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-   -   Shimano Tourney TX-31 and TX-51RD (https://www.bikeforums.net/bicycle-mechanics/665057-shimano-tourney-tx-31-tx-51rd.html)

CPFITNESS 07-23-10 07:37 AM

Shimano Tourney TX-31 and TX-51RD
 
These are all over the place for dirt cheap. Anyone have any experience with them? what are the diffeences between the 2 model numbers. I presently have a 14-34 megarange 7speed freewheel on my vintage road bike and installed a triple up front. My old suntour actually handles the 34 tooth alright but there are some minor issues with granny up front and taking up the chain. Originally I was going to keep the bike somewhat vintage but now, I've modernized the damn thing so much I might as well throw a proper RD on their and perhaps get some indexed downtube shifters. This seems like a dirt cheap way to do it.

I'm also probably going to get rid of the 34 tooth megarange since I have the granny gear up front now but I still think I need the longer cage to deal with the take up issue anyways correct?

EDIT, There is also a TX-71 i noticed the 51 and 71 have a little wheel on them that the cable runs through. I thought i saw a thread on here about that but I forget what the purpose of it was. Generally a higher model number indicates a better product and they are all so cheap I'm leaning towards the 71 since it seems like it should be a better product, but I'm wondering specifically if anything makes them better or is this just old product that never caught on that was wholesaled out and now available for cheap.

wunderkind 07-23-10 09:41 AM

One of my old hardtail MTB that I have a Tourney RD. It has the little wheelie you talk about. That thing shift so bloody well that I have no compelling reason to "upgrade". I dare say it shifts as good as my rd7800 unit on my roadbike. I think alot of it has to do with proper cable/derailleur tuning.

It is a chunky unit though. You can see the reviews over at Amazon.com

TurbineBlade 07-23-10 10:23 AM

Ditto. I have one running now and it probably shifts just as well as my deore on another bike. There's no problems with it -- it's just ugly and a bit chunky, as the above said ;).

DArthurBrown 07-23-10 02:11 PM

The Tourney rear derailleurs work fine, but will wear out more quickly than Sora, Alivio, or better types, but they'll still last several years for most folks. Don't feel bad about spoiling a vintage road bike with cheaper modern stuff. It's a great way to learn about bikes and to get into the sport inexpensively. The tourney derailleurs are also far far superior to the older rear derailleurs found on road bikes from the 1980's.

The differences between Tourney models are gimmicky. They all work about the same.

CPFITNESS 07-23-10 08:02 PM

awesome info guys, just what i was looking for. I'm gonna pick up 2 or 3 of them at those prices. one for the vintage and one to replace the mangled up 2200 series on my rapid 3. I got ran off the road 6 weeks after getting that bike and the RD got scraped up pretty good and it's never quite shifted as crisply since.
i figured if it was a cheapo MTB derailer and durability was an issue, it would be less of an issue if its relegated to road duty and not going to get knocked around as much and filled up with dirt.

wunderkind 07-23-10 10:50 PM

whoa there chief..... is the rapid 3 8spd? If so, I don't think the Tourney will match properly. Can try I guess. I thought Tourneys are 7spd only.

DArthurBrown 07-24-10 01:39 AM

All modern Shimano derailleurs are compatible regardless of the number of speeds they're marketed for. The amount of derailleur swing is identical on all modern Shimano derailleurs. Only the shifters are set up differently to index to different number of speeds. You can use a Tourney derailleur with cheap-o 6 speed stem shifters or go nuts and use them with 9-speed dura-ace bar-end shifters. I've done just that.

TurbineBlade 07-24-10 04:17 AM

Yeah, my tourney is stupidly listed as "7 speed" on some online sites but is actually friction shifting an 8 speed set up.

It'll work fine.

gitarzan 07-24-10 04:54 AM

Tourneys are made with lower end products, lots of plastic and stamped sheet metal but shift very well. For the money they are a bargain. What they lack in durability, they make up for in the functionality/price ratio.


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