Sprocket cassette stuck?
The bike shop where I bought my bike (which thankfully no longer exists) tightened the mountain bike sprocket set so tightly that it wouldn't come off. Two people had to stand on the tool, but nothing worked.
Are there any tricks?
I haven't found anything suitable to extend the lever yet.
It's a screw ring, I assume, because they're usually very tight.
The pros clamp the socket in a sturdy vice, place the wheel on it, and use it as a lever. It's always a good idea to have the tire fully inflated while still on the socket.
I got myself a German army key for tanks. Mine is even longer, but I also like to ask someone to hold the wheel when I want to get the rim off. If necessary, I'll even hit the key with a heavy sledgehammer.
WD-40 is also helpful, which you spray onto the screw ring from the front and back.
I can also extend the lever with a large box wrench. I have a huge one that the scaffolding fitters forgot.
No, it's a compact cassette. Hitting it won't help. I've put some WD-40 in it now and will let it work. Otherwise, I'll get a water pipe or something like that to use as a lever.
So you're using the chain whip?! Then you only have to spray the lid.
Yes, that's what I thought too. You don't need to tighten this lid that much. But I've had problems with this closure before, and I've even broken nuts in the process.
Well, I really can't do without it. 🙂
But when I consider that it's supposed to be tightened to 40 Nm… I guess they just slammed it down all the way during installation. It's only been on for less than two years, so it's not corroded solid.
Impact wrench.
The easiest way is to get a suitable socket wrench with a 1/4" drive and take it to your nearest tire shop or auto repair shop. (I'm assuming there's no "normal" nut or bolt on it; you need a special tool.)
That's the way it is. And you can only counteract it to a certain extent with the chain whip.