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How to put a 1970's Simplex Derailleur back on

I have a Peugot bicycle from the early 70's and the rear Simplex derailleur is not connected. How do I get it back on. I know that there is a threaded nut with a screw that that fits inside the fork but don't know exactly how to put it on.


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Posted on Jan 02, 2017

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SOURCE: rear derailleur will not stay in new gear. keeps

What kind of gear switcher do you have?
It sounds like the problem might be there...
That should be the part that keeps your chain in the proper gear..
Does the Switch stay in place or does it go back?
if it does....
Is the cable properly tightened to the raer derailleur?
If so is the cable crimped to loose so that there is to much **** in the cable?

Posted on Jul 11, 2009

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SOURCE: I have td one derailleurs front and back on my

Check out his site. It has everything you need to understand these adjustments. The 'regions' are parts of the bike.

Posted on May 02, 2010

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SOURCE: Campagnolo Record 10 sp. short cage rear drlr.+ 13-26 cassette

You don't say if this happens in the BIG ring, small ring or both. If it's just the big ring I'd suspect there isn't enough chain length.

Cross chaining is unnecessary and bad for your drivetrain. I never go more than one cog past the center of my cassette opposite the chainring I use.

Posted on May 02, 2010

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SOURCE: Can you replace Shimano Tiagra clamp-on front

Hi, if it has the same amount of gears usually 3 then you will have no problem at all swapping them over, now as long as the frame thickness is the same or the new derailleur can take up the slack on lock onto the frame securely then you will have no problems what so ever.

The only thing you need to make sure you get right is the allignment and the cable tension correct so it changes the gears as it should do, it may take some adjusting but its not to difficult to do, as long as you run the cable correctly and you have the cable pulled through enough then the gears should change just fine.

once its fitted you can then adjust the cable after to ensure it is changing gears properly, the only problem you may have is if the cable is stretched or damaged as this can cause the gear change to be slow so if you are unsure of the cable then replace with new as its costs next to nothing for a new cable, but apart from that you should be able to do it no problems as its an easy job to do, just make sure the cable runs where it should do if you do change the cable as long as you do that you should have it done in couple of hours.

let me know if you have any problems ok

Posted on Jul 07, 2010

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When i shift to 2nd gear and let off it shifts back on its own

Put the rear derailleur into second gear and stop the bike before it shifts back down. Look carefully at the derailleur and you will see two small screws next to each other. These are stop screws. The stop screw for high gear may be out of adjustment, or the front derailleur is out of alignment putting sideways torsion on the chain forcing the chain to drop back into first gear.

May 04, 2014 | Mongoose Maneuver Mountain Bike

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Since you didn't specify which derailleur needed adjusting, I have included links to adjusting both the front and rear derailleurs.
Park Tool Co ParkTool Blog Front Derailleur Adjustments
Park Tool Co ParkTool Blog Rear Derailler Adjustments derailleur

Apr 13, 2014 | Cycling

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My shimano ultegra left shifter is super stiff/hard to push in; what is going on?

Try flushing out the shifter(s) with WD-40, use plenty. The next step will be replacing the shift cables and cable housings.
  • Take the bicycle in an area free of cars and obstacles, such as an open parking lot. Concentration is required when learning to use Ultegra shifters or any other type of bicycle shifter.
  • 2 Mount the bicycle and rest both hands on the proper Ultegra hand control. The left-hand control operates the front derailleur. The right-hand control operates the rear derailleur.
  • 3 Start pedaling, smoothly and evenly. While pedaling is crucial to propelling the bicycle forward, it is also necessary when shifting the derailleur. Pedaling forces the chain to rotate. The chain must rotate before it can transfer to another gear.
  • 4 Push the outside right Shimano Ultegra lever in toward the bicycle. The rear derailleur will shift the chain to a smaller rear gear.
  • 5 Push the inside right Shimano Ultegra lever in toward the bicycle. The rear derailleur will shift the chain to a larger rear gear.
Rear Ultegra Derailleur Control
  • 1 Push the outside left Shimano Ultegra lever in toward the bicycle. The front derailleur will shift the chain to larger front gear.
  • 2 Push the inside left Shimano Ultegra lever in toward the bicycle. The front derailleur will shift the chain to a smaller front gear.
  • 3 Use the front and rear Ultregra hand controls interchangeably. For small changes in gearing, using the rear control. For larger changes, choose the front control. A smaller gear causes the bicycle to travel a shorter distance per pedal stroke but also requires less energy to use. A larger gear requires greater effort but in turn causes the bicycle to travel farther per pedal stroke.

Oct 25, 2011 | Cycling

1 Answer

Have a multi-speed huffy female bike need to know how to put rear gear derailleur back together

You didn't actually take the rear derailleur apart did you? I'm thinkng not. Search engine "how to install rear wheel" or "... derailleur" for videos.

Jul 11, 2011 | Cycling

1 Answer

I am trying to fix a Huffy Blackwater bicycle (15 speed). The rear derailleur is missing. Can I use a 6 speed derailleur from a Next bike? Can I disable the indexing of the Huffy (Falcon) shifter? Thanks

You can use the 6 speed rear derailleur with no problems. The 5-spd shifter does not need to be disabled, as it will work just fine.

The shifter controls the rear derailleur, telling it how far to move. The rear derailluer just follows what is dictated, so there is no real difference mechanically between the 5spd and 6spd derailleurs, only in the shifter.

If you wanted to make the bike 6spd, you would have to change the shifter and gears along with the derailleur.

Dec 21, 2010 | Huffy Blackwater Men's 26-Inch Mountain...

1 Answer

Need pulleys for my TD One derailleur

There are no pulleys on the front derailleur. Only the Rear derailleur has pulleys.

The Front derailleur consists of two plates that work the front gears (chainrings)

The Rear derailleur consists of a long arm with 2 pulleys to wrap the chain while shifting the rear gears (cassette).

Pulleys range from $10- a pair to $75-. Your local bike shop should have a suitable replacement set of pulleys, depending on the model of your derailleur it is sometimes less expensive to just replace the whole unit.

Dec 09, 2010 | Mountain Td-one Bicycle Front Derailleur...

1 Answer

Broken cable. Need new one, And manual instruction to put it back on.

There are 2 main types of cables on your bicycle, Derailleur and Brake, and two of each of those.

The derailleur cable controls either the front or rear derailleur (gear changer),

The brake cable controls either the front or rear brake.

There are many different types of bicycles and controlling mechanisms. Manuals are available from the individual component companies (ex. A shimano derailleur manual, can be found at but you need to know the model of that companies derailleur to get the correct manual. One other hindrance may be whether you have the correct tools, most derailleurs cables can install with basic tools such as allen wrenches and screwdrivers but brakes can require specialty tools.

I would recommend or suggest that you take the bike into your local bike shop and have them replace the cable quickly and properly. Since that is where you will have to buy the cable anyway, Many times these same bike shops have extra manuals laying around from new bike builds that will instruct you the basics of the components you are working on, just ask, They are free cause they throw them away anyway.

Dec 07, 2010 | Cycling

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