Originally Posted by
AdelaaR
Why do you say "nu budg for a roadie yet"?
This does not make any sense to me.
You can get hybrid bikes from about $150 to $3000 and more.
There is no reason why a roadbike should be more expensive than a hybrid.
Wrong.
For a start the combined brake/shifter units that road racers use cost £150-£350. Good drop handle bars aren't cheap either.
Proper hybrids build for speed can go as fast as roadbikes and do 20MPH+ average speeds.
Yes and no: a hybrid would need drop bars or aerobars to keep up with a roadbike, And even then it would be a disadvantage in a crit or peleton race for reasons you don't need to understand (unless the "hybrid" had started as an exact copy of a road racer with flat bars...)
There are reasons why people don't ride hybrids in races! My cyclocross bike, which is "slow" for a dropbar racer, is still faster than the aluminium and carbon Sirrus I had for a few weeks, although the Sirrus was as fast as hybrids get.
(And why you keep posting strident opinions on technical stuff you obviously don't understand is a puzzle to me - it doesn't help anyone.)
There is also no reason why putting on 28c tyres instead of 32c will make your "buddy" much faster as rolling resistance is only a small factor in the total equation of speed on a bike ... having a good engine and having as little air resistance as comfortably possible are many many times more important than tyres.
Some tyres are slower than others. 28s are not necessarily faster than 32s though - people think they should be because they think tyre drag is frictional, which it isn't. Marathon Sports and Continental Sports Contacts are the obvious tyres to try. Marathon Supremes might be a little shower but would give better grip and puncture protection.
Unless your current tyres are really awful ones I wouldn't expect a speed up of more than 1mph. However, rolling resistance dominates over aero at very low speeds, so your initial acceleration could be quite a lot better.