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Replacing broken SUNTOUR(u) rear derailleur

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Replacing broken SUNTOUR(u) rear derailleur

Old 08-13-14, 03:59 PM
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Replacing broken SUNTOUR(u) rear derailleur

hello everyone
i have bad news , i just finished repairing my bike yesterday and when i tried it in a short trip ( 4 miles ) i feel great , all gears was working smoothly (excluding the biggest one ) and i was so happy , the problem was only with the biggest cog , it makes the derailleur hit the spokes so i decided not to use it until i fix the problem ,today i went to buy soda one hour ago and i forgot the cog problem & use it , so i hear big noise from the rear wheel ( the derailleur hit the wheel spokes ) i stopped the bike suddenly and found the derailleur broken between the wheel spokes :s , the bike is old but i like it so im trying to find a new derailleur which fits my sunntour 5 speeds freewheel ,
here is all pics , hope any one can give some tips

can i replace the rear derailleur with a new one (like shimano) without changing the front one ?
i don't know if any spoke affected or not , but if that happened what is the size of this spokes ? and the spokes wrench size ?
if i want to buy a new rear wheel , which one fits ?
finally , can i change this old suntour freewheel with another brand ?

to be honest , i can't pay more for this bike , so if any one can help me with cheap components i will be so glad

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Last edited by BIKER2000; 08-13-14 at 04:11 PM.
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Old 08-13-14, 04:06 PM
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Originally Posted by BIKER2000
. . . to be honest , i can't pay more for this bike , so if any one can help me with cheap components i will be so glad
Sorry man, I'm broke.

At least you were lucky.
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Old 08-13-14, 04:08 PM
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Your bike doesn't have index shifting, so you're free to use ANY derailleur that fits. The one thing to note is that you're is a so-called "claw" mount derailleur which bolts to the dropout under the axle nut, not to a derailleur hanger which is part of the frame.

So search "claw mount derailleur" and scroll through the choices for one within your budget. Or visit a bike co-op for something used.

BTW- the horse is gone, but here's where you went wrong. The single most important adjustment on any derailleur i the inner or low gear limit. This is the small set screw (usually marked with an L) which sets the stop (limit) position for inboard travel. You need to test that the derailleur cannot shift beyond what's needed to shift to low and into the wheel, or even dump the chain over the top.

This test can't be done effectively by shifting normally. You have to push the lower body in while pedaling (slowly) and make sure that it's IMPOSSIBLE for the unit to travel beyond where you want it to stop.
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Last edited by FBinNY; 08-13-14 at 04:13 PM.
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Old 08-13-14, 04:17 PM
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Originally Posted by FBinNY
Your bike doesn't have index shifting, so you're free to use ANY derailleur that fits. The one thing to note is that you're is a so-called "claw" mount derailleur which bolts to the dropout under the axle nut, not to a derailleur hanger which is part of the frame.

So search "claw mount derailleur" and scroll through the choices for one within your budget. Or visit a bike co-op for something used.

BTW- the horse is gone, but here's where you went wrong. The single most important adjustment on any derailleur i the inner or low gear limit. This is the small set screw (usually marked with an L) which sets the stop (limit) position for inboard travel. You need to test that the derailleur cannot shift beyond what's needed to shift to low and into the wheel, or even dump the chain over the top.

This test can't be done effectively by shifting normally. You have to push the lower body in while pedaling (slowly) and make sure that it's IMPOSSIBLE for the unit to travel beyond where you want it to stop.
thanks bro for tips ,
i found this shimano ( Shimano RD-TX35 Tourney Rear Derailleur 6/7 Speed with Hanger ) its 6/7 speed , is this ok ?
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Old 08-13-14, 04:23 PM
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Originally Posted by BIKER2000
thanks bro for tips ,
i found this shimano ( Shimano RD-TX35 Tourney Rear Derailleur 6/7 Speed with Hanger ) its 6/7 speed , is this ok ?
If you have $11.00 + shipping is's better than OK. It's near perfect for you. The only thing better is a similar unit for $9.

BTW- install carefully, and pay attention to details, you already know the consequences of riding something only halfway adjusted.

Also, take a moment to run the chain through your fingers, and make sure the event didn't twit or jam any of the links. If in doubt, order a basic 6-7s chain (same as 5s) in the same order so you don't lose time or need to pay a separate shipping cost.

