Rear derailleur body rubs against chain when in highest gear

Question

I have a Vitus bicycle with a Claris groupset. When I put the bike in the highest gear, the chain starts to touch a part of rear derailleur.
I am still understanding how to fix my bike on my own. So don’t know what the specific part called.
I have tried aligning the gears and adjusting the high and low limiting screws, but nothing seems to create enough of a gap between the chain and rear derailleur when in highest gear.

Warren Burton · Answer

Unless this is a new situation with an existing chain, your chain is too long.
To fix this you need a chain breaker tool. You’ll use this many times over your bike riding life so buy a good quality one.
You appear to have a Shimano chain so you’ll need a Shimano compatible quick link to rejoin the chain.
Remove enough links so that the derailleur is barely tensioned in the small/small chain ring & cassette combo. Don’t remove so much that your derailleur is over tensioned in big/big. You can’t realistically add links back in so measure twice cut once.
Watch a video or two on how to use a chain breaker as it’s not 100% obvious for your first time.
Alternatively, your LBS should be able to do this very quickly and cheaply if you don’t want to invest in the tools yet.

Rear derailleur body rubs against chain when in highest gear

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