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I have recently bought a rear derailleur identical to the one that I had previously. after fitting it, I noticed that instead of changing into gear 1 as normal, it pushes into the gear one cog as it has not stretched down far enough and so i can not get into that gear. Is there something wrong or is there a simple fix that I should know about? cheers
don't quite understand what you mean but it sounds like adjustment.
Check the park tools site or sheldon brown for how to set up a mech
http://www.parktool.com/blog/repair-help
Sounds like you need to get the cable tension right. There are tons of tutorial videos on youtube. [url= http://www.youtube.com/results?search_query=how+to+adjust+a+rear+derailleur+mtb&aq=f ]videos[/url]
basically the derailleur moves sideways into (and hits) the largest rear cog on the cassette, making it impossibe to change into gear 1.
Take the mech off, there's a stopper on the mech bolt that twists around, this should rest on the mech hanger to stop it twisting around too far. Simples 🙂
What derailleur is it ?
b tension I think its called - again check the links above