BTW- I noticed in the link, that they referenced shipping to Harrison. If that's what you entered, then we're near neighbors. You should add Harrison, NY or Westchester Cty, NY or similar to your profile, because it can often lead to getting location specific help, such as (possibly) an offer of a free or cheap RD if you'll go pick it up.
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Last edited by FBinNY; 08-13-14 at 04:30 PM.
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Old 08-13-14, 04:33 PM
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Originally Posted by FBinNY
If you have $11.00 + shipping is's better than OK. It's near perfect for you. The only thing better is a similar unit for $9.

BTW- install carefully, and pay attention to details, you already know the consequences of riding something only halfway adjusted.

Also, take a moment to run the chain through your fingers, and make sure the event didn't twit or jam any of the links. If in doubt, order a basic 6-7s chain (same as 5s) in the same order so you don't lose time or need to pay a separate shipping cost.
perfect tips bro , don't worry i will be carefully , and about the chain , you sure that i need ( 6-7s) ? because a friend told me before that will not work for my bike ! , and about the derailleur if you can get another one better that will be great i'm not professional yet to choose without others help

thanks from staten island
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Old 08-13-14, 04:38 PM
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Originally Posted by BIKER2000
perfect tips bro , don't worry i will be carefully , and about the chain , you sure that i need ( 6-7s) ? because a friend told me before that will not work for my bike ! , and about the derailleur if you can get another one better that will be great i'm not professional yet to choose without others help

thanks from staten island
5s and 6s chains are identical, 7s and 8s are slightly narrower, but not by enough to worry about and work fine on 5s. You might ask your friend what he had in mind when he said it wouldn't work.

No I don't have another suggestion for a derailleur, nor a used one sitting around. I was just saying that the only way to improve on the one you found was to find a similar one for less. If I actually thought you could do better, I'd have mentioned another option.
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Old 08-13-14, 04:41 PM
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Originally Posted by FBinNY
5s and 6s chains are identical, 7s and 8s are slightly narrower, but not by enough to worry about and work fine on 5s. You might ask your friend what he had in mind when he said it wouldn't work.

No I don't have another suggestion for a derailleur, nor a used one sitting around. I was just saying that the only way to improve on the one you found was to find a similar one for less. If I actually thought you could do better, I'd have mentioned another option.
ok man i understood the point
i was asking because i found those 2 chains
but i'm gonna order the second one , just searching for better deal

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Old 08-13-14, 04:47 PM
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Originally Posted by BIKER2000
ok man i understood the point
i was asking because i found those 2 chains
You might want to go back and see what the guys with the RD have for you. Even if they charge more for a chain, you could easily make it up saving on the combined shipping vs. 2 separate bills.

Other than that either is fine, you have plenty of lattitude, and choices among chains as long as they say 5s, 6s, or 7s.

If you can't do better, I also have some nice new old stock 6s/7s chains from TAYA which i could sell you for $10.00 inc. postage from New Rochelle.
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Old 08-13-14, 04:53 PM
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Originally Posted by FBinNY
You might want to go back and see what the guys with the RD have for you. Even if they charge more for a chain, you could easily make it up saving on the combined shipping vs. 2 separate bills.

Other than that either is fine, you have plenty of lattitude, and choices among chains as long as they say 5s, 6s, or 7s.

If you can't do better, I also have some nice new old stock 6s/7s chains from TAYA which i could sell you for $10.00 inc. postage from New Rochelle.
don't worry man i know how to buy from amazon ( always search for products with high reviews and free shipping ) i just show you the chain model
hope every thing go ok with this olllllllld bike
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Old 08-13-14, 05:40 PM
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$11... what a steal when you consider all the refinement that trickled down to that thing.
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Old 08-14-14, 05:16 AM
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Originally Posted by ThermionicScott
$11... what a steal when you consider all the refinement that trickled down to that thing.
i can't get your point bro , what you mean ?
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Old 08-14-14, 05:52 AM
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Originally Posted by BIKER2000
i can't get your point bro , what you mean ?
He means that $11 is a great price considering all the expensive development & fine-tuning of derailleurs that have come before.

"Trickle down" often means high quality materials or design that start out on the expensive parts, eventually show up on the less expensive end of the scale. So the "cheap" parts are still very good because they are based on the "good stuff".
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Old 08-14-14, 06:55 AM
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Originally Posted by Homebrew01
He means that $11 is a great price considering all the expensive development & fine-tuning of derailleurs that have come before.

