bikaso

Hi,
i would like to change the front and rear derailleur, and wondering what should be compatible for Shimano TourneyTX ?

maddog34

gonna need more info. Bike make and model, gear count and teeth count, front and rear, diameter (in metric) of the tube the Derailleur is mounted on, what shifters are being used, decent pictures of the bike, and your budget constraints, if possible..

Iride01 

Also might be good to know why you wish to change them. While they are somewhat low end Shimano DR's, you won't necessarily improve anything by moving to a higher tier DR.

If they aren't shifting correctly, then that's just likely adjustment or something up with the cables unless the DR's have physical damage to them.

pdlamb

Acera and Sora are the next couple steps up the Shimano product chain, so one of those should work.

But why do you need to replace derailers? Without any more information, I'll make a WAG that one or both need adjustment more than replacement. And, unfortunately, adjusting a derailer is generally more difficult than bolting a new one on.

bikaso

its used bike,and the front derailleur has moved from his place during the transport(my fault).
and because its an old bike and and derailleur seem for me well used i thought that's good to change them(just a personal tought from a newbie ) and i am very open to any advice

maddog34

cool.. thanks for the Pics! I'd say a nice set of Alivio Derailleurs would be great, Or you could step up another notch to Deore for a few more dollars. Most Absolute 3.0 came with Acera level ders, just a heads up... Replacing the Control cables will be wise at this point too.. re-using old shift cables is a literal Pain... the frayed ends love to pierce finger skin.

Personally, i'd go with the Alivios.... they look great and are a bit less spendy..

in case it comes up.. the shifters are "MTB"... Front derailleurs have a different pull Ration between Road and MTB types.. so be aware. Alivio and Deore are MTB ratio.. as are Altus and Acera.

and yes.. New Alivio, and Deore "9 speed", derailleurs work fine with 7 or 8 speed setups... it's the Shifters that work differently, not the Derailleurs.

That Freewheel (rear gears) looks new... a bonus. is the chain also recently new? when swapping rear derailleurs, a longer, or possibly shortening the chain will be needed. Ask for help and watch a few youtubes on chain setup,if you've not done them much..... i use the "Small/Small" method, and always have. I buy chains in bulk... sold probably 75 or so last year.

now.. grab a rag and some penetrating oil, and Start Cleaning that Fuji ! A clean bike is a lot funner to work on
Tip: Pressure Washers Push Water INTO BEARINGS.

bikaso

you right the chain is new, the last owner replaced it last summer.
because i am new just want to clarify a point: do you think that i need to shorten the chain? can you please clarify why that ?
also do you think that the rear derailleur is good ?

maddog34

You will have to get someone to help with the chain setup... you may not have to change the chain length, but you WILL have to disconnect the chain on the bike now. It may or may not have a "Master link" in it.

here's an article on chain setup... https://cyclingmagazine.ca/sections/...ain-correctly/

here is a video on large/large chain setup...
once again,,, since you are new to bicycle repair, i advise that you go to a Bicycle shop and have a mechanic do it... if he will let you watch, you can learn how chain sizing is done.

The Small/Small method, with the chain already routed through the derailleurs, gives the best results for me, but is not easy for a beginner... i have nearly 60 years experience in bicycle, ATV, and motorcycle repairs.

As to the rear derailleur.. it is a low quality one, but they do work ok until they wear out. The front derailleur, unless it is Bent or damaged, will also do the job once aligned properly. The Alivio Derailleurs are better quality and will be more durable... Deore Derailleurs are another step better quality above the Alivios.!
Rear Derailleur rollers (also known as: Jockey Wheels, or Pulleys) have some looseness to them even brand new... as they wear, that movement, side to side, increases... a Bicycle mechanic will know the difference between ok and worn out.

bikaso

thank you for your valuable advices.
last thing please, do you think that tool is the right one to open screws of the front derailleur to put it back : park tool

veganbikes

I probably wouldn't put much money towards that bike. Usually the bigger the number for Fuji the lower end the bike with the first number being the frame and the second number being parts designation but they did some 3.0s which were at the bottom of the bottom generally. Anytime you see Tourney on a bike, either don't buy it or if you own it don't put much money towards it. Save that money for a better bike that suits your needs. Tourney is at the absolute bottom of Shimano's range though they do a spectrum in the Tourney stuff but at the end you really aren't getting marked improvements to the point you have quality from that line just slightly more modernized looks but the same not so good performance. Get the bike running safely with minimal money put towards it and save the money for something better. If it were a rare or high end frame that someone had inadvertently stuck some cheap parts on, yeah put a little towards it but these were a dime a dozen and nothing special plenty of other hybrids out there.

In terms of adjusting a derailleur you will need a standard JIS/CrossTip Screwdriver, this being my top choice but Vessel also makes some decent ones. Then for putting it on you just need a set of hex wrenches (Metric for most bikes from the 80s on), PB Swiss, Wera, Wiha, Silca are all excellent options but Bondhus makes decent stuff if you are looking to save a little but basic tools like hex wrenches are not a place to save money. Any tool you are using with some regularity and especially one that you would use all the time you want the best quality you can get so you aren't stripping out bolts and causing issues. Yes a lot of Ikea furniture comes with hex wrenches but it is a disposable item for cheap furniture not something you want to use on a bike or anything else but that. Only a rich person has time and money for cheap tools and if you don't want to invest in tools then support your local shop who can do whatever work you need (generally) you are paying not only for their tools, but their time, their knowledge/expertise and also to not have to do it yourself which takes time and time is money.

Bill Kapaun

I bought a set of these. Small enough to carry in your tool kit.
https://www.napaonline.com/en/p/CHTH...ressionRank=15

I also have a set of 3/8" drive metric sockets similar to these, but a better quality level and a bit wider range.
https://www.harborfreight.com/38-in-...gaAnzbEALw_wcB
EDIT- The 3 way tool you listed is a handy "also have" tool, but sometimes won't work in certain spots. Sometimes it's great.
It just kind of depends what part of the bike you are working on and personal pref.

maddog34

yes, it will work on the front der. clamp.

align the derailleur chain cage to the sprockets.. the bottom of that cage should be about two mm above the big sprocket where it passes over the top of the big sprocket.

Iride01 

With the stem angled upwards so awkwardly, I suspect the bike really isn't the correct size or maybe just not the correct model and geometry frame for you. Stems should be almost horizontal or parallel to the ground. The more you deviate from that the more we know you are attempting to make a poor fitting bike or the wrong type of bike for your desired position on the bike fit you.

So when buying stuff to put on it, consider that you might be better saving that money for a different bike.

While the pics of the front DR look horrible, you can clean it up and reposition the clamp so it's positioned properly and the cage is in line with the chain and rings. Possibly the clamp adapter/shim for the smaller seat tube needs to be changed.