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Help with rear derailleur

Old 10-23-11, 04:38 AM
  #1  
yani2k8
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Help with rear derailleur

Hello

I'm new to the forum so I'm sorry if I've posted this in the wrong section.

Anyway, the rear derailleur on my bike broke so I need to buy a new one, but I've no clue what I should be looking for.

The bike is an Apollo Outrage mountain bike. The derailleur is Shimano, either an RD-MR40 or RD-TY30. That's what it says in the manual but I don't know which of the two it is.

I was able to find a second-hand MR40 online but no TY30.

So my question is - can I buy any Shimano rear derailleur, or does it have to be the exact same model as the previous one?

Many thanks in advance!
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Old 10-23-11, 06:41 AM
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derailuer help

It is my understanding that if you get a Shimano mountain bike style deraileur you should be good to go. Other than price points and precision and fanciness, they work off the same standards. The main thing is knowing whether your shifters work on a 2-1 or a 1-1 ratio. All the modern Shimano stuff is 2-1.
I hope someone can confirm this.
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Old 10-23-11, 08:59 AM
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How do I know if the shifters work on a 2-1 or a 1-1 ratio? The bike was purchased in 2003 so it's fairly old.

Thanks.
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Old 10-23-11, 09:27 AM
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yani2k8
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Also, I just looked at the derailuer and it says:

Shimano
Rapid Rise
Comfort
030 Technology
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Old 10-23-11, 09:35 AM
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Originally Posted by yani2k8 View Post
How do I know if the shifters work on a 2-1 or a 1-1 ratio? The bike was purchased in 2003 so it's fairly old.

Thanks.
It's obvious from the fact that they worked with the original Shimano derailleur. Simply buy the Shimano mtn derailleur of your choice, and you'll be fine. Odds are you won't find the exact model you have because many of the lower end RDs aren't sold as replacement parts. No loss there as this is a good time to upgrade a bit, and you should be able to find a bargain on a mid range model if you search around.
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Old 10-23-11, 12:46 PM
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Originally Posted by FBinNY View Post
It's obvious from the fact that they worked with the original Shimano derailleur. Simply buy the Shimano mtn derailleur of your choice, and you'll be fine. Odds are you won't find the exact model you have because many of the lower end RDs aren't sold as replacement parts. No loss there as this is a good time to upgrade a bit, and you should be able to find a bargain on a mid range model if you search around.
With the caveat that he's got a rapid rise derailleur, and if he buys a regular one, his shifters will work backwards. I'm not sure he's got a choice, though.

OP: derailleurs shift by pulling the cable one way, and a spring pulling them back the other way when cable tension is reduced. For most rear derailleurs, the cable pulls the deraileur towards the lower gears (the ones with more teeth), and the spring pulls towards the higher gears. Rapid rise is Shimano's trademark for derailleurs that work the other way around. A normal one will work just fine, except the shifting is backwards. I don't think that shimano makes rapid rise stuff any more, as it proved unpopular (I rather like it, because it makes shifting into a lower gear faster and easier.). If that bothers you, you can either search for one, or buy new shifter.
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Old 10-23-11, 11:56 PM
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Thanks for all the input!

I'm not really concerned if shifting is backwards, as long as my bike is rideable

I ordered a second-hand Shimano RD-MR40 for £6.50 including postage and I'll get my dad to replace it for me!

I just hope it arrives quickly because getting to uni campus on foot is a killer!
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Old 10-24-11, 08:09 AM
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In what way did it break ? Sometimes one part breaks, or is out of adjustment, and people think the cause is a different part.
Got pictures ?
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Old 10-24-11, 04:00 PM
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It fell off the roof of the car at 85mph and the mech snapped in two :S
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Old 10-24-11, 04:09 PM
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If the bike fell of a car at high speed, would consider that the whole bike many be scrap; would suspect there is more damage than just the RD.

Being realistic most Apollo branded bike falls into the BSO catagory, or very low end, and replacing any part will soon cost more than a new bike.

Saying that, if you are using if for Uni, the more of a wreck it looks, the better.
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Old 10-24-11, 04:10 PM
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Originally Posted by FBinNY View Post
It's obvious from the fact that they worked with the original Shimano derailleur. Simply buy the Shimano mtn derailleur of your choice, and you'll be fine.
It's my understanding that Shimano 10-speed mountain type rear derailleurs have a new actuation ratio and are compatible with only 10-speed Shimano mountain type shifters. There have been several posts here confirming this issue. All pre-10-speed mountain rear derailleurs have the same actuation ratio as Shimano STI road shifters. Shimano 9-speed mountain rear derailleurs will work with Shimano STI 10-speed road shifters.

Shimano 10-speed rear mountain derailleurs would no be compatible with the OP's rear shifter.
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