Join Date: Apr 2007
Location: Syracuse, NY
Bikes: 2008 Novara Randonee - love it. Would have more bikes if I had time to ride them all. Previous bikes: 1968 Motobecane Mirage, 1972 Moto Grand Jubilee (my fav), Jackson Rake 16, 1983 C'dale ST500.
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The first thing to learn about maintenance is to look at things and how they work together. When you move the chain backward you are rotating the chain and the bottom bracket. By simply disengaging the chain you can see if you still feel grittiness or resistance - therefore whether the BB is involved. The chain is in turn moving the rear cassette. By removing the rear wheel and rotating the cassette you can see if you feel grittiness in the freehub.
Although it's great you want to do more maintenance, at 500 miles I would take it back to the shop for evaluation. They may also be quite willing to help you with a few basic maintenance hints beyond what you already know.
There's no such thing as a routine repair.
Don't tell me what "should" be - either it is, it isn't, or do something about it.
If you think I'm being blunt take it as a compliment - if I thought you were too weak to handle the truth or a strong opinion I would not bother.
Please take the time to post clearly so we can answer quickly. All lowercase and multiple typos makes for a hard read. Thanks!