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slipping chain

brian91brian91 Posts: 7
edited October 2010 in MTB beginners
I bought a bike second hand about 2 weeks ago and it rode fine but yesterday the chain snapped so i today I bought a new chain and fitted it and straight away the chain slipped when i rode it i had a look and it only slips in the middle and big ring at the front but is fine on the small ring. it also doesn't change into the middle ring very well when i had it. I looked at the rings and they both look quite worn is this the problem or have i fitted the chain wrong?




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