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1-2km/h average speed difference is far too small to make a conclusion from, especially when it's usually depend whether you're on form or not.
edscoble-
I ride with my housemate quite a lot. He used to exclusively ride his Dawes Galaxy with 32c Marathon Plus tyres. I'd basically be on the front the whole ride. Then he went out and got a carbon fancy and fuck me, I could hardly keep up. Massive difference in top speed and acceleration.
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That's an average of averages, based on distance, HR and perceived efforts. Don't ask to see my working please ;)
TurtleRecall
bashthebox
I'd agree with you for the differences in speeds on the commute, but on the open road that's simply nonsense. I get a 1-2kph ave speed difference between two different carbon bikes, with a 1kg ish weight difference - main difference between them being the winter and summer tyres, I guess. So the difference between a massive heavy steel beast and a carbon speedy will be huge, especially when the road goes uphill.