Assuming the cassette isn't actually jamming on the hub body, it should be fine. If the derailleur is catching the spokes you need to adjust the limit screws, which is an easy job and something a bike shop really should know about. I second Danstuff's recommendation.
Assuming the cassette isn't actually jamming on the hub body, it should be fine. If the derailleur is catching the spokes you need to adjust the limit screws, which is an easy job and something a bike shop really should know about. I second Danstuff's recommendation.
http://www.parktool.com/blog/repair-help/rear-derailler-adjustments-derailleur