To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
After the first 500km there are small cracks appearing down the centre of the tyre where it runs against the barrel of the trainer. I have done a 250km since noticing the cracks and they don't appear to be getting worse or the tyre degrading.
Pretty easy to fix to the rim if you have changed tyres and tubes before.