What do I need?

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The chainrings need replacing on my Sirrus and it seems to me that it will be cheaper to replace the whole crankset. I can get an Alivio for about $50 on ebay but I don't know what to buy.
Will the Alivio T4010 9-Speed 170mm 26/36/48t Octalink Crankset fit?
And what tools will I need? And why did everything just get big?
 

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Sharky

Guru
Location
Kent
More likely to be a square taper?
- remove one of the bolts and check - just need a large allen key for this step
 
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Not sure if you need an 8mm or 10 mm, but try with two keys together. Two 5mm's or a 5mm+3MM.
Won't get quite the same leverage, but it should work.
Put 2 keys in together?
 
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