HOT: Active* forum members generally gain 5% discount at starbike.com store!
Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Articles FAQ Contact About




Post new topic Reply to topic  [ 31 posts ] 
Go to page 1, 2, 3  Next
Author Message
PostPosted: Mon Apr 21, 2014 1:56 am 
Offline

Joined: Wed Dec 21, 2011 8:09 pm
Posts: 27
Is the newer clincher version of the Conti GP4000 really an improvement over the older? I heard the sidewalls may be thinner. I need a good race tire that has more puncture protection than the Vittoria Open Corsa which I have had a run of bad luck with. Also is it really true that t 25s are actually faster than 23s?

Thanks for help and suggestions (yes I know I should go tubular but can't afford new wheels right now so looking for best clincher).


Top
 Profile  
 
Posted: Mon Apr 21, 2014 1:56 am 


Top
  
 
PostPosted: Mon Apr 21, 2014 2:27 am 
Offline

Joined: Tue Apr 27, 2010 2:36 am
Posts: 263
I'm a big fan of the 4000S's and as far as I can tell, the only difference between them is that the new II's are available in colors, and a 700x28 width.


Top
 Profile  
 
PostPosted: Mon Apr 21, 2014 3:35 am 
Offline

Joined: Tue Jul 18, 2006 5:18 am
Posts: 588
Location: Cambridge, New Zealand
25s have worse aero and no advantage for rolling resistance. In fact my 25mm GP4000s have markedly worse RR than 23s I've tested (presumably because they made an update and the 25s are from before that). I haven't tested any MkII 25mms - hopefully the construction is standardised so there is no RR penalty.

_________________
http://www.speedtheory.co.nz


Top
 Profile  
 
PostPosted: Mon Apr 21, 2014 3:54 am 
Offline
User avatar

Joined: Sun Nov 07, 2010 9:14 pm
Posts: 1296
I just rode a new set of version 25mm 4000s II's down in Arizona for a week. Don't know what the difference is between the plain 4000s. I used to run 4000s in 23mm. I do not believe the 25's are "faster" than 23's. Guess they're more comfortable by virtue of more air volume however. And I hear what you're saying about the Vittoria Open Corsa CX's. My experience with the Vittorias was that they cut just from looking at them sideways.

_________________
My Colnago C59
My Special Colnago EPQ


Top
 Profile  
 
PostPosted: Mon Apr 21, 2014 4:26 am 
Offline

Joined: Tue Jul 14, 2009 2:18 am
Posts: 210
new colors, new glossy packaging,new wider options - LBS selling USD 2 more.


Top
 Profile  
 
PostPosted: Mon Apr 21, 2014 4:48 am 
Offline

Joined: Tue Jan 22, 2013 6:23 am
Posts: 372
Out of curiosity, are your Vittoria's, Open Corsa I, II, or III? I noticed a big difference in durability (new ones are better) from the original.


Top
 Profile  
 
PostPosted: Mon Apr 21, 2014 6:03 am 
Offline
User avatar

Joined: Wed Feb 23, 2005 6:47 am
Posts: 685
Location: Tucson, AZ
With everyone blowing the GP4000 tires out at ~$38, the new version would have to be pretty amazing to justify a 100% increase in price.


Top
 Profile  
 
PostPosted: Mon Apr 21, 2014 6:20 am 
Offline

Joined: Sat Jul 20, 2013 6:11 pm
Posts: 278
^ can't really compare in that manner... I use the 25's v2... but used v1 in 23.. so no direct comparison. I like the 25's very much.


Top
 Profile  
 
PostPosted: Mon Apr 21, 2014 3:55 pm 
Offline
in the industry
User avatar

Joined: Sun Jul 29, 2012 2:59 pm
Posts: 634
Location: Ruidoso, NM
cyclenutnz wrote:
25s have worse aero and no advantage for rolling resistance. In fact my 25mm GP4000s have markedly worse RR than 23s I've tested (presumably because they made an update and the 25s are from before that). I haven't tested any MkII 25mms - hopefully the construction is standardised so there is no RR penalty.


That's interesting. Should have lower Crr... same casing, tread and everything, just bigger.

What was "updated"?

_________________
formerly rruff...


Top
 Profile  
 
PostPosted: Mon Apr 21, 2014 6:43 pm 
Offline

Joined: Tue Nov 11, 2003 9:47 pm
Posts: 1719
Location: Santa Cruz, California, USA
spookyload wrote:
With everyone blowing the GP4000 tires out at ~$38, the new version would have to be pretty amazing to justify a 100% increase in price.


Note the gp4000 and gp4000s are different tires.


Top
 Profile  
 
PostPosted: Mon Apr 21, 2014 11:31 pm 
Offline

Joined: Fri Sep 03, 2004 2:52 am
Posts: 635
http://www.slowtwitch.com/Products/Thin ... _3946.html


conti's own data proves wider is lower rr.

