclist Yang Qianyu on Wednesday took gold by the narrowest of margins in the women's road race, holding off a late surge from South Korean rider Na Ah-reum who took silver.

The distance between the two riders front wheels seemed imperceptible as they crossed the finish line, with both recording a time of 3 hours 36 minutes and seven seconds.

But, after a delay to the announcement of the final results, the gold medal was awarded to Yang with the silver going to Na.

The race for bronze was just as tight, with as many as 18 riders chasing the front two. But the bronze was eventually awarded to Thailand's Jutatip Maneephan.

The medal was Hong Kong's 7th gold and 47th overall at this year's Asian Games, taking the SAR past the record of 46 won at the 2018 Games in Jakarta.

This was also Yang's third medal at the tournament, having won a silver in the madison event in the velodrome and a bronze in team pursuit last week.

"I feel...it feels like I'm dreaming. All I can say is that, my sporting career is now complete," an emotional Yang told HOY TV after the race.

"If you say the first day's team pursuit we were giving it a try, then [for the madison] on the second day we were prepared. For today, I feel my life is complete."