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enter image description herelooking for a replace of a Sachs Hurret Echo S with a modern derailleur for use on a 14 28 free wheel. Suggestions have been the Shimano Altus or Shimano Tourney neither actually work as lower cage hits the spokes when shifting to the large rear cog.

Bicycle is a Peugeot 80s racer 12 speed -

Any suggestions for a basic replacement that works very welcome -

Thanks Stephen enter image description hereenter image description here

  • Have you straightened the bent derailer hanger? – Daniel R Hicks Jun 13 at 12:33
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Freewheel 6 or 7 speed wheels typically have no clearance problems there. The issue is likely being caused by rear derailleur hanger misalignment and/or the low limit screw being adjusted too far out. There are many questions about both.

Update post-image: The derailleur hanger is bent. Put the shifter in high position and poke a 5mm 3-way wrench or L-wrench into the pivot bolt of the new derailleur. Reef it around to make the plane of the pulley centerlines appear parallel with the plane of the cogs. Re-adjust the high limit if needed, double check it looks parallel, and you should be good. Eyeballing like this isn't great for latte speed generation bikes, but it's fine for 5 and 6 speed. If you want to baby the frame you could have it done with a proper tool, which I'd recommend in most other non-emergency cases.

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  • thanks for the feedback: rear derailleur hanger misalignment and/or the low limit screw being adjusted too far out. Both have been checked and tested with two separate modern derailleurs -. The modern derailleurs tested seem to too big; admittedly the Shimano Tourney is long but the Altus also experiences the same issues - and is quite bulky. Just for reference the Echo S was a modified Echo with the hanger angle adjusted to allow the 28 rear cog. - and clear the spokes - I'm sure there must be a smaller modern derailleur which can compare - ? – Stephen Jun 12 at 19:43
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    I think you should add some pictures. It's really unusual for spoke interference to even be possible on freewheel road bikes. – Nathan Knutson Jun 12 at 20:32
  • I concur - derailleur hanger bent is my guess, and the longer cage mechs show that worse because trigonometry. Its not hitting spokes because of the new derailleur. – Criggie Jun 13 at 0:12
  • Another thought - I bet the old derailleur is bent back the other way, cancelling out a bend in the hanger. A bike this old has had decades of usage on it. – Criggie Jun 13 at 0:13
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    Looking at the picture, I count 5 cogs on that cassette. How does the bike have 12 speeds with 5 cogs? Your main problem is the bent hanger. It's pretty tweaked. You wont know if you need a new der until you correct that poor hanger. Then if it turns out that your der needs replaced, I would be looking for a 5 speed der, because your bike has either a 10 speed or 15 speed drive train. – bradly Jun 13 at 14:41

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