Shifting issues!

turbote
turbote Posts: 24
edited April 2014 in Workshop
Hi all. I'm the new owner of a Canyon Roadlite running full 105 apart from the cassette, which is a Shimano SLX CS-HG81 10 speed off a MTB. In the biggest sprocket at the back, when I shift down the derailleur moves and the chain somehow stays in the same sprocket without much jumping or anything. When I then shift down after that then the chain does all the right stuff, doesn't jump or anything. After that when I'm shifting up then it shifts into the biggest sprocket then I can shift again and it stays on that sprocket. Any ideas of what the problem may be? I'm thinking about nipping down to the LBS otherwise.
Many thanks,
turbote

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