Here's a video of the problem. It's a fairly new bike (5 month old) and serviced about 4 months ago. Just started out of the blue. It did need cleaning/lube but chain is not too long (I measured with tool). I'm not familiar with Brompton derraileurs and only minimally familiar with others 😂 seems like something with the chain tension but I couldn't figure out how to move it. Any thoughts /videos /names of things I need to learn about? Thanks!
Chain skipping / refusing to go to biggest gear cog
byu/Sharpchick inBrompton
by Sharpchick
3 Comments
go YouTube and find the video for derailleur adjustment. if you’re not able to follow the video instructions, bring it to nearest dealer for drivetrain reset
Your derailleur needs adjusting from the looks of things as the chain seems to be wanting to step down a cog as it’s not aligned. This may help:
https://youtu.be/IrBFNRz15ck?feature=shared
You ideally want feeler guages to set the gap.