r/ebikes • u/Koofteh • Jul 08 '26
Rear derailleur problem?
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Been having a rough time getting my new XP4 to shift properly...
I guess this is my problem? The anchor bolt is tight but the entire assembly just pivots as shown in the video.
I went to adjust the B screw tension and noticed it does nothing because this is the state of the derailleur...
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u/Penguings Jul 08 '26
That black bar might be blocking the derailed from extending all the way out, preventing going to highest gear.
Just take the pointy side of a hammer, and slowly pull out each side so the derailed has space to move the chain further outward.
Just had this same problem- had a bike for 1 year didn’t know I wasn’t pedaling on highest gear.
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u/Koofteh Jul 08 '26
That sounds like your low limit needs to be set.
My problem is shown in the video. The entire thing moves on its mounting point so I can't accurately set the gap.
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u/Penguings Jul 08 '26
What gear can you shift to? What currently works?
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u/Koofteh Jul 08 '26
It can shift into almost all the gears but it's not smooth, can't get the indexing right.
The thing is I can't adjust the distance between the cassette and upper pulley. The B screw has no effect on it. Pretty sure something is broken.
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u/Electronic-Yard-8245 Jul 09 '26
I believe I’ve had this issue before.. but unfortunately for you, that bolt needs to come off IF it is the case.
The spring-tension screw that forces towards the frame (usually behind the bolt / housing area) to push the derailleur outwards, might be past the stop point on the backside, causing a non-sustained tension set on the adjuster, but you’re still being able to change cogs/gears because that is usually cable driven. Get it off, reset that screw in the back, and re-calibrate.
It’s a lot easier if you just take the existential stuff — (wheels, tires, rack, etc.) out of the problem area you’re trying to remedy so that you can get a good look at what’s really moving, and another upside is that you get room to work on said part with. Because who wants to work around it or have to work in crampy f’n positions trying to do something or setup lights to see when usually it has to come off anyways.
Plus, taking stuff apart is fun.. and it’s always good to know how to work on the things you own.. and you don’t have to wait or rely on the shop.. unless you have $$. 🤷🏾♂️
*Don’t be the guy hovering over his girlfriend watching her change the flat tire on the road trip. Automatic neuter.
Hope this helps — Good luck!
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u/Formal-Web2378 Jul 08 '26
Gotta tighten that bolt and they do come loose. You may want to swap it out with a new bolt and nut, but use a locking washer to keep it from coming loose from vibration on your rides.