I'm led to believe that wheel bearings on the entire 75/ZT range are strong and fail very rarely.

On my old ZT 160 I had the front passenger bearing replaced while trying to trace down a problem. The only one that the MG/Rover dealer had ever replaced.

Suffice to say the old bearing once removed showed no signs of wear after nearly 50k of Manx roads and trust me that some feat. The issue was finally tracked down to misaligned rear passenger wheel scrubbing the tyre.