I’ll be there in September too, I also had a few days riding there a couple of years ago and peanutcracknell is right, the tyre doesn’t make a difference on the Madeira ice, it’s a hardpacked slick on top clay like soil.
I’m planning to go for an Assegai DD up front and a DD DHR at the back but I’d be happy with a Magic Mary up front too.
Ideally something with grip, not too draggy and that does clear any mud should it be wet.
I’m also thinking I probably need a DH style casing at the rear but that’s mostly because I tend to look after the front end of the bike but the rear can take a beating, I’ve never met a jump I couldn’t case 😬
I’m not intending to “race” it was I really don’t think I’ll be bothering the podium at all, I just want to finish 🤞