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I'm looking to replace my chainrings on my circa 2000 Trek 8500. It has old Bontrager Comp cranks with 42/32/24 rings. My question - will I need to pull the crank off to change these ?
 

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Yes



Thats the short answer. The granny ring is way smaller than the 4 arms for middle/large rings, plus its often hard to get the middle ring threaded past these and over the front.
 
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