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Old 07-03-11, 02:08 PM   #1
Normster
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GT rear mech - 1990's (need a replacement)

I'm confused and hope someone can advise me. I'm looking to tidy up my old GT outpost, 1990's model. I'd like to get a new rear mech for it (mine is a little slack), but am not sure what type to get. I have what I assume is the original SunTour mech, which has no hanger, which confuses me. The hanger is built into the frame and mech bolts onto the frame. Let me kow if I am talking out of my rear end please :-). Anyone got any advice on what rear mech might work for me? A model or picture would be nice.
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Old 07-03-11, 03:47 PM   #2
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All but really cheap supermarket bikes come with the hanger 'built in' to the frame.

For a replacement, being a mid-90's bike, it will be 7 speed, so any Shimano, say from the Atlus or Acera range will work fine.

Would be worth changing the cable at the same time, if you havent already done this; also would be worth checking that it isn't the cable that is causing you issues with the mech being slack.
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Old 07-03-11, 04:05 PM   #3
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I just got my 1995 GT Outpost Trails RD replaced; went with a Shimano Deore, which is a step above the Acera line. Have gone 80+ miles on it now, loving how smooth it shifts, so I'm pretty happy with it. May be a bit pricier than most would consider for an old GT Outpost, but due to my weight I have to keep this frame until I lose a lot more weight; so I don't mind putting expensive parts on it; I plan to ride the hell out of them.
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Old 07-03-11, 05:46 PM   #4
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Thanks, I'll try the cable first.
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Old 07-03-11, 05:53 PM   #5
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Keep cycling. The bike is a key part of my diet.
My gt is showing it's age. I'll sort the shifting, then see what's next to be done
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Old 07-03-11, 06:07 PM   #6
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Originally Posted by Normster View Post
I'm confused and hope someone can advise me. I'm looking to tidy up my old GT outpost, 1990's model. I'd like to get a new rear mech for it (mine is a little slack), but am not sure what type to get. I have what I assume is the original SunTour mech, which has no hanger, which confuses me. The hanger is built into the frame and mech bolts onto the frame. Let me kow if I am talking out of my rear end please :-). Anyone got any advice on what rear mech might work for me? A model or picture would be nice.

If it is indeed a SunTour, then you'll need to find a SunTour replacement for the indexing to work correctly. If it's Shimano, then any Shimano derailleur made since then will work (with very minor exceptions.
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Old 07-03-11, 06:55 PM   #7
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http://cgi.ebay.ca/P-MANETTES-SHIMAN...item2eb5dd0fe1

That's not my eBay auction so I hope I can post it. Anyway, those are Shimano SL-MC41 eight speed rapidfire shifters. Why am I showing this? Because if Suntour rear derailleurs are more difficult to find, I would also change the shifters. STX-RC in 1999 was actually Deore except I was told by a webmaster on the history of Shimano parts (forgot which site but it was German) that those shifters have parts inside superior to Deore and only surpassed by XT. So, I guess they're selling pretty cheap maybe because people don't even know what they are.

The lineup kind of goes like this: Shimano Tourney, Altus, Acera, Alivio, Deore, Deore LX or SLX, Deore XT etc. I've read that when going from Alivio to Deore there's a significant difference in quality over time (Deore shifts better with fewer adjustments over time according to what I read).

So, I guess you'd only have to find out if your rear wheel can take an 8 speed cassette or freewheel. Well, actually, you could always find 7 speed ones on eBay as well. I mean I once found Shimano Deore DX on eBay pretty cheap probably for the same reason. People don't know what it is. DX was said to be close to XT in quality levels.

If I was rich right now, I'd probably be buying little-known stuff like that on eBay to build bicycles for the fun of it. Heck, if I then sold those bicycles, I bet the owners would be pround of their gear.
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Old 07-03-11, 07:15 PM   #8
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STX-RC in 1999 was actually Deore except I was told by a webmaster on the history of Shimano parts (forgot which site but it was German) that those shifters have parts inside superior to Deore and only surpassed by XT.
STX was renamed Deore in the transition to 9-speed. (There was no Deore-nosuffix in the '90's.) For example, the M510 Deore hubs use many of the same parts as STX.

