Whoops, probably not my best ever buy

[MrGrumpy]

these might help

 

[Arch]

But it's nearer the back wheel? Confused.com

It's the front derailleur, because it's at the front of the drive chain system. The rear derailleur is at the rear of the drive train, and coincidentally, at the rear wheel...

 

[Pat "5mph"]

It's the front derailleur, because it's at the front of the drive chain system. The rear derailleur is at the rear of the drive train, and coincidentally, at the rear wheel...

I was right then: getting better at this cycling lingo

 

[Arch]

I was right then: getting better at this cycling lingo

Once you can spell derailleur without looking it up, you've really arrived!

(well done, I know how hard it can be to acquire jargon!)

 

[furball]

The front changer is definately in the wrong position and one of the teeth on the small chain ring looks worn. Check the shape of all the teeth on the chain ring and the rear casette. They should have a short slightly inclined flat top. If they are pointed they are worn and will cause the chain to jump off.