Challenge Criterium RS

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George46GR
Posts: 245
Joined: Thu Aug 15, 2019 5:05 pm
Location: Greece

by George46GR

Dear friend @208, please let's forget the rim issue. Let us assume what we have the two tyres next to each other, the 27mm and the 28mm, just out if the box. Just the two tyres.

Is the 28mm any different than the 27mm? What is normal to my understanding, is that the 28mm is a new and (slightly) wider tyre than the 27mm, actually 1 mm wider. Al least in nomimal values. If one measures them with a caliper, is he going to conclude that the 28mm is 1mm wider than the 27 mm? Is it slightly heavier (a couple of grams maybe)? Period. Regardless the wheel it is going to be installed on.

Kind regards, George.
2023 Cervelo S5, size 56, sapphire/ice

208
Posts: 341
Joined: Wed Apr 26, 2023 6:57 pm

by 208

George46GR wrote:
Sun Dec 10, 2023 5:06 pm
Dear friend @208, please let's forget the rim issue. Let us assume what we have the two tyres next to each other, the 27mm and the 28mm, just out if the box. Just the two tyres.

Is the 28mm any different than the 27mm? What is normal to my understanding, is that the 28mm is a new and (slightly) wider tyre than the 27mm, actually 1 mm wider. Al least in nomimal values. If one measures them with a caliper, is he going to conclude that the 28mm is 1mm wider than the 27 mm? Is it slightly heavier (a couple of grams maybe)? Period. Regardless the wheel it is going to be installed on.

Kind regards, George.
When they are both installed on a 19mm internal width rim, the 28mm is 1mm wider than the 27mm. This rim is specified at 19mm internal to keep it consistent and that is their recommended internal rim width for the 27 and 28s. I can only repeat what they said about the differences, which is above. I wouldn't think too much about it. It's 1mm wider when all things are held constant (which includes a 19mm internal width rim).

I can ask them specifically about the compound and weight.

by Weenie


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George46GR
Posts: 245
Joined: Thu Aug 15, 2019 5:05 pm
Location: Greece

by George46GR

Not a big deal dear @208. My next order will concenr a 28mm (front) / 30mm (rear) combination for my Farsports Hyper (24/30) wheels. BR, George.
2023 Cervelo S5, size 56, sapphire/ice

208
Posts: 341
Joined: Wed Apr 26, 2023 6:57 pm

by 208

George46GR wrote:
Mon Dec 11, 2023 5:10 pm
Not a big deal dear @208. My next order will concenr a 28mm (front) / 30mm (rear) combination for my Farsports Hyper (24/30) wheels. BR, George.
The compound is the exact same.

Yep I'm ordering the same for similar farsports wheels also!

George46GR
Posts: 245
Joined: Thu Aug 15, 2019 5:05 pm
Location: Greece

by George46GR

Already 2,800 km on the RS tyres (tan, 27mm) and they look like new. Brilliant tyres.
2023 Cervelo S5, size 56, sapphire/ice

George46GR
Posts: 245
Joined: Thu Aug 15, 2019 5:05 pm
Location: Greece

by George46GR

Today I received both the RS 27mm and 28mm. Funny thing, but the 28mm (252.6 gr) is lighter than the 27mm (261.5 gr). Yet, the 28mm seems to be 1mm wider than the 27 mm (as expected). I will inform about the true widhts when installed and inflated (not is the near future though).
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2023 Cervelo S5, size 56, sapphire/ice

Mocs123
Posts: 894
Joined: Tue May 11, 2021 9:19 pm

by Mocs123

I had my Challenge Criterium RS 27 tire seperate today on a ride - loud pop, sound of air escaping. It did seal pretty quickly using Challenge's own sealant. Tires have 790 miles on them (~1271km) - all in the dry as I have a seperate wet weather bike. I managed to get home (~30km) just fine, but I assume these are not safe to ride for a few days until I get new tires in or ride my rain bike on the group ride tomorrow and Monday.
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2015 Wilier Zero.7 Rim - 6.37kg
2020 Trek Emonda SLR-7 Disc - 6.86kg
2023 Specialized SL7 - 7.18kg

BikeTyson
Posts: 704
Joined: Fri Oct 15, 2021 3:16 pm

by BikeTyson

Mocs123 wrote:
Fri Feb 16, 2024 9:56 pm
I had my Challenge Criterium RS 27 tire seperate today on a ride - loud pop, sound of air escaping. It did seal pretty quickly using Challenge's own sealant. Tires have 790 miles on them (~1271km) - all in the dry as I have a seperate wet weather bike. I managed to get home (~30km) just fine, but I assume these are not safe to ride for a few days until I get new tires in or ride my rain bike on the group ride tomorrow and Monday.
Reach out the Challenge. That looks like a faulty tire not a puncture.

