[1Blackwolf1]

  Wonder since it sheared two teeth off the rear sprocket if it may have damaged the front sprocket also.  Just thinking out loud..hope I'm wrong.

[sqf]

Thanks for the info on the o-ring.  So much for adding modern technology!  I guess I'll buy another can of chain wax.....
I checked the front sprocket and it doesn't appear to be chipped, warped or warn in any way.   I think the rear sprocket took the brunt of the slap and that is why it snapped those two teeth.  The chain itself doesn't look like it sustained damage but I want to replace it just in case, plus having the new chain with the new rear sprocket can't hurt.  I considered replacing the front sprocket as well but It looks fine and I don't want to have to pull the cases if there isn't a need. 

[single]

I am really coming to the conviction that one needs to do ones' own wrenching.It is your life on the line with a bike.I have not had a bad experience myself,but others sure have and it makes you think about,no?I really don't fear the roadside fumble with something simple,but when I split lanes between 2 semis........Friend of mine had one of his wheels pass him on the e-way after leaving a tire shop.Others were all loose.