The temps drop 10 degrees in 30 minutes before I got out and I didn't know until I was already outside and ready to go. I was slightly under dressed for the temps and freezing wind and Mr. wind was showing his will! I replaced the chain for the last ride but it still was hoping off so for this ride I changed the rear cassette and readjusted the rear derailleur.As I started out the gear shifting was fantastic, the bike felt like it was new until I stood up to drive into the wind and it hopped again! This time it didn't fall off the front, so I am not sure if it hoped in the front or rear. I tried several more times through out the ride and every time it did the same thing. Now it seems to hop when my right leg was pushing, not 100% sure but that's what it felt like. I will check to see if there is play on the crank again as I did a quick check before replacing the cassette. I will again replace the cassette to a 28-11 form the 30-12 which seems too big for the little hills that I am riding... I finally felt good on my ride, pains were very manageable all considering.