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Alu Alloy Chainrings?

EugenesDIYDenEugenesDIYDen Posts: 10
edited June 2016 in MTB buying advice
So I need a new 32t middle chainring. Replaced chain (overdue), but it slipped. Replaced freewheel and slipping was much improved but it's still slipping on the middle chainring when I put my "pedal to the metal" on start off. So it seems the trend (or so I've been told) is that middle and largest chainrings are now made of alu alloy. Since my existing steel ring only lasted 1500 to 2000 miles, what hope have I got with an aluminium one? Should I buy a totally new crankset? The one I got the year before last was a Shimano type with all steel rings.

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