How do these derailleurs work?
#1
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How do these derailleurs work?
This is a Mongoose "snare" 24 speed. I'm using this derailleur I got off my Cannondale Bent 2 bike of same 8 speeds on the sprocket. Should it work? Mind you I had to manually bend the dropout since it bent when I broke the original derailleur. Not sure if I bent it 100% back original position. Anyway, it appears to have maxed out inwards an unable to reach the first gear. None of the those adjustment screws appear to be impeding its travel inwards. I was able to get to the 8th gear at one point but I also have issues with that. I'm wondering if even this derailleur is capable of changing gears across the whole gear assembly. Maybe it wasn't the original for the Cannondale?
#2
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This is a Mongoose "snare" 24 speed. I'm using this derailleur I got off my Cannondale Bent 2 bike of same 8 speeds on the sprocket. Should it work? Mind you I had to manually bend the dropout since it bent when I broke the original derailleur. Not sure if I bent it 100% back original position. Anyway, it appears to have maxed out inwards an unable to reach the first gear. None of the those adjustment screws appear to be impeding its travel inwards. I was able to get to the 8th gear at one point but I also have issues with that. I'm wondering if even this derailleur is capable of changing gears across the whole gear assembly. Maybe it wasn't the original for the Cannondale?
Well it's a "s-ram" derailleur.
Can't get to 1st gear. Derailleur can't be put more inwards towards unless I bend the dropout inwards. Right now it comes down to where derailleur is attached straight. Could/should I bend it inwards to reach first gear?
Last edited by juntjoo; 04-11-22 at 03:45 PM.
#3
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Some SRAM derailleurs are compatible with Shimano and other shifters but many aren’t. I would not recommend bending your dropout if the derailleur currently looks straight. Check out Park Tools website or Sheldonbrown.com for some help with the basics for derailleur adjustment.
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#4
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Does it have an "L" screw that can be backed out for effect?
SRAM
SRAM
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Best way for noobs to let us see pics is to load them to imgur.com or some other hosting site and then type the sharing URL of them in the text of your message. You might have to delete the https:// from it and put a space before and after the . (dot). Some of us will figure out how to make that a valid URL again and will post them for you.
There is also a gallery here, but you still can't put them in your messages till after you get 10 posts. But if you tell us they are there, we can sometimes find them.
Welcome to BF.
There is also a gallery here, but you still can't put them in your messages till after you get 10 posts. But if you tell us they are there, we can sometimes find them.
Welcome to BF.
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#6
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imgur.com/L1s9fxJ
imgur.com/lakngvk
thanks. IDK if there is much useful info in the pics
imgur.com/lakngvk
thanks. IDK if there is much useful info in the pics
#7
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This is a Mongoose "snare" 24 speed. I'm using this derailleur I got off my Cannondale Bent 2 bike of same 8 speeds on the sprocket. Should it work? Mind you I had to manually bend the dropout since it bent when I broke the original derailleur. Not sure if I bent it 100% back original position. Anyway, it appears to have maxed out inwards an unable to reach the first gear. None of the those adjustment screws appear to be impeding its travel inwards. I was able to get to the 8th gear at one point but I also have issues with that. I'm wondering if even this derailleur is capable of changing gears across the whole gear assembly. Maybe it wasn't the original for the Cannondale?
#8
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none of the adjustment screws made a difference. I think maybe simply the range of this particular derailleur is not wide enough.
And I'm okay with that if it's the case, so long as I can get a lower gear from the front shifter. That's in my other thread.
And I'm okay with that if it's the case, so long as I can get a lower gear from the front shifter. That's in my other thread.
#9
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I’ve correct many bent RD hangers and many have needed small corrections, with a professional tool, to fix such problems. “Eyeballing” the alignment only works on BSOs.
Please clarify the problem. People trained on automobiles use “1st gear” when they climb a steep slope from dead stop. On a bike that would be the largest cog on the back - the lowest gear ratio on the bike. Others may consider “1st gear” to be the cog the chain rests on when the rear shift cable is fully relaxed (unless you’ve got a low normal RD, ugh). Post pictures and talk about the cog sizes on your “gear assembly” vs what “gear” the bike is in. Then we can help. Again though, you may need a proper alignment tool and know how to use it.
