Very rarely have I noticed any shifting/slipping of my derailleurs. However, on my 2nd to last ride, when I was pedaling hard, especially up a mountain, I noticed my rear derailleur kept shifting/slipping. I was so bad I took my bike in for a tune-up.
On my last ride this morning (commute to work), the rear derailler continued to shift/slip on the flats and as I was climbing a mountain the front derailler started to shift/slip as well. Finally, the chain snapped off - I broke one of the links! So I had a 1+ hour walk home to try to think of what the problem would be.
I took it back to the bike shop and they replaced the chain. They suspect that one or more gears/teeth on my rear cassette might be worn. I'm not sure how that would explain the front derailler slipping this morning. If I have time this evening, I'll take my bike for a test ride to see if the new chain fixed my problem or not.
Any suggestions from you guys what it might be?
- 2005 Cannondale T2000 Touring Bike
- 2,800+ miles on same chain before it snapped
- total bike weight ~ 50lbs
- me < 200 lbs