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Chain popping off crankset. Advice?
Regardless of components and adjustment (new/used... chain/deraileur/chainrings... serviced, properly adjusted limits/tension/height...)
ANNOYING (No need to get off. I just shift down to catch chain then shifting into high = to put chain back on low chainring, shift down to low > back to high)
Chain pops off chainrings upon starting to pedal. upon my normal startup about 25% of time chain pops off. (Only solution I've found is to start in a crazy-low gear. Normal start is high-7th in 2x10 drivetrain. Easy 15+ mph in 3 car lengths. Easy 25+ mph average on flat, same speed as cars just faster startup @ lights) 9000+ miles yearly
Replace:
Chainrings @ 9-12 month, when visibly worn on side from shifting. Still good useable NOT "SHARK TOOTH" bike co-op accepts and uses on their bikes without a problem.
Chains @ 3 months approx 2000+ miles, 0.7 wear.
Cassette @ 8 months approx 6000+ miles
disc brake (pads @ 2 months. Rotors yearly)
Brake pads = 180mm rotors F/R with resin pads. (Pads would last way longer with 160mm but I prefer stopping power and feeling safer at FASTER speeds)
Shimano XT index shifting F/R.
IF ANY ALIGNMENT ISSUES = too small for eye to see (10+ years experience, local bike shop, bike co-op)
NEVER use "used parts" only new on my bikes (my used, discarded parts are in average condition, still better than entry-level parts) (bike co-op, gladly accepts, resells higher quality "$$$” for parts too good for their bikes and uses other parts.) (Everytime I buy a new bike I do a complete overhaul, donating new "complete bike, less frame set")
00
Bike shop = I'm riding too hard
2 Answers
- ?Lv 61 month ago
I think you should lay off the amphetamines. If you're dropping the chain all the time and can't figure it out, you'll have to show it someone who CAN figure it out, aren't you? Go to a bike shop. No one on the internet can do it for you.
- ?Lv 71 month ago
Since I can't physically see the bike...everything here is pure speculation or a guesstimate.
1) Improperly installed chainring. Does it wobble from side-to-side, even a little?
2) Derailleur improperly adjusted. Pushes the chain too far out. You are using the half-shift or trim feature found on Shimano STI shifters, I hope.
3) I would NEVER trust used parts. A chainring - cassette - anything!
4) I've had chains & cassettes changed when needed. But I have never had to change a chainring or crankset. One bike (my 2011 Raleigh Sojourn touring bike) has over 13,000 miles on it with the factory crankset & bottom bracket.
You wear out disc brake pads in 2 months! 😲 Holy Sh*t!