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General Which tyres for Paris-Roubaix? Whose time trial bike is fastest? Suspension mountain bikes or singlespeeders? Talk equipment here.

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Old 11-04-12, 07:34
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Default Tubs vs clinchers: Clinchers are faster..

GP 4000s faster than any tub out there based on this test by Tour mag in Germany...

http://www.conti-online.com/generato...gp4000s_en.pdf
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Old 11-04-12, 14:04
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Originally Posted by durianrider View Post
GP 4000s faster than any tub out there based on this test by Tour mag in Germany...

http://www.conti-online.com/generato...gp4000s_en.pdf
Not why you use a tubular tire, rolling resistance.
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Old 11-04-12, 14:40
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GP 4000s faster than any tub out there based on this test by Tour mag in Germany...

http://www.conti-online.com/generato...gp4000s_en.pdf
So ..........?
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Old 11-04-12, 18:29
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GP 4000s faster than any tub out there based on this test by Tour mag in Germany...

http://www.conti-online.com/generato...gp4000s_en.pdf
For some reason I thought you were a bike racer. If so, why are you paying any attention to this nonsense?

In a less snarky tone: "rolling resistance" has been shown over and over to be a complete non-issue in competitive cycling--it's all about weight. Compare the weight of a sew-up on a carbon fiber rim to any clincher and you'll see why the pros only ride tubulars.
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Old 11-04-12, 20:05
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For some reason I thought you were a bike racer. If so, why are you paying any attention to this nonsense?

In a less snarky tone: "rolling resistance" has been shown over and over to be a complete non-issue in competitive cycling--it's all about weight. Compare the weight of a sew-up on a carbon fiber rim to any clincher and you'll see why the pros only ride tubulars.
Aren't tubulars supposed to handle better as well?
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Old 11-04-12, 21:41
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Pinch flats are sadface.
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Old 11-04-12, 22:35
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Originally Posted by Wallace View Post
For some reason I thought you were a bike racer. If so, why are you paying any attention to this nonsense?

In a less snarky tone: "rolling resistance" has been shown over and over to be a complete non-issue in competitive cycling--it's all about weight. Compare the weight of a sew-up on a carbon fiber rim to any clincher and you'll see why the pros only ride tubulars.
The tests show a range of nearly 20 Watts at 35 km/hr between different tires. That is a rather huge amount.

Not even for racing, for just hanging with a group of bros, you will be doing a lot more work if you choose the wrong tire.
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Old 11-04-12, 22:56
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Pinch flats are sadface.
I hear they're great in super hot weather on asphalt
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Old 11-05-12, 00:11
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I hear they're great in super hot weather on asphalt
Better than carbon clinchers at least.
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Old 11-05-12, 07:49
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Quote:
Originally Posted by Wallace View Post
In a less snarky tone: "rolling resistance" has been shown over and over to be a complete non-issue in competitive cycling--it's all about weight. Compare the weight of a sew-up on a carbon fiber rim to any clincher and you'll see why the pros only ride tubulars.
What nonsense.

Having said that, tyre weight and rolling resistance are roughly correlated.

Performance of a tyre is a function of many things.

When speed is of primary concern (over say durability, handling, puncture resistance, comfort, cost, ease of use/replacement), then the tyre's rolling resistance (Crr) and its aerodynamics (CdA) are the primary considerations.

Crr is a function of many characteristics, such as tube type, threads per inch, weight, rubber compound, construction, shape, width/profile, and if it's a tubular, how it is glued and what it is glued with. Inflation pressure is an issue as well (and one that's often misunderstood).

Cda is dependent mostly on tyre's width but is also dependent on the rim you choose to ride it with.

Often there is a trade off between the two, and the best rolling tyres may not be the most aerodynamic, and vice versa.

Tyre weight is of little significance to performance (beyond how it relates to Crr). 2 orders of magnitude less important than aero and Crr.


Besides, Pros ride what they are given by the sponsors.

Last edited by Alex Simmons/RST; 11-05-12 at 07:51.
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