Which Tyres?

It's an unusual wear, you could try and speak to the shop you brought them from, but with over 2,000 miles, it's not unusual for tyres to come unbonded from the carcass.

The more I read about these new Corsa's......

I've spoken to sigmasport on Twitter and they've suggested I email them so I'll see if anything comes of it. I was replacing them anyway so I'm not too fussed...

2000 miles on my corsa g+ with at least another 500-1000 on them judging by the wear. Maybe early runs were inconsistent in terms of QC?

28c Gravelkings for fall/winter commuting over 70% tarmac 20% cobbles 10% light gravel?
Frame does not take anything bigger than 28c with guards and want something really grippy.

I'm wavering between 26c and 28c in the Gravel Kings. Want the wider but unsure they will adequately clear my 'guards (SKS Chromo 35). Anyone measured inflated width on a 17mm internal rim?

Riding a 2010 Genesis Equilibrium with Shimano RS500 wheelset.

/boring

Want to use my Caadx on the road for winter, but the Sammy Slicks on there feel bloody slow. What are my options if I want the following:

• Fast-ish
  
• 30-35c, or a 28 that runs big
  
• Cheap-ish
  

kojak, SJS Cycles have some for cheap.

They the same as the ones on CRC, that are a few quid less?

Is it folding?

Edit: yup it is, great value for money!

http://www.chainreactioncycles.com/schwalbe-kojak-slick-tyre-raceguard/rp-prod24794

Sigma sport have very nicely agreed to replace my corsa g+ because the tread came away from the casing after 1500 or so miles. I wasn't expecting them to, so dead pleased.

I was told by one member of staff who jumped on the email chain with the person who was arranging the return that it was my fault they'd delaminated because I was running them at 55psi on 25mm rims despite the advised '85psi' written on the side of the tyre. I did try to explain that 85psi on 25mm rims with a 25c tyre would be nigh on unrideable, and the rims were only guaranteed to 60psi but he accused me of using 'mismatched components'.

I should be getting a new set in the post though, which is pretty amazing customer service tbf.

I did try to explain that 85psi on 25mm rims with a 25c tyre would be nigh on unrideable.

Why?

They come up narrow, on a 20mm internal wide rim they were 32-ish.

I am also interested in how 25mm tyres at 85psi would be unrideable.

Also calling it a component mismatch sounds fair. There is no pressure you could achieve where manufacturer requirements of both tyre and rim would be satisfied. Free tyres sounds pretty cheeky.

55psi in 25 seems very low. Are you a sparrow? I never used to get much more than 1500 miles out of a Corsa SC on the rear so I think you've done well.

I don't agree - wider rims mean lower pressure surely, manufacturer advice is based on standard width rims afaik.

enjoying the change from my sport contact 35s to marathon supremes 32s. feels like a whole new bike..

anyone want a pair of lightly used continental sport contact 35s?

Perhaps unrideable is an over statement, but on the occasions when I put 85psi in them to seat the tyres/give them a bit of a stretch they were rock solid. I'd not want to ride them on the road, for sure.

I weigh 74kg and at 55-60psi they felt like normal tyres, any higher and they felt like solid rubber. I have Veloflex corsa now at 55psi and they're spot on. I put 60psi in on the rollers and they sit on top of the rollers properly without deforming, something that I've seen happen on normal rims at anything below 90psi, so I don't see why any more than that is needed.

Nope, 74kg. Tyre drop was the same as 90 or so psi on a normal rim. They are absurdly wide rims, but I've used them with gp4000s and Schwalbe one at around the same pressure.

Fwiw, I wasn't expecting free tyres and didn't push for it at all. I was returning them because I wasn't sure if it was a manufacturing fault, I certainly didn't expect a refund/replacement.

No one goes FULL scoble ..

Ha ha. Am I way off here then? Wide rims means more volume means lower psi, no? Rollers is the test for me - too low and they get all squelchy and sticky but 60psi is spot on, even a bit hard. Definitely too much for tarmac. Same with all tyres I've tried on these rims.

The rims are these btw http://www.superstarcomponents.com/en/arc22-ultrawide-wheelset.htm which I think are rebadged Kinlin xr22 (?)
Superstar state a 60psi max, are they just pulling that out their arse? seems a weird thing to say for a road rim if it's not necessary.

Edit: a bit of googling suggests I should be running them higher, so maybe I've just been kidding myself...

Oh right, I just scored a very cheap pair of them in 28c so hopefully they'll be close enough to that

There are no 28c kojaks ..

They've come unused off a C'dale Bad Boy