STX-RC borrowed a lot of bits from Deore XT of that era.
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Old 07-03-11, 07:15 PM   #9
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I've been told by multiple bike shops that there's no way to get an 8+ speed cassette on my 1995 GT Outpost Trail. I don't know if other models had a wide enough rear triangle, but according to bikepedia, all the Outposts/Outpost Trails up to 2000 only had 7 speeds.


As for the shifters, I had to go with these: http://velospec.com/components/shimano/stm405

They're Alivio branded, and I've had one break on me within the first hour of using it (bike shop replaced it free of charge), but they've been steady ever since. The right shifter (7 speed) tends to get a little sticky after hours of constant use, but it always goes away overnight and feels new on the next ride. Not sure what causes that, and in fact since I replaced the RD 2 days ago I cannot recall feeling the stickiness anymore, but I'll have to pay more attention; I may have just ignored it since I'm used to it.

Last edited by Mithrandir; 07-03-11 at 07:19 PM.
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Old 07-03-11, 07:46 PM   #10
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Keep cycling. The bike is a key part of my diet.
I find the brake pads to be a chewy low-calorie substitute for chewing gum.
SRAM stuff definitely tastes better than Shimano. Yum!

I know what you mean, Normster! Without bicycles, I'd probably be a Really Big Guy!
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Old 07-03-11, 09:14 PM   #11
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I find the brake pads to be a chewy low-calorie substitute for chewing gum.
SRAM stuff definitely tastes better than Shimano. Yum!

I know what you mean, Normster! Without bicycles, I'd probably be a Really Big Guy!

I think you need more fiber in your diet- carbon fiber.
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Old 07-03-11, 09:17 PM   #12
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Originally Posted by Mithrandir View Post
I've been told by multiple bike shops that there's no way to get an 8+ speed cassette on my 1995 GT Outpost Trail. I don't know if other models had a wide enough rear triangle, but according to bikepedia, all the Outposts/Outpost Trails up to 2000 only had 7 speeds.
It's not the triangle, it's the length of the cassette body. In order to fit an 8-speed cassette, you would have to change the cassette body or the rear hub or the whole wheel. Considering the quality of the bike, swapping the whole wheel would make the most sense money-wise.
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Old 07-03-11, 09:24 PM   #13
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STX was renamed Deore in the transition to 9-speed. (There was no Deore-nosuffix in the '90's.) For example, the M510 Deore hubs use many of the same parts as STX.

STX-RC borrowed a lot of bits from Deore XT of that era.
I kind of doubt that. Shimano's hierarchy is pretty apparent if you look at the part number designations. For instance, the XTR stuff is M9xx, Deore XT is M7xx, Deore is (was) M5xx, and so on. STX-RC is MC33: fairly far down and one or two steps above Acera/Alivio. Still perfectly usable, and I bet plenty of the small parts interchange, but the same? Not likely.
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Old 07-03-11, 11:42 PM   #14
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<redacted>

Last edited by laura*; 07-10-11 at 12:34 AM.
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Old 07-04-11, 02:23 PM   #15
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I'll have to go through this thread real slooooooow, cos it's gone a bit quick for me. Here's a couple of images of the rear mech. Or is that "rear mangled"? :-). Just to continue the thread, and show that the rear mech could do with replacing? (And the cable). My original confusion was perhaps to avoid getting the wrong mech (not sure of the hanger type), though comparing to my Raleigh, which has a hanger that hooks on the axle, it's looking a bit more obvious now that my GT does not have any kind of complicated hanger.
Attached Images
File Type: jpg rd2.jpg (88.9 KB, 11 views)
File Type: jpg rd1.jpg (99.1 KB, 13 views)

Last edited by Normster; 07-04-11 at 02:25 PM. Reason: ... I cannot smell.
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Old 07-04-11, 07:39 PM   #16
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Thanks Laura for the informative post. This topic is so interesting, I think we'll skip the original poster's question and focus on the history of Shimano parts. lol, I'm joking.

But, really, I did want to point out a couple of sites I found on the history of Shimano parts:
In English: http://datenbanken.freepage.de/traut/SHIMANO.html

In German: http://www.fa-technik.adfc.de/Herste...o/Gruppen.html
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Old 07-04-11, 11:26 PM   #17
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First off, STX vs Deore:
Excellent info. Thank you.

We now return you to your regularly scheduled thread.
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