Rear derailleur i think its done

[SQUIREJIM73]

Hi all, novice at fixing bikes, I can do the essentials but am stuck but refuse to go to local lbs as they cost fortune but mainly are rude. Yet the other shop in a posher part of town are lovely. Anyway, I want to try and diagnose then attempt a fix first. I have had a few offs lately and the most recent one caused bike hangar to snap as it should. I got a new hanger installed it but there is /are still fundamental issues.
I believe my sram force derailleur has had it. The B screw is bent and I cannot either screw it further in nor unscrew it out to get replacement screw. I don't have hacksaw and just worried I will mess things further up. With the existing rear derailleur on the new hanger I cannot align the gears at all. The moment I turn the pedals on my bike stand it wants to change gear. There is resistance and ultimately the derailleur / jockey wheels / guard gets stuck. Ive tried just leaving the chain om one cog but the bike wants to change gear.

If I buy a replacement rear derailleur, like for like so the B screw is straight and will work. Do you think this will allow me to properly index my gears as im thinking perhaps the derailleur itself is bent....

Can I upload pics/vids here to help show what im talking about?

Thanks in advance
Mark
Ps I didn't know bike radar had closed 😳

 

[Sharky]

They seem pricey!
Try put a plea into the "Wanted" section on here. You might be lucky.

 

[SQUIREJIM73]

Lbs will be pricey but rear derailleur think ive round an eBay one for £27. Still expensive to me...!!

 

[SQUIREJIM73]

Can you spot the issue? Obviously the cable not attached nor chain. But does derailleur look bent? Damaged?

 

[Big John]

Your recent off, which broke the hanger, is unlikely to have damaged the frame. Now you've fitted a new hanger providing your RD wasn't damaged everything should work after the gears have been indexed. As that's not the case, and before you go and buy a new RD, it's worth getting your LBS to check the hanger alignment. They can't charge the earth for doing that because it doesn't take long to check it. They'll have an alignment tool which I doubt you have in your tool kit. If they say it's fine then the problem is your RD, if they say the alignment is out the tool they have is able to correct the problem and they will offer that service. When you know the hanger is positioned correctly, and put the RD back on, if it hasn't cured it then the RD is at fault. You can either buy a new one or bend it into shape yourself providing you know what your doing. I'd advise going for a new.

Edit : I've looked at your photos and can't tell if the RD is bent. I'd need to see it from various directions on the work stand.

 

[davidphilips]

Have you tried adjusting the cable? the high and low adjustment screws are just stops for high and low gears? The B adjustment screw sets the top jocky wheel to cassette distance and unless changeing to a duifferent size cassette need not be adjusted.