A reliable bike shop, do it yourself guides and another reliable shop later and the chain keeps falling off... What I noticed is, it will hover around the big ring for a while and not catch on. The chain is new, less than 150 miles, the crankset is old, probably between 3000-4000 miles(bought it used). Will a old crankset cause a chain to keep falling off. How long do cranksets typically last before going dull?
FYI ...
If your chain keeps falling off, then
more-than-likely the front derailleur is NOT adjusted properly UNLESS you are talking about the chain coming off a Granny when the chain is also on your bike's largest Cogs OR you are a CX racer who is mounting-and-dismounting several times over a comparatively rough terrain vs. not-too-rough pavement ...
In the former instance, the best solution is to simply add a chain keeper/minder ...
In the latter instance, the preferred solution is to go to a single Chainring.
While Wrenches like
oldbobcat have the patience to properly tune a Shimano-or-SRAM front derailleur to its respective shifter, apparently most Wrenches do not ...
For the rest of us who are riding on pavement with a comparatively mundane Double, short of making a pilgrimage to Boulder (Colorado) and have
oldbobcat adjust your front derailleur's stops ...
Then, despite the expected protestations of others who love THEIR bikes & their choice of the
me-too-because-look-at-all-the-Tour-winners-who-use-them components, trust me when I say that the EASY solution is to simply switch to a set of Campagnolo shifters ...
If you can change an incandescent light bulb, then you can set up a pair of Campagnolo shifters + almost ANY (there may be exceptions) derailleur ...
Not only are Campagnolo shifters exceptionally easy to set up, they have the added benefit of working better under (subjectively) adverse conditions.