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Can I replace a Shimano RD-TY15 with a Shimano Tourney TX?

My bike is a 15 speed Hybrid& the derailleur the bike mechanic put on tonight doesn't seem to change gears well when I am on the big gear in the front & want to shift upwards on the back

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It looks like you have had a 6/7 speed rear mech fitted.

Unfortunately this number of gears is only replaceable by another 5 speed rear derailleur, and Shimano only has two, the RD-TY15SS, and RD-TY15GS.
(See Shimano's Compatibility info PDF here:
http://si.shimano.com/php/download.php?file=pdf/dm/DM-RD0001-02-ENG.pdf
There is also the compatible Sunrace Brand Alternative, RDM15, viewable here:
Sunrace

If you don't use these, you are bound to have shifting problems due to the more narrow space difference between cogs on a six speed freewheel/sprocket.

Posted on Aug 24, 2015

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This may be to do with the replacement having a shorter cage, so it can't go on the big sprocket and big chain ring at the same time.

Try to not use the big rear sproket and the the big front chaining at at the same time,

Posted on Apr 30, 2015

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1 Answer

Why cant I find any information on my Shimano Tourney RD-TY10 rear derailleur?


Because it's been out of production for some time. There's no useful info to be had anyway. It is adjusted the same as most any rear friction derailleur. It is not useable with indexed levers (click to shift). If you really think you need info do the following Google search: "RD-TY10 site:shimano.com" and scroll through the results.

I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

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Can I replace a Shimano RD-TY15 with Shimano Tourney TX?


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The Tourney pictured has a built in hanger (below link) just make sure the replacement does.

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Shimano Tourney rear derailleur is stuck on smallest gear and will not shift. How do I adjust the tension correctly?


There are several things that could be wrong. You could have thrown your chain (you couldn't ride at all if so). The bike could have been crashed and the derailleur bent. The cable might have slipped where it bolts to the derailleur. Or the cable or shifter could need maintenance, too. It is most likely one of the above. If it is only the adjustment, there are two stop screws on the derailleur that can be adjusted.

My best advice for you is to either find a bicycle repair manual at a local bookstore or your library that can show you some of the detail. Or just let your local bike shop do the repair.

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