Speed Difference between a Specialized Sirrus Hybrid and a Cervelo S2?

[bahamas]

I would be fascinated to hear the forums thoughts on the speed difference a cyclist would see between the two bikes. Both in avg speed and over say a 40-50 mile ride.

 

[T.M.H.N.E.T]

Substantial,depending on rider

 

[gavroche]

Depends on the engine.

 

[Mr Haematocrit]

I would be fascinated to hear the forums thoughts on the speed difference a cyclist would see between the two bikes. Both in avg speed and over say a 40-50 mile ride.

I would have thought that if the course was along a canal towpath, through some woodland, across cobble stones or up steep hills the Sirrus Hybrid may have a higher general pace and therefore be quicker else where the S2 may likely be quicker.
Your simply comparing apples to pears they are totally different kinds of bikes, with different virtues. It's like asking what is faster my Venge or my Epic MTB but setting no rules regarding the course or environment Nobody can give you a decent answer.

The Sirrus has models in the range which come with a triple and lower gearing than the Venge as such I would climb steep hills on it easier and faster. On the descent of the hill the Venge would be faster.

You would be better off comparing the S2 to other aero road bikes like the Venge, Foil, AR2 to name but a few.

 

[bahamas]

My question was more to the benefit of aerodynamics and weight of the bike on the increase in speed on a flat course. Obviously the benefit from a more aerodynamic riding position on the road bike should improve performance. In addition the decreased weight of the bike and more aerodynamic design should improve performance. My question is by how much? I would also imagine thinner tires might also improve performance. Given that what would be the improvement? On average.

 

[palinurus]

Do you happen to have a Specialized Sirrus and a Cervelo S2?

 

[bahamas]

I have a Sirrus and will buy an S2. But say it was a Venge or Trek Madone or the S2. What would the benefit be on average

 

[Herzog]

I reckon about 9.92128 kph...

I have a Sirrus and will buy an S2. But say it was a Venge or Trek Madone or the S2. What would the benefit be on average

 

[Rob3rt]

If you remove the main factor, i.e. rider position and then compare savings on the frame only. The savings would be substantial in a race situation if you happened to go on a break or were racing a time trial (where anything over a few W is substantial), however in an everyday situation of any time gain would be eliminated by the 1st red light you happened to hit that day.

 

[Soltydog]

Depends on a number of factors, but my ave speed tends to be about 3-4mph quicker on a road bike compared to a hybrid over the same or similar routes. The Sirrus is a more 'sportier' hybrid than mine though, so you may not notice as much increase??

 

[Rob3rt]

Depends on a number of factors, but my ave speed tends to be about 3-4mph quicker on a road bike compared to a hybrid over the same or similar routes. The Sirrus is a more 'sportier' hybrid than mine though, so you may not notice as much increase??

That would mostly be down to riding position.

 

[Soltydog]

That would mostly be down to riding position.

Mostly, but other differences include gearing, tyres & luggage. On my hybrid I tend to always have a pannier on, but just a saddle pack on my road bike. My tourer & road bike are similar riding positions, but still about 2mph average quicker on the road bike

 

[palinurus]

Too many variables, you could carry out a number of timed runs on each bike in a randomised order and see if you can estimate the benefit that way.

I'd guess the rider would be quite influential e.g. less powerful riders may get more benefit from aerodynamics on a flat course.

I took around a minute off my time on a flattish 10 mile TT course going from a basic road bike to a fairly basic TT bike (both with similar road wheels, no discs), but that probably applies just to me at that particular time.

 

[montage]

Buy the S2 and tell us.

 

[Kies]

I have a sirrus hybrid running on 23c road slicks and a Giant Defy, so close enough for the comparison.
The longest regular training loop i have used both bikes on is 22.5 miles and the difference in average speed was around 2.5 - 3 mph.I wouldn't put this down to just the bike (weight) and the aero position, as I tend to try harder on the road bike, where as the hybrid is my cruiser, due to it's relaxed riding position.