25 kph on a hybrid on a flat road with no wind is probably a power of around 130 W. (clearly the road race route involves hills so would require a higher power to average the same speed)
25 kph on a typical racing bike wearing a skinsuit is probably only around 100 W . You save maybe 15 W in reduced rolling resistance and maybe 20 W in reduced drag. I don't know how much better still the top professionals achieve.
Put the other way, your power output of 130 W would deliver only a modest increase to 28 kph on a racing bike.
Bradley Wiggins, I understand, routinely outputs over 400 W for a whole ride and can sustain nearer 500 W for significant periods (the world hour record on the track is also about 500W). Sprints involve nearer a kilowatt.
Better bikes help us go faster but not that much. The sad fact is that most people who cycle faster than we do do so not because they have a better bike, as we like to delude ourselves, but because they are fitter than us.
(calculations performed using Chris Juden's excellent Excel spreadsheet available on the CTC website)
