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Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

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Old 01-01-13, 05:59 PM   #1
zeb1117
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Tt clinchers vittoria

I'm a poor racer and I'm in the market for some high speed clincher tires for the early season tt's. the vittoria diamanté is marketed as a fast tire and it is also very light. It seems like such a better deal than the Corsa models for a person like me that is looking almost specifically for a fast straight line tire. Can anybody tell me if the diamanté is any slower than the Corsa models in a straight line? I suspect that the price jump for corsas is for handling and ride quality not necessarily rolling resistance.
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Old 01-01-13, 06:44 PM   #2
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Nothing to add about the Diamantes but I just bought a set of Corsa Evo CX's from Velomine for $45 each, about the same price.[h=1][/h]
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Old 01-02-13, 01:57 AM   #3
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One of the fastest and lightest clinchers will be:
Veloflex Corsa 23 at 194 grams measured
Schwalbe Ultremo ZLX at 172 grams measured (race tire only as there is no protection belt)

Both are around $43/tire shipped
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Old 01-02-13, 02:33 AM   #4
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i've got about 1500 miles on a set of 23mm corsa's, and about 1000 on a set of 20mm diamonte's.

corsa tread is soft and cuts easily compared to the diamonte. it also wears faster. perform about equally, but then again i am easily pleased. they are both pretty light.

the diamonte's are slightly less expensive. about 10 per tire.

btw, i've already got a second set of diamonte's ready when the corsa's wear out.
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Old 01-02-13, 12:49 PM   #5
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are the diamantes clinchers at 20c? or tubular? is the 20c comfortable? its just for TT so i suppose i dont care too much about being comfortable.
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Old 01-02-13, 12:59 PM   #6
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Based on this data, the Daimante would appear to be a reasonable choice: http://www.rouesartisanales.com/article-1503651.html

The Diamante rain is just 3 watts worse than the Open Corsa.

However, that data is a bit old now, and tires change.
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Old 01-02-13, 01:12 PM   #7
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Originally Posted by merlinextraligh View Post
Based on this data, the Daimante would appear to be a reasonable choice: http://www.rouesartisanales.com/article-1503651.html

The Diamante rain is just 3 watts worse than the Open Corsa.

However, that data is a bit old now, and tires change.

Thanks for that! very helpful actually even if its a bit old.
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Old 01-02-13, 01:16 PM   #8
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I think i want the diamantes, theyre for sale for 27 each on a website that i use but theyre 25c. According to that link they may actually be faster. hmmm
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Old 01-02-13, 01:19 PM   #9
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I think i want the diamantes, theyre for sale for 27 each on a website that i use but theyre 25c. According to that link they may actually be faster. hmmm
Faster at the same pressure.
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Old 01-02-13, 01:21 PM   #10
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Faster at the same pressure.
do you think the aero dynamics would play a roll? something about my instinct just doesnt want to go 25c, but everybody says its better
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Old 01-02-13, 01:35 PM   #11
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Originally Posted by merlinextraligh View Post
Based on this data, the Daimante would appear to be a reasonable choice: http://www.rouesartisanales.com/article-1503651.html

The Diamante rain is just 3 watts worse than the Open Corsa.

However, that data is a bit old now, and tires change.
Nice chart. After riding EVO Corsas for 2000 miles, I switched back to my trusty GP4000s and they felt sluggish in comparison. I guess it wasn't all in my head.

Bob
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Old 01-02-13, 01:56 PM   #12
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Nice chart. After riding EVO Corsas for 2000 miles, I switched back to my trusty GP4000s and they felt sluggish in comparison. I guess it wasn't all in my head.

Bob
The 4000s test better than the 3000's. There's a german magaizne test where the 4000s came out the winner. http://www.conti-online.com/generato...gp4000s_en.pdf
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Old 01-02-13, 02:02 PM   #13
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do you think the aero dynamics would play a roll? something about my instinct just doesnt want to go 25c, but everybody says its better
For time trials, a 23mm front tire is definitely going to be more aero than a 25mm. The question is whether the difference is more significant than any difference in rolling resistance.



My bet is the aero advantge trumps any rolling resistance advantage, at time trial speeds, no drafting. According to Zipp going from 23mm tires to 25 mm tires on Zipp 808's costs 8 watts of drag per wheel. I doubt you'll save 16 watts in rolling resistance going from 23mm to 255 mm on the same tire.

I've done a fair number of TT's including State and National championship events, and I don't recall seeing anyone running wider tires. In fact on many TT bikes you can't fit 25mm tires.
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Old 01-02-13, 11:18 PM   #14
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The diff of few Watts here and there will make a diff at the top level. If one is below top 20% I'd go for a safe set. 4000S is one but I think it's just safe and nothing else.
This guy likes the Attack/Force combo. Not sure how much we should rely on his opinion but when you check the slowtwitch forum (tri guys) you'll see lots of good comments on Attack/Force. 2013 (not available yet as far as I know) is supposed to be 20 or 30 grams lighter than 2012 - I winder what the drawback is. Attack/Force is inexpensive ($below $75/set) but if rear wears out faster you won't be able to rotate easily.
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Old 01-03-13, 08:53 AM   #15
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The 4000s test better than the 3000's. There's a german magaizne test where the 4000s came out the winner. http://www.conti-online.com/generato...gp4000s_en.pdf
great link. i like the 4000s'. now i can stick to them without a bad conscience and wasting money looking for something better. this testing was an interesting read.
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Old 01-03-13, 11:43 PM   #16
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1) Latex tubes

2) Aero > Crr. The Crr difference in various tires is often smaller than the difference in aerodynamics

3) Google Tony Martin flat tires.
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Old 01-04-13, 07:48 AM   #17
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I ride on continental attack/force on one bike and vittoria open corsa Evocx on the other.

Go to ribble, vittoria's are evocx are $28each and the diamonte are $30.
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Old 01-05-13, 03:00 PM   #18
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How is ribble's shipping? are they out of europe? have you ever ordered from them?
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