Question about Mongoose Cycling

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I bought a Mongoose Sabrosa 3x8 few weeks ago, and even thoungh I like it a lot, I've been having a few issues with the derailleurs and the rear wheel. First time I wast riding it uphill and the rear wheel just came out of place all the way to the left side of the frame, I took it to the shop and the guy supposedly fixed it, but after that I had the chain sliping out and skipping gears all the time, so, I took it back to them and now another guy told me that the two derailleurs were too close and that was the problem. Now the wheel comes out of place more often and even if I try to fix it, It just last for a few kilometers and slips to the front again. I think the screws that hold the rear derailleur and the disc brakes are not strong enough and they are scratching the frame already. Any suggestions? I just got the bike two weeks ago and I have took it three times to the shop, Is that the way it is supposed to be?

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Quick releases skewers will hold the wheel just fine if tightened properly. They're SUPPOSED TO dig into the paint.

http://www.nashbar.com/images/nashbar/web/PDFs/QUICKREL.PDF

Deralleur and brake cables will stretch or break-in with initial use and always require some tweaking early on. Some shops build that expected tune-up into their sales offering.

http://www.parktool.com/blog/repair-help/categories/derailleur-systems

http://www.parktool.com/blog/repair-help/categories/brake-service-and-repair

Posted on May 24, 2011

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http://www.parktool.com/blog/repair-help/rear-derailleur-hanger-alignment

http://www.parktool.com/blog/repair-help/chain-installation-derailleur-bikes

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