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upgrading kid's bike-tourney rear der

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upgrading kid's bike-tourney rear der

Old 05-18-16, 01:49 PM
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Bikegal123
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upgrading kid's bike-tourney rear der



I'm going to upgrade my son's bike to 7 speed integrated shifters and rear freewheel. (from 6 spd gripshift) I'd like to put on a tiagra road der der. in the meantime. What are my options with this tourney TX setup? I read I cannot directly install a traditional rear der due to the integrated hanger. Read that sunrace has an index hanger plate. Anything other options/ideas? thanks
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Old 05-18-16, 02:24 PM
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In your case, the Tiagra rear derailleur will bolt onto your son's frame. Most Tourney installations use a "claw" attached to the rear derailleur but your son's bike isn't that design.

What 7-speed freewheel? If you are planning to use a freewheel with a 34 tooth big cog, and you are buying a new derailleur for it, I'd get an Alivio insted. I'm pretty sure that the Tiagra is only rated for a 27 t big cog. Another choice, if it isn't damaged some way would be to keep your existing Tourney derailleur. It'll work.
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Old 05-18-16, 02:28 PM
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Originally Posted by Retro Grouch View Post
In your case, the Tiagra rear derailleur will bolt onto your son's frame. Most Tourney installations use a "claw" attached to the rear derailleur but your son's bike isn't that design.

What 7-speed freewheel? If you are planning to use a freewheel with a 34 tooth big cog, and you are buying a new derailleur for it, I'd get an Alivio insted. I'm pretty sure that the Tiagra is only rated for a 27 t big cog. Another choice, if it isn't damaged some way would be to keep your existing Tourney derailleur. It'll work.
Alivio, or Acera, or some other consumer grade long cage mountain derailleur.
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Old 05-18-16, 03:14 PM
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I don't see much reason for a Tiagra.
I'd see how the Tourney works first.
New Tiagra's are 10 speed.
That may be too narrow of a cage for your wider 7 speed chain, resulting in some chain rub that you wouldn't get otherwise.
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Old 05-18-16, 03:23 PM
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Don't give up on Tourney

Read this thread of mine and in particular the last video link I posted. Toruney RD can be tuned well.
http://www.bikeforums.net/bicycle-me...is-cranks.html

I replaced my kids revo twist shifters with the Shimano EZ31 rapid fire shifters and they work very well together.


Originally Posted by Bikegal123 View Post


I'm going to upgrade my son's bike to 7 speed integrated shifters and rear freewheel. (from 6 spd gripshift) I'd like to put on a tiagra road der der. in the meantime. What are my options with this tourney TX setup? I read I cannot directly install a traditional rear der due to the integrated hanger. Read that sunrace has an index hanger plate. Anything other options/ideas? thanks
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Old 05-18-16, 07:16 PM
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Thanks for the info. Nothing wrong with tourney, it shifts good. I'm going from 6 spd gripshift to 7 spd integrated lever/shifter for his brakes, little hands. I just had some old 8/9 spd road parts and thought that would be a good upgrade for weight and would hang so low.
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Old 05-18-16, 07:27 PM
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By Integrated do you mean STI?

Originally Posted by Bikegal123 View Post
Thanks for the info. Nothing wrong with tourney, it shifts good. I'm going from 6 spd gripshift to 7 spd integrated lever/shifter for his brakes, little hands. I just had some old 8/9 spd road parts and thought that would be a good upgrade for weight and would hang so low.
By integrate shifters did you mean STI or the brake/shifters where the brakes and trigger shifters are in the one unit?

Be warned that the 8 speed STIs (Claris) have a rather long pull on them when up shifting and even my 12 year old struggles and he has big hands
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Old 05-18-16, 07:53 PM
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Tourneys like that are a little weird with their offset pivot but not Shadow parallelogram... but still, should be ok replaced by any 7-8-9 speed, SGS (long cage) unit like Acera, Alivio, Altus, and older (pre-10-speed) models of the higher groups. But if it ain't broke why fix it?
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Old 05-18-16, 09:17 PM
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Inpd, I mean EF-51 shimano levers. Yes, darth L, I probably don't need to replace. Best I wait until he bends it, huh? Weigh weenie in me i guess. Thanks.
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Old 05-18-16, 10:55 PM
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Originally Posted by Bikegal123 View Post
I just had some old 8/9 spd road parts and thought that would be a good upgrade for weight and would hang so low.
Kids' bikes are usually really heavy. Even if you were able to save a few grams by swapping the rear derailleur, nobody'll notice on a 35 pound bike.

As for how low the current derailleur hangs... A long cage mountain bike derailleur might be necessary, depending on the bike's gearing. Road derailleurs, regardless of cage length, often aren't built to handle extra large cogs on a freewheel. A 9-speed Tiagra RD-4500 derailleur is rated for a maximum of 27 teeth. And if the bike has a triple crankset along with a wide-range freewheel, a short cage derailleur may not have the wrap capacity needed to handle the difference between the highest and lowest gears.
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