Please clarify the problem. People trained on automobiles use “1st gear” when they climb a steep slope from dead stop. On a bike that would be the largest cog on the back - the lowest gear ratio on the bike. Others may consider “1st gear” to be the cog the chain rests on when the rear shift cable is fully relaxed (unless you’ve got a low normal RD, ugh). Post pictures and talk about the cog sizes on your “gear assembly” vs what “gear” the bike is in. Then we can help. Again though, you may need a proper alignment tool and know how to use it.
#10
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Pic assist. It may just be the angle, but it appears that either your derailleur hanger or the derailleur itself is significantly tweaked. Notice how the derailleur cage hanging down points left towards the tire? It should be as close to perfectly vertical as possible. With something tweaked this badly, you'll never get the adjustment right, I'm afraid. That SRAM 5.0 derailleur should have plenty of range to shift an 8-speed cassette like that.
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Another pic assist. Despite the potentially bent derailleur hanger, your L limit screw doesn't appear very "backed out". It seems like there's still some room for that screw to back out more, no? Back that screw almost entirely out of the derailleur housing, until the inner body plate no longer contacts it when you manually push the derailleur fully inwards. It may help to loosen the shifter cable completely and start fresh using some of Park Tools' derailleur adjustment videos. They may some excellent how-to videos on this.
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By BSO, do you mean Ben Serotta Offering?
John
#14
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I’ve correct many bent RD hangers and many have needed small corrections, with a professional tool, to fix such problems. “Eyeballing” the alignment only works on BSOs. Please clarify the problem. People trained on automobiles use “1st gear” when they climb a steep slope from dead stop. On a bike that would be the largest cog on the back - the lowest gear ratio on the bike. Others may consider “1st gear” to be the cog the chain rests on when the rear shift cable is fully relaxed (unless you’ve got a low normal RD, ugh). Post pictures and talk about the cog sizes on your “gear assembly” vs what “gear” the bike is in. Then we can help. Again though, you may need a proper alignment tool and know how to use it.
Pic assist. It may just be the angle, but it appears that either your derailleur hanger or the derailleur itself is significantly tweaked. Notice how the derailleur cage hanging down points left towards the tire? It should be as close to perfectly vertical as possible. With something tweaked this badly, you'll never get the adjustment right, I'm afraid. That SRAM 5.0 derailleur should have plenty of range to shift an 8-speed cassette like that.
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I cannot envision how to correct alignment with an adjustable wrench and a Machinist square. I’ve had some success with winding sticks but they’re only for wood workers/furniture makers.
Your photo sure makes it look like your RD hanger is still out of line. I only charge $10 to align a hanger. Further RD adjustment is extra. Talk to your LBS (oh sorry, independent Local Bicycle Shop). I’ve no idea what the corporate fleet bike shops charge.
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Good lord, this mystery was solved the moment the OP indicates SRAM 5.0 and Shimano shifter.
SRAM 5.0 rear derailleur won’t work with a Shimano shifter. You can tweak adjustments til the cows come home and it will still not work even remotely well.
Honestly, you are waisting your time with this component mis-match. Just get a shimano 8 or 9 speed RD.
SRAM 5.0 rear derailleur won’t work with a Shimano shifter. You can tweak adjustments til the cows come home and it will still not work even remotely well.
Honestly, you are waisting your time with this component mis-match. Just get a shimano 8 or 9 speed RD.
Last edited by Kapusta; 04-13-22 at 06:13 AM.
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I'm using Shimano v-brake type shifters which I'm having issues with too. Well, the front shifter. At the moment my rear shifting combo isn't horrible. I have a decent range I've been able to rig it for. I can get 2nd gear at least and matched with the 1st gear up front is perfect really for where I am, flat Florida. So based on all your feedback sounds like I have a Frankenstein of a configuration and prolly won't be able to get it perfect, but as suggested I will watch more vids and learn those adjustment screws. I'll report back as I progress with this.
Something like a Shimano RD-M310 or RD-M360 would work out very well for you here.