Got this bike gifted and want to use it as a city bike. However whenever I apply too much pressure to the pedals, the chain swaps from the large ring to the middle one, without me shifting. This would be not as bad if the middle ring somehow makes it way worse. Whenever I try to apply any pressure I hear a rattling sound and the pedals push into nothing. I have no clue about bikes but want to learn more. Can you guys help me? The Foto shows the front chain rings, my thoughts were that maybe the Shimano gear is not set up correctly
by Sistum
5 Comments
There should be an adjuster at/near the shifter that needs to be turned out to adjust the derailleur (front shifter)
You need it to be further out so it stays on the chainring.
I would suggest, that chain rings, chain and cassette are worn out and has to be replaced.
If it’s just doing it on the big one then you can try adjusting the limit screw. I always forget which direction but adjust it until the guide moves outward a little more. If it’s trying to do the same on the middle one and jumps to the smallest it’s the tension. Increase the tension at the shifter.
And lube the chain and wipe any excess off and go from there. Might need new chain, crank and cassette. It’s hard to say.
https://preview.redd.it/3cw1wedzv7og1.jpeg?width=1200&format=pjpg&auto=webp&s=1c312a127c1018572d8104dc5290809b713f1c6e
At the very least it needs to be cleaned, lubricated and the [derailleur needs adjusting](https://www.youtube.com/watch?v=ZNG7g83lI-s). New drivetrain parts are likely needed if the chain is skipping on the cogs.
Where to start…
I use this general checklist whenever I’m checking out a bike for purchase.
It also applies to inspecting and maintaining a bike you’ve already own.
It will encourage you to go through and become familiar with the major systems on the bicycle.
I recommend viewing Park Tools videos on bicycle maintenance for details on some of this stuff.
Start here:
1) Tires inflated.
2) Rims are true.
3) Spokes aren’t loose.
4) Brakes adjusted and inspected (cables, pads, braking surfaces)
5) Chain clean, lubed and measured for wear.
6) Shifting adjusted properly.
7) Wheel bearings checked for play and friction.
8) Bottom bracket/crank/pedals checked for play and friction.
9) Headset checked for play/friction/indexing.
10) Is the seat post stuck?
11) Is the stem stuck?
12) Is the frame intact and is it true?
13) Does it fit the intended rider?
Good luck.
If you have any questions, don’t hesitate to follow up.