So i was in a pretty big downhill, when i was nearly at top speed the chain simply fell out, it didn't snap or anything, it just somehow fell out. I placed it back and after that all felt normal. Is it too loose or something? I just changed my ratio from 46×15 to 48×15 two days ago
by luigi-u_u
3 Comments
Did you change your chain along with the chainring? The chain may be worn/stretched. It won’t mesh well with the chainring and can skip out at high speed.
I’d check for chain stretch
Chain tension looks good most of the way around, but there does appear to be a “loose” spot when the drive-side crank is at about 80 degrees clockwise from the top (aka 5:00).
You mentioned you just changed ratios. The new ring/crankset may need to be “[centered](https://www.sheldonbrown.com/no-derailers.html#centering)” for uniform tension.
You’ve also got a lot of noise. The rear wheel might not be quite square in the dropouts, or your chain line isn’t straight enough, or both. One of those things, combined with a loose spot in the chain, is likely what caused the chain to drop.
Sounds like your rear wheel isn’t sitting square in the dropout. I know that noise well from my rear wheel never being square haha.