"Trickle down" often means high quality materials or design that start out on the expensive parts, eventually show up on the less expensive end of the scale. So the "cheap" parts are still very good because they are based on the "good stuff".
thanks so much MR.Homebrew01
sounds like im in the right way with the wrong bike hahahahaha
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Old 08-14-14, 07:10 AM
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i'm trying to order the derailleur now but i don't know which size ? the model have 2 sizes

Amazon.com : Shimano Tourney TX35 6/7-speed Rear Derailleur : Sports & Outdoors

6-7 speed & SGS long cage 6-7 speed regular mount ,

what is the differences ?
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Old 08-14-14, 07:18 AM
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The "regular mount" version won't have the claw you need, it's for bike frames that have the hanger built-in instead.
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Old 08-14-14, 07:19 AM
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Long cage means it can handle the extra chain wrap needed with wide range freewheels. Looks like your largest cog in back is 30 or more teeth ?
So, you should probably get the long cage.
If you get a short cage when you need long, then in the small cog combinations, you will have loose chain hanging down because the derailleur cage is not long enough to "hold" it all.
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Old 08-14-14, 08:00 AM
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Originally Posted by Homebrew01
Long cage means it can handle the extra chain wrap needed with wide range freewheels. Looks like your largest cog in back is 30 or more teeth ?
So, you should probably get the long cage.
If you get a short cage when you need long, then in the small cog combinations, you will have loose chain hanging down because the derailleur cage is not long enough to "hold" it all.
i'm so confused , the freewheel is 5 cogs suntour , how to know if it needs the long cage or not ! ,,, an way , what if purchase the long cage when i don't need it ? is that means the whole process will not success ?
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Old 08-14-14, 08:06 AM
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How many teeth on the smallest cog ?
How many teeth on the biggest cog ?
How many teeth on the smallest chainring ?
How many teeth on the biggest chainring ?

Pretty sure you need long cage, and no harm done with that choice. It will just have extra capacity.
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Old 08-14-14, 08:08 AM
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Originally Posted by Homebrew01
How many teeth on the smallest cog ?
How many teeth on the biggest cog ?
How many teeth on the smallest chainring ?
How many teeth on the biggest chainring ?
i will count them now and tell you
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Old 08-14-14, 08:15 AM
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the smallest cog 14 teeth
the biggest cog 29 teeth


i will count the chainring when go home
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Old 08-14-14, 09:21 AM
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Originally Posted by BIKER2000
i'm trying to order the derailleur now but i don't know which size ? the model have 2 sizes

Amazon.com : Shimano Tourney TX35 6/7-speed Rear Derailleur : Sports & Outdoors

6-7 speed & SGS long cage 6-7 speed regular mount ,

what is the differences ?
The listing is a little confusing, but either one would handle your 14-28 freewheel (I re-counted the teeth) just fine. Make sure you buy the one with the claw mount.
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Old 08-14-14, 10:17 AM
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Originally Posted by ThermionicScott
The listing is a little confusing, but either one would handle your 14-28 freewheel (I re-counted the teeth) just fine. Make sure you buy the one with the claw mount.
thanks for your reply , can you please recommend a derailleur and chain for me , i mean giving me direct links or brand name & model for both

thanks in advance
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Old 08-14-14, 10:32 AM
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The derailleur you originally found is fine. As long as it has a claw mount, just about ANY derailleur is fine.

As for cage length, short cages are usually for when there'a less than 27t total difference between the large and small sprockets front + back. Your rear has 14t (28-14t) so that would leave 13t for the front, (ie. 52-39). If the range is wider than that buy a long cage.

In any case, other than a bit of weight, and subtle factors that won't matter to you, there is no penalty to buying a long cage RD when you could use a short cage. So if in doubt, just buy a long cage, with claw mount. EXACTLY like the photo of the first one you found way early in the thread.

Don't let more info distract and confuse you from what is a basic and simple decision. You were on the right track early on, and should stay there instead of getting shunted onto a siding.
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Old 08-14-14, 10:45 AM
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Originally Posted by FBinNY
The derailleur you originally found is fine. As long as it has a claw mount, just about ANY derailleur is fine.

As for cage length, short cages are usually for when there'a less than 27t total difference between the large and small sprockets front + back. Your rear has 14t (28-14t) so that would leave 13t for the front, (ie. 52-39). If the range is wider than that buy a long cage.

In any case, other than a bit of weight, and subtle factors that won't matter to you, there is no penalty to buying a long cage RD when you could use a short cage. So if in doubt, just buy a long cage, with claw mount. EXACTLY like the photo of the first one you found way early in the thread.

Don't let more info distract and confuse you from what is a basic and simple decision. You were on the right track early on, and should stay there instead of getting shunted onto a siding.
i agree with you bro , i will take it easy , i have 2 other bikes but i'm willing to repair this because i want to learn every thing about bikes world , so sometimes i feel confused but i will take it easy next time
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