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


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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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