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Posted on Sep 27, 2009
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Need to replace a Shimano 7 speed SIS rear derailleur for a Quest Omega 21 speed mountain bike

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  • Master 484 Answers
  • Posted on Oct 23, 2009
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Joined: Jul 28, 2009
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Go to parktool.com/repair for pretty great step-by-step instructions with diagrams and pictures on the procedure. It would be easier to see than to try to tell.

i hope this helps you out,
matthew

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3answers

Replacing a rear derailleur on a 21 speed mongoose aluminum alloy mountain bike xr100 need a step-by-step on how to put a Shimano derailleur on repair manual can you please help me

I had a look at the Mongoose website.
They have manual for download.

https://int.mongoose.com/pages/product-manuals

Enter the model of your bike, or look for a picture of it.
Follow the instructions....

REgards
Geoff
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Shimano front derailleur manual

ContaCT YOUR LOCAL BIKE SHOP FOR ASSISTANCE
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How do I install a mountain bike (21 speed) roller/changer

If you can figure out what it's really called look it up at http://techdocs.shimano.com/techdocs/index.jsp

Go here for a great resource for procedures...

http://www.parktool.com/blog/repair-help

Point to the bike and it will highlight a link.
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1answer

Where can i get replacement front derailleur? or specs sheet ?thanks peter

The documentation I found says the Front derailleur is a Falcon MF 31 T.

But there's more that needs to be known about it.

It appears to be a Top Pull, meaning the cable approaches it from above and the 31T means it works with a front chainring of 31 teeth.

We need to determine the exact outside diameter (to the .1 mm) of the seat tube as the clamp must be precisely fitted. Typical measurements look like 28.6 mm or 31-1/8".

Once you know that you can go anywhere (eBay, for example) and order the same pos derailleur or upgrade to a Shimano Deore or above mountain derailleur.

Google this but keep in mind you still need to specify the clamp size
"shimano front derailleur top pull 31"





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1answer

Where can I find a drawing of a 21 speed 26" mongoose duel supp rear deralier so I can see how the cable runs?

http://www.amazon.com/gp/product/images/B000B8IDS2/ref=dp_image_text_0?ie=UTF8&n=3375251&s=sporting-goods If it has a Shimano Altus rear derailleur, you can look here:http://bicycletutor.com/adjust-rear-derailleur/comment-page-3/ or here:http://www.parktool.com/repair/readhowto.asp?id=76
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