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Suntour Cyclone GT RD and Shimano freewheel hubset

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Suntour Cyclone GT RD and Shimano freewheel hubset

Old 12-26-17, 03:28 PM
  #1  
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Suntour Cyclone GT RD and Shimano freewheel hubset

Suntour Cyclone GT RD. Missing cable anchor bolt. It has a little bit of rash on the body but the pivots are still tight.
$30 shipped in the continental US. Payment via PayPal
SOLD

Price drop to $20 shipped on the hubs.

Shimano freewheel hubset. Has the old oiling hole. Not sure of the model. 36 hole. Front has never been built and does not have the quick release. Rear has been built and does include quick release. $20 shipped in continental US. Payment via Paypal. Price on hubset lowered to $20 shipped

[IMG]Untitled by Andy Beichler, on Flickr[/IMG]
[IMG]Untitled by Andy Beichler, on Flickr[/IMG]
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Last edited by beicster; 01-01-18 at 09:30 AM. Reason: Price drop
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Old 12-26-17, 04:09 PM
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I believe the hubs are early 600. I have the same set but wore out the cups on the front hub.
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Old 12-26-17, 04:10 PM
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Q; what are the 2 letter date code on the hubs?
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Old 12-26-17, 04:31 PM
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Originally Posted by 3speedslow View Post
Q; what are the 2 letter date code on the hubs?
D F on the rear. E L on the front.
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Old 12-26-17, 05:29 PM
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Originally Posted by beicster View Post
d f on the rear. E l on the front.
1978/79?
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Old 12-26-17, 05:52 PM
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Originally Posted by mountaindave View Post
1978/79?
D= 1979 and E= 1980
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Old 12-26-17, 07:03 PM
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Ah, did my alphabet math wrong. O is 1990, easy to remember so I use that as my benchmark.
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Old 12-26-17, 09:54 PM
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Couple of questions about the Cyclone GT medium cage RD. I'm still pondering a slight modification to my '89 Centurion Ironman to accommodate a freewheel up to a 28 tooth large cog; and to reduce the cage pivot spring tension, compared with the original Suntour GPX.

Will it work with a 7-speed Suntour freewheel? (Friction is fine, doesn't need to be indexed since the GPX will do both.)

Is the cage pivot spring tension adjustable? Some rear derailleurs have a second hole/slot for the spring, some don't.

Thanks.
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Old 12-27-17, 12:25 AM
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I would be very surprised if it didn’t shift 7s. I have a Cyclone GT shifting 7s right now. Works like a champ.

Last edited by mountaindave; 12-27-17 at 12:34 AM.
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Old 12-27-17, 05:38 AM
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It will definitely shift 7 speeds. I will check on the adjustable tension and let you know.
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Old 12-27-17, 11:35 AM
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Even if there is no 2nd hole on the cage to adjust spring tension, you should still be able to do it in another way.

The pivot, piece 21 in the attached diagram, has 6 possible ways to attach the spring, you just choose which indent you place the spring into if that makes sense, and you should be able to experiment with it till you get the desired tension.

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Old 12-27-17, 11:50 AM
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Originally Posted by canklecat View Post

Is the cage pivot spring tension adjustable? Some rear derailleurs have a second hole/slot for the spring, some don't.

Thanks.
I just realized what you meant. I don't want to take it apart to check and then have to fuss with it to get it together. I am good with taking apart most things but I don't like to fool with hidden springs under tension. I inevitably end up with bloody fingers because I am pretty ham handed.
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Old 12-27-17, 12:02 PM
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Originally Posted by beicster View Post
I just realized what you meant. I don't want to take it apart to check and then have to fuss with it to get it together. I am good with taking apart most things but I don't like to fool with hidden springs under tension. I inevitably end up with bloody fingers because I am pretty ham handed.
Thanks, but no need to disassemble. That diagram @F.Bacchus posted shows it should have adjustable spring tension, which confirms what @jimmuller described in this thread. That derailleur might do the trick for making my road bike a bit more hill friendly.

One quirk I've noticed with the original Suntour GPX short cage derailleur on my Centurion Ironman is excessive drive train tension in the biggest freewheel cogs. Not sure why, but it forces much more resistance than my hybrids with long cage derailleurs in comparable gears. Best I can figure after disassembling the GPX derailleur is the cage pivot spring tension is way too high. And the GPX RD has no provision for adjustment, unless I drilled a hole for the leg or finger in the spring to reset it. I'd rather not do that until I've tried another derailleur.

It may just be a difference in the way short, medium and long cage derailleurs are designed. My best guess is that short cage derailleurs were designed for corn cob spacing and "large" cogs of only 21 teeth, from an era when men were men and few men were beasts like Eddy Merckx, Bernard Hinault and Greg LeMond. So while some short cage derailleurs *can* handle freewheels up to 28T, it may not be the best solution. I've tried a 13-25 SunRace freewheel and it was no better -- same excessive drive train tension in the big cog.

I do have another short cage RD, an older Shimano purchased from another BF member several weeks ago, but haven't tried it yet. Just testing it by hand it has the same heavy cage pivot tension, so I doubt it will help the peculiar problem I'm trying to solve.

I was able to manage most hill climbs locally in the factory stock 42 chain ring and 24 freewheel cog, but that was when I was riding hard several times a week. The past month I barely have time for one ride a week and my legs and lungs need a little help on some roller coaster routes.

I know I can handle even the worst climbs with dead legs in the 40 chain ring and 28 freewheel cog on my Univega hybrid, so that should be plenty for my lighter weight road bike, especially after swapping to a 39T smaller chain ring.

Last edited by canklecat; 12-27-17 at 12:10 PM.
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Old 12-27-17, 01:57 PM
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@canklecat just send me a DM if you are interested.
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Old 12-27-17, 04:02 PM
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Andy, this is the long cage GT version right? If so, I'll take the Cyclone RD. I figure I can cobble up an anchor bolt of sorts. PM coming in for payment info.
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Old 12-27-17, 04:47 PM
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Derailleur sold. Thanks.

Hubs still available.
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Old 12-29-17, 08:25 AM
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Bump for price drop on hubset. $25 shipped in continental US.
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Old 01-03-18, 06:03 PM
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Bump for price drop on hubset-$20 shipped in continental US
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