ViperFFM
Posts: 369
Joined: Wed Sep 02, 2020 11:11 am
Location: Frankfurt am Main,DE

by ViperFFM

Yup thats a warranty claim
carbonLORD wrote:
Fri Mar 12, 2021 12:23 am
I'm a CAT 3 Masters racer, not a dentist.

Luften
Posts: 141
Joined: Thu Sep 13, 2012 11:31 pm

by Luften

Yoln wrote:
Wed Mar 08, 2023 10:27 pm
Basically identical RR to Michel Power Cup, and .7 to .9W higher than GP5k depending on the version at 80psi


Image
Would you mind also posting the Wet Grip Center/Edge data? Also for the Veloflex Corsa Race and Vittoria Corsa to compare?

Thank you.

RDY
Posts: 2587
Joined: Thu Jul 30, 2020 10:31 pm

by RDY

Luften wrote:
Thu Apr 18, 2024 9:54 pm
Yoln wrote:
Wed Mar 08, 2023 10:27 pm
Basically identical RR to Michel Power Cup, and .7 to .9W higher than GP5k depending on the version at 80psi


Image
Would you mind also posting the Wet Grip Center/Edge data? Also for the Veloflex Corsa Race and Vittoria Corsa to compare?

Thank you.
The site that you find so useful is funded by people paying for access to the 'pro' data, and it costs almost nothing ($0.79).

Luften
Posts: 141
Joined: Thu Sep 13, 2012 11:31 pm

by Luften

RDY wrote:
Thu Apr 18, 2024 11:28 pm
The site that you find so useful is funded by people paying for access to the 'pro' data, and it costs almost nothing ($0.79).
Well, that would be per month.. for two years. It's still not a lot of money, but the math is missing a couple of multiplication signs.

Anyway, I'm not a disciple of the site, otherwise I would subscribe. I was curious because I actually have a theory that their edge grip test doesn't work particularly well. If the tire is the same compound all the way along the tread, then the edge test as compared to the center test is really just a test of the tread pattern rather than the compound. And they're testing with a relatively smooth ceramic tile, which I think is going to favour slick tires rather than those which have a lot of tread pattern to them, like the Criterium RS.

But asphalt is not smooth at all, it's full of "holes". So I'm wondering whether tires like the Criterium RS which have lots of side tread will perform better when on asphalt in real world conditions. My untested theory is that the slick tires will suffer vs the test, because they'll have less surface area to contact with, and the tires with tread patterns will improve vs the test, because the tread will be able to stick into the holes in the asphalt and add mechanical grip on top of the grip from the rubber compound.

I'm not a tire engineer though, and none of this is tested, so I'd be interested in people's opinions... How have tires you have ridden performed in your opinion, versus the results of the test? Is the Criterium RS really that bad for edge grip in real world conditions?

BigBoyND
Posts: 1561
Joined: Mon May 31, 2021 1:51 am

by BigBoyND

RDY wrote:
Thu Apr 18, 2024 11:28 pm
The site that you find so useful is funded by people paying for access to the 'pro' data, and it costs almost nothing ($0.79).
x2

Also, if more roadies sign up, the more votes we can get for 28-32mm tires.

Ytse
Posts: 342
Joined: Thu May 05, 2022 11:53 am

by Ytse

For those who are interested: Criterium RS will be available in 30mm version at the end of June - confirmed by the company's customer support.
2020 Scott Addict RC / 2023 Specialized Tarmac SL8

by Weenie


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RDY
Posts: 2587
Joined: Thu Jul 30, 2020 10:31 pm

by RDY

Ytse wrote:
Thu May 09, 2024 12:37 pm
For those who are interested: Criterium RS will be available in 30mm version at the end of June - confirmed by the company's customer support.
Hopefully a 32 or 33 isn't too far off. The 27 (or latterly 28) are a bit small relative to Contis or Tufos for me to consider it.

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