Funny you should mention that. As long as the belts are not over tightened and all the correct fixings are in place and working when you adjust the belts it's great, no ware over time as such.
However, I have broken one before when I first got my 940 somone had broken the alternator tensioning bolt, this meant using a bar to get the belt tight and I did break the bracket right in the middle trying to do this one day.
Since then I've replaced the bracket and made my own adjustment bolt and it's been fine. I think being only cast aluminium it can only take so much abuse.
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