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 Post subject: Re: 23 vs 25 tyre
PostPosted: Thu Mar 30, 2017 9:12 am 
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Joined: Wed Sep 14, 2016 8:51 pm
Posts: 468
Location: RVA,USA
On my aksiums, my 25mm gp4000 s2 are ~28mm at 90psi

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 Post subject: Re: 23 vs 25 tyre
Posted: Thu Mar 30, 2017 9:12 am 


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 Post subject: Re: 23 vs 25 tyre
PostPosted: Thu Mar 30, 2017 11:34 am 
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Joined: Wed Jan 22, 2014 11:48 am
Posts: 2423
Location: Vienna Austria
GP4000s are almost comically wide, 25s are 28mm and 28s are 31mm and will fit almost no bike with caliper brakes.

Do yourself a favor and get a cotton tire - Veloflex or Vittoria, the ride quality is just sooo much better, and they're fast enough too.


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 Post subject: Re: 23 vs 25 tyre
PostPosted: Thu Mar 30, 2017 12:16 pm 
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Joined: Mon Feb 20, 2017 3:47 pm
Posts: 8
Marin wrote:
GP4000s are almost comically wide, 25s are 28mm and 28s are 31mm and will fit almost no bike with caliper brakes.

Do yourself a favor and get a cotton tire - Veloflex or Vittoria, the ride quality is just sooo much better, and they're fast enough too.



Which Veloflex or Vittoria clincher do you recommend? What about their size 25 is 25?
The good thing about GP4000s is millage. I put over 17000 km on my last set? How is it compared to Veloflex or Vittoria?


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 Post subject: Re: 23 vs 25 tyre
PostPosted: Thu Mar 30, 2017 2:33 pm 
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Joined: Tue Aug 04, 2015 3:48 pm
Posts: 172
Only two mms but it actually is over 8 per cent increase in tire width.

It definitely makes a difference especially on a long ride.

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 Post subject: Re: 23 vs 25 tyre
PostPosted: Thu Mar 30, 2017 3:09 pm 
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Joined: Wed Jan 22, 2014 11:48 am
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Location: Vienna Austria
marshalus wrote:
Which Veloflex or Vittoria clincher do you recommend? What about their size 25 is 25?
The good thing about GP4000s is millage. I put over 17000 km on my last set? How is it compared to Veloflex or Vittoria?


Vittoria Corsa G+ 23s will measure 25mm, 25s are 27mm.

Veloflex Master/Corsa 23s and 25s are true to size i.e. 2mm narrower than Vittorias. I have multiple sets of both and think both are excellent. Veloflex are much lighter and a quite a bit cheaper.


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 Post subject: 23 vs 25 tyre
PostPosted: Thu Mar 30, 2017 7:11 pm 
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Joined: Fri Oct 30, 2009 10:36 pm
Posts: 725
Is Veloflex still not recommending use of their tires on carbon clincher rims?
I have found that the Vredestein Fortezza Senso All Weather 25mm clinchers to measure the narrowest on 17c internal width rims. Mine measure 26mm on my Bora One 35 clinchers. They did not score well on the rolling resistance test though.


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Last edited by fogman on Thu Mar 30, 2017 7:11 pm, edited 1 time in total.

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 Post subject: Re: 23 vs 25 tyre
PostPosted: Thu Mar 30, 2017 8:05 pm 
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Joined: Sun Nov 07, 2010 9:14 pm
Posts: 4746
fogman wrote:
Is Veloflex still not recommending use of their tires on carbon rims?

I think so. I don't use the Veloflex clinchers, but I've seen some getting torn up with the Vision carbon rims that a friend sells. Regardless of what clinchers you're using, it's a good idea to check to see how sharp the inside of the bead edge is on your carbon rims. Some are smoother than others. Continental has a warning about that as well. Yet the Conti 4000Sii's have not seemed to suffer the same fate on the same wheels.

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