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croft
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.