How fast is that on a bike?

Cycling speed is almost entirely a fight with air. Above about 25 km/h, most of your effort goes into moving air aside.

Your speed Unit

89% of a club rider

25 km/h is faster than 3 of the 7 references on this page.

Reference figures are measurements and are rounded; the unit conversion behind them is exact.

Every reference on this page, with its size and its ratio to your number
Reference	Size	Yours ÷ theirs	Note
leisurely ride	13 km/h	1.93×	13 km/h
city commuter	15.8 km/h	1.58×	16 km/h
fit recreational rider	22 km/h	1.14×	22 km/h
club rider	28.1 km/h	0.89×	28 km/h
Tour de France average	40.7 km/h	0.615×	40.6 km/h over three weeks
hour record	56.8 km/h	0.44×	56.79 km in one hour
recumbent streamliner record	145 km/h	0.172×	144.17 km/h

At 30 km/h roughly 80% of a cyclist’s power goes into aerodynamic drag. That is why a fairing more than doubles the record.
The Tour de France has averaged over 40 km/h for the whole race since 1999 — including mountains.

Frequently asked

For a fit recreational rider on flat roads, 22–25 km/h. Club riders hold 28–32 in a group, where drafting saves about 30% of the effort.

Because the rider in front leaves a pocket of moving air behind them. Sitting in it cuts drag by 25–40%, which at racing speed is most of the work.