Ripped Sidewall - Why?

Any reason this should happen to the sidewalls of my tyres?
Brand new tyre, only used for a couple of hundred km on a fairly new rim.
a Spank Tweet 26".
Is it an inflation problem? Not enough/too much pressure? Problem with the rim?
This is the second tyre it has happened to.

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Looks like the tyre may be slipping on the rim. Not too sure I know the answer but I suspect google probably does.
https://www.google.co.uk/search?q=tyre+slipping+on+rim&ie=utf-8&oe=utf-8&client=firefox-b&gfe_rd=cr&dcr=0&ei=c9q3WbrWMY_W8AeggJuIDA

Another picture

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Spank Tweet 26".

Don't Duck Duck Go that with safe search turned off

could your brake pad be rubbing?

What psi were you running?

@Manson7am Disk brakes so no pad rub.
@coventry_eagle Not sure what psi but I generally pump them up fairly hard. I'm a heavy rider.

Not sure what psi but I generally pump them up fairly hard. I'm a heavy rider.

Maybe too high.

is the rim too wide / thin for the tyre ?
is sizing correct

I'll concur on this.

Try it with some Kevlar walled tyres and see if it still happens.

The ones in the pics don't look too well constructed to go Max psi.

Bloody happened again. Don't know if I've bought some dodgy Nobby Nics. Same tyre as last ones. I'm sure I bought them cheapish from some online shop. Don't suppose anyone else has had problems with them?

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Any sharp edge in your rims?
They look like they've been run with poorly-set V's(I can see you have vbrakes).

^ Most odd this. Possibly might not help, but I’ve never bought Schwalbe.

Only for a friends mountainbike with cantis, when they worked.

No v brakes. Just a disk brake. I can't feel any sharp edges that would cause this either.

Are you leaving the bike with very flat tyres for a long period of time and then jacking the pressure up high? Sometimes I have seen similar when old tyres have been left empty with the weight of the bike on the folded sidewall, the rubber perishes and then splits when pumped up.

Yeah, looks to me like tyres run flat or low pressure?

Can concur, cut seems to cover quite a stretch of the sidewall.

Got a barely used Schwalbe Table Top you can have for a fiver collected or can post at cost.

Eine Schwalbe macht noch keinen Sommer.

Looks like what Randonneurs kept doing on me. Think I was over pressuring them.

Thanks for all your comments. I wasn’t sure if maybe the rim just wasn’t compatible with these tyres or something. Wheel itself is true. Maybe even some sort of problem with how the tube was inflating inside.
@coventry_eagle let me know total cost posted and we’ll do a deal. Cheers.

Are the tyres tough to put on the rim...had the same problem with some tubeless tyres when fitting them. Did you have to use tyre levers to put them on?

@dragonflyblu yes. Had to use levers. Almost thought they were the wrong size tyre. I actually snapped the end off a Park lever trying to get it off.