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sram x4 rear derailleur not shifting 7

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sram x4 rear derailleur not shifting 7

Old 06-19-16, 05:30 AM
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sram x4 rear derailleur not shifting 7

i planed an 8 speed sram x4 shifter, shifting 7 with a x4 rear derailleur. well it seems the x4 rd will not shift 7. i set the H stop to line up on the small cog. now i set the L stop and find the der doesn't return to station on the small cog, in fact it is one cog off and i find the H screw no longer engages it's stop, daylight shows between the H screw and the stop. The L screw contacts it's stop to prevent over travel on the big cog as should but it also contacts and makes a false stop on the other end. the contact point is right at the pivot pin and there is no material to grind off to get more clearance. at this point the daylight shows between the H stop and screw. is there sram derailleur that will work with a 7 speed?

Last edited by dr1445; 06-19-16 at 06:02 AM.
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Old 06-19-16, 06:22 AM
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You need a 7-speed SRAM shifter that has a number rather than a name. Some folks report getting 8-speed and 7-speed parts to mix and match because the spacing is so close but I've never been able to get those combinations to work to my satisfaction.

Next step, if you haven't already done it is to look up "rear derailleur install" on the Park Tool site. 2 things: 1. make sure that your shifter is in the smallest cog (7) position and 2. be sure to do all of the steps in order.
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Old 06-19-16, 06:40 AM
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A SRAM 7 speed shifter with the same pull ratio should work.

7) Compatibility - rear shifters - Cycle Gremlin

4) Compatibility - rear derailleurs - Cycle Gremlin
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Old 06-19-16, 08:30 AM
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as i stated the problem is the derailleur, i have not even attached the shifter cable. i set up the H limit then i set up the L limit. as soon as i set the L limit the unit does not return to station for the H stop. the L screw hangs on a false stop before the H screw engages it's stop. it's built into the derailleur nothing to do with the shifter, not even a friction shifter will work. so i am looking for a sram 1:1 long cage derailleur for a 7 speed, the x4 is for 8 & 9.
edit; seems i need the x3 rd, just ordered one.

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Old 06-19-16, 08:52 AM
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How did you space the cassette, or is it a freewheel? Is the QR tight when you do this? I'm also wondering if you have some other problem with mounting like the hanger being bent.
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Old 06-19-16, 09:26 AM
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Originally Posted by Darth Lefty View Post
How did you space the cassette, or is it a freewheel? Is the QR tight when you do this? I'm also wondering if you have some other problem with mounting like the hanger being bent.
i have it setup with a shimano exage rear derailleur, a friction shifter and a 7 speed cassette, this works normally. i have a puch with a shimano 8 speed trigger shifter, shifting 7 perfectly, i wanted to try a sram set up on this releigh mixte. my mistake was assuming the x4 rear derailleur would shift 7, wrong! the x3 is made for that purpose.
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Old 06-19-16, 09:57 AM
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I had the exact same problem with a SRAM x4 derailleur. I thought that if I could put a washer between the derailleur hanger and the derailleur, that would space the rd outboard. That would change the settings for the low and high limits to where they wouldn't interfere with each other. I took the derailleur to a local hardware store (Ace) and rummaged through the small parts in the slide out drawers in the nuts and bolts aisle. I found a bronze bearing that was near perfect. The x4 works fine on 7 speeds now. Hopefully you can see the edge of the bearing in the picture.

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Old 06-19-16, 11:11 AM
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Originally Posted by Focus1 View Post
I had the exact same problem with a SRAM x4 derailleur. I thought that if I could put a washer between the derailleur hanger and the derailleur, that would space the rd outboard. That would change the settings for the low and high limits to where they wouldn't interfere with each other. I took the derailleur to a local hardware store (Ace) and rummaged through the small parts in the slide out drawers in the nuts and bolts aisle. I found a bronze bearing that was near perfect. The x4 works fine on 7 speeds now. Hopefully you can see the edge of the bearing in the picture

i was considering adding a spacer but opted not to due to the small amount of thread engagement. the x3 @ $17 is not to bad a hit.
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Old 06-19-16, 11:57 AM
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Are you sure that you have all the pieces? Sram derailleurs (at least some) have a part that fits between the derailleur and the derailleur hanger on the frame. It's supposed to be held in place by a light wire snap ring but they seem to fall off quite easily. I'm thinking this is a fairly common problem because replacement parts are so easy to find on the internet. That would move your derailleur over the required amount. FWIW, the "b' screw acts on that little part too.
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Old 06-19-16, 04:38 PM
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Originally Posted by Retro Grouch View Post
Are you sure that you have all the pieces? Sram derailleurs (at least some) have a part that fits between the derailleur and the derailleur hanger on the frame. It's supposed to be held in place by a light wire snap ring but they seem to fall off quite easily. I'm thinking this is a fairly common problem because replacement parts are so easy to find on the internet. That would move your derailleur over the required amount. FWIW, the "b' screw acts on that little part too.
That's interesting. I just took a look at the spare parts manual and that piece and the snap ring is shown. There is no part number shown for it on the X4 drawing. I installed the rd about a year and a half ago. I don't recall seeing that piece. I've got a brand new X4 still in the box (a spare) that I just checked. It does not have that part.

I have a Giant Sedona DX that also uses this rd. I just checked it, and the part is not there. But then, it's an 8 speed so I'm guessing the low limit would be backed out more.
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Old 06-19-16, 06:45 PM
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I just went downstairs to check the only two Sram equipped bikes (trikes) in our fleet. They both have the parts you are missing. They would definitely spacer your derailleur outward about 2 1/2 mm. It sounds to me like that would solve your problem.
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