gkamieneski

I am in need of replacing the outer cage plate on my Shimano RD-5701s and the Shimano doc says part number

Y5XV98040. The outer cages I see available are part number Y5XH98040 and listed to fit Shimano RD-5700s.

Even though these short cage rear derailleurs look the same, the fact that Shimano has 2 separate part numbers lead me to believe that these 2 outer cages are not interchangeable.

Shot in the dark, but does anyone have any experience with this part?

FBinNY 

Sometimes parts are renumbered simply because of cosmetic differences. Not saying this is so, but if the RD was made in different versions, that may be the case.

KCT1986

For the RD-570?-? series, there are differences in the cage of the models. 1st model was RD-5700. The 2nd version, (5700-A,) uses a different cage that is slightly longer between pulleys, and the placement of the upper pulley relative to the pivot point is different. These slight changes results in added large sprocket capacity & total chain take-up.

3rd version 5701 has the same capacity specs as the 'A' version. So, presumably similar cage specs.

So, swapping a 1st version 5700 outer cage on is possible, it will also require a matching inner cage (shorter pulley to pulley measurement). And the capacities will change.

This info is for the SS versions. Also assumes that the parts are correctly IDed by the seller.

KCT1986

Not In this case, there is much more going on. See post #3.

gkamieneski

I think you may have hit it on the head. Logically, the original 5700 version would be the shortest pulley center to pulley center and then to handle larger cogs the pulleys had to be widened as well as the cage mounting holes.

Since I never use more than a 11-25 10sp cassette, my best course of action may be to replace both inner and outer cage frames with the shorter 5700 version assuming there is no difference between the 5700 and 5701 bodies.

KCT1986

Yes, as stated prior, the 1st version has shortest C to C, and slight difference in upper pulley location.

Installing new cages should work. Shimano doesn't provide info on the bodies. But, many of the other Shimano RDs of this era used the same attachments method (solid pivot axle, secured by the long thin bolt). DA and Ultegra are sometimes different.

The pivot springs are sometimes different, so you need to check the EV tech doc to see if it seems similar. The 5700s' springs all seems to be the same.



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