_________________
Current Rides:

2014 Trek 7.9 PO 9070 di2


Top
 Profile  
 
PostPosted: Tue Apr 22, 2014 1:41 am 
Offline

Joined: Sat Nov 20, 2010 6:06 am
Posts: 758
Location: Perth, Western Australia
I'm with WMW and spartan.
Tour magazine has also tested wider tyres and results show lower rolling resistance.
The pro peleton is moving to 25mm tyres due to lower rolling resistance, another effect is a slightly wider contact patch which provides more grip and they are generally able to run slightly lower pressures which improves comfort.
Sounds like a win/win/win to me.


Sent from my iPad using Tapatalk

_________________
Ozrider - Western Australia
Parlee Z5 XL 2011 (6055g/13.32lbs) Raleigh RC Ltd 2008 (7.6kg) Reynolds 653 Custom 1990 (9.8kg, now 8.8kg)
The accumulation of marginal gains is what makes the difference between winning and losing


Top
 Profile  
 
PostPosted: Tue Apr 22, 2014 2:18 am 
Offline
User avatar

Joined: Wed Mar 06, 2013 4:23 pm
Posts: 340
Location: Austin, TX
You forgot heavier... win/win/win/lose

_________________
My Cervelo R5
My Cervelo S3
My MTB


Top
 Profile  
 
PostPosted: Tue Apr 22, 2014 2:28 am 
Offline
in the industry
User avatar

Joined: Sun Jul 29, 2012 2:59 pm
Posts: 634
Location: Ruidoso, NM
Ozrider wrote:
The pro peleton is moving to 25mm tyres due to lower rolling resistance


The pros all ride tubulars on wide rims. a 25mm tubular is no wider than a 23mm clincher on a wide rim.

Another loser besides weight is aero.

_________________
formerly rruff...


Top
 Profile  
 
Posted: Tue Apr 22, 2014 2:28 am 


Top
  
 
PostPosted: Tue Apr 22, 2014 9:26 pm 
Offline
User avatar

Joined: Sun Nov 07, 2010 9:14 pm
Posts: 1296
I'm curious... There's a lot of stuff out there (mostly marketing) that suggests wider is better, faster, blah blah blah. And people never seem to question it. I'm not sure I believe it all. If a 25 is faster than a 23, I can't seem to tell in the real world, and I've been trying. I have multiple sets of different wheels with different sized tires of the same brand. If I had to say which of my boras were faster between the ones with the 23mm Veloflex Carbons or the set with the 25mm Veloflex Arenbergs at this point I'd say the 23's are faster. The 25's are definitely more comfortable and more stable but for all out speed I gotta say I "think" the 23's would win out.
And even if it's all in my head above, I think it's safe to say that at some point a wider tire will in fact be slower without question simply due to the added friction between tire and road. You wouldn't want to run a motorcycle tire (if it would fit) for instance. As for what pros ride let's be real about the fact that pros ride, for the most part, what their sponsors tell them to ride. And for tubulars at least, I don't think a wider rim bed does squat. Different story for clinchers, admittedly, and from a money making size of martlet perspective, clinchers are where it's at. So it shouldn't be a big surprise that manufacturers want their riders on wider rims if it makes them sell, even though they're still running tubulars. I'll keep testing them out but at the end of the day if I can't experience a real benefit in something then as far as I'm concerned it's all hype.


Sent from my iPhone using Tapatalk

_________________
My Colnago C59
My Special Colnago EPQ


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 31 posts ] 
Go to page 1, 2, 3  Next


Who is online

Users browsing this forum: Baidu [Spider], Bing [Bot], Google [Bot], HillRPete and 33 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Michelin pr4 Endurance 25mm vs Continental GP4000s 25mm?

[ Go to page: 1, 2 ]

in Road

stl516

16

1395

Tue Jul 22, 2014 10:18 am

bikerjulio View the latest post

This topic is locked, you cannot edit posts or make further replies. Shwalbe One clincher

in Road

windsurfingodie

2

506

Tue Mar 18, 2014 7:37 am

Frankie - B View the latest post

There are no new unread posts for this topic. Shimano alu clincher - going wide soon?

in Road

Valy

7

856

Wed Sep 03, 2014 11:42 pm

hmai18 View the latest post

There are no new unread posts for this topic. Clincher Tire Suggestion 700x25?

[ Go to page: 1, 2, 3 ]

in Road

SolidSnake03

40

3392

Sat Nov 23, 2013 4:29 am

RedRacer View the latest post

There are no new unread posts for this topic. 2013 Zipp 303 clincher wheelset

in Road

gianimadrid

3

912

Sat Apr 26, 2014 4:45 pm

yoshirider View the latest post


It is currently Thu Oct 02, 2014 10:38 am

All times are UTC + 1 hour




Advertising   –  FAQ   –  Contact   –  Convert   –  About

© Weight Weenies 2000-2013
hosted by starbike.com


How to get rid of these ads? Just register!


Powered by phpBB