Finally got an email from Tiretrends
So apparently it's ok to go there to pick up the tires.
Basically told me to call them couple of days before.
You are going think I am picky but when telling a customer to call, it is usually a good idea to give the phone number to call instead of just having the website address in your signature.
But that's probably just my customer service/sales experience speaking.
Giving the opening hours could have a good idea as well...
But again that's just me