How Fast?
08-14-16, 12:35 PM
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How Fast?
All things being equal, how much faster can one expect to be when switching from a Trek Crossrip (32mm tires) to say a Trek Madone road bike?
08-14-16, 12:53 PM
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Biggest difference will be the tires, assuming the same position on the bike. You can just run 25mm tires on the cross rip and see if you notice a difference. It's not going to be very much.
08-14-16, 01:11 PM
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Agree.
08-14-16, 02:04 PM
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Not exactly a scientifically viable sample, as it's one guy doing the same test twice, but here's a repeated segment I cover when
doing my FTP test: 3.9 miles, climbing 508ft.
Top section, Michelin Pro4 Endurance 700x28, avg. pwr. 338W
Bottom section, Maxxis Re-Fuse 700x32 TR, avg. pwr. 338W
At the same power (the things like HR and cadence don't really matter) the Maxxis carried me to the top 47 seconds faster, despite being wider and running about 15 less psi.
The takeaway is that thinner tires or lighter bikes won't affect your speed so much as better tires will.
doing my FTP test: 3.9 miles, climbing 508ft.
Top section, Michelin Pro4 Endurance 700x28, avg. pwr. 338W
Bottom section, Maxxis Re-Fuse 700x32 TR, avg. pwr. 338W
At the same power (the things like HR and cadence don't really matter) the Maxxis carried me to the top 47 seconds faster, despite being wider and running about 15 less psi.
The takeaway is that thinner tires or lighter bikes won't affect your speed so much as better tires will.
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08-14-16, 02:59 PM
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08-14-16, 03:23 PM
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Tire style is going to be a much larger difference than width. Supple slicks roll noticeably better on pavement than tough semi-slicks. 32 vs 25 is a toss-up where the differences are usually pretty small, and not always in favor of the 25.
08-14-16, 03:28 PM
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One thing to not forget is that although the wider tires allow for lower PSI and lower rolling resistance (say a 23 vs 28), wider tires are also less aerodynamic. That being said, I'd prefer to ride 28s on all my bikes if my frames would allow it.
08-14-16, 03:32 PM
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I have a Canondale SuperX which is similar to the CrossFit and a Emonda which is similar to the Madone.
I'm about 1mph slower on the SuperX.
But they are apples and oranges. The SuperX has Sram Rival CX1 with 32mm tires and weighs 21lbs. The Emonda has Sram eTap with 25mm tires and weighs 14lbs.
I'm about 1mph slower on the SuperX.
But they are apples and oranges. The SuperX has Sram Rival CX1 with 32mm tires and weighs 21lbs. The Emonda has Sram eTap with 25mm tires and weighs 14lbs.
08-15-16, 09:57 AM
#16
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I have a Canondale SuperX which is similar to the CrossFit and a Emonda which is similar to the Madone.
I'm about 1mph slower on the SuperX.
But they are apples and oranges. The SuperX has Sram Rival CX1 with 32mm tires and weighs 21lbs. The Emonda has Sram eTap with 25mm tires and weighs 14lbs.
I'm about 1mph slower on the SuperX.
But they are apples and oranges. The SuperX has Sram Rival CX1 with 32mm tires and weighs 21lbs. The Emonda has Sram eTap with 25mm tires and weighs 14lbs.
6lbs won't account for one MPH. If it did, I'd lose 60lbs and be riding around at 30mph.
Different groupsets wont affect speed unless you are spinning out, or running out of gears on climbs.
That leaves the tires and your position on the different bikes.
If you gain speed on the Emonda, I'd wager that most of the speed you gain is due to a more aerodynamic position and has nothing to do with groupset, weight, and little to do with tires.
08-15-16, 10:02 AM
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I have a CAADX and a Giant Defy Advanced 2. I did a run this weekend on the same circuit than before. My last recorded run was still faster on my CAADX than my Giant.
08-15-16, 10:05 AM
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Speaking of apples and oranges...
6lbs won't account for one MPH. If it did, I'd lose 60lbs and be riding around at 30mph.
Different groupsets wont affect speed unless you are spinning out, or running out of gears on climbs.
That leaves the tires and your position on the different bikes.
If you gain speed on the Emonda, I'd wager that most of the speed you gain is due to a more aerodynamic position and has nothing to do with groupset, weight, and little to do with tires.
6lbs won't account for one MPH. If it did, I'd lose 60lbs and be riding around at 30mph.
Different groupsets wont affect speed unless you are spinning out, or running out of gears on climbs.
That leaves the tires and your position on the different bikes.
If you gain speed on the Emonda, I'd wager that most of the speed you gain is due to a more aerodynamic position and has nothing to do with groupset, weight, and little to do with tires.
The Emonda has more gear choices so my cadence will be in my "sweet spot" for the majority of the time.
The weight is noticeable when accelerating.
The two bikes serve different purposes, the Emonda is my road bike and the SuperX is my "foul weather".
08-15-16, 10:10 AM
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08-15-16, 10:14 AM
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I'm guessing anywhere from a .5 to 1 mph bump (based on a comparison between my cross bike and my Pinarello). I do, however, disagree with those who do not believe 1 mph is significant. It probably won't feel too much different. However, in terms of distance over an hour it is significant. If Rider A averages 18 mph and Rider B averages 17 mph in a 1 hour race Rider A will finish 5280 feet ahead of Rider B. If you were to watch this race most would think that Rider B got waxed. We are talking about a win by almost 18 football fields (sans endzones).
08-15-16, 04:12 PM
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