W-rated tyres are rated up to 168mph. Y-rated tyres are rated up to 186mph.
A tyre with a higher speed rating will give better grip and stopping power but may not last as long and may not perform as well in cold weather/winter conditions.
Along with different compounds Y rated tyres are likely to have stiffer sidewalls. This means the tyre pressure can be a little lower than a W rated tyre despite dimensions being the same.
You are right to be cautious as too much over inflation isn't a good thing
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A tyre with a higher speed rating will give better grip and stopping power but may not last as long and may not perform as well in cold weather/winter conditions.
Along with different compounds Y rated tyres are likely to have stiffer sidewalls. This means the tyre pressure can be a little lower than a W rated tyre despite dimensions being the same.
You are right to be cautious as too much over inflation isn't a good thing
