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Experimenting with drivetrain

Old 01-10-23, 12:24 PM
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52telecaster
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Experimenting with drivetrain

The suntour Vx-GT will do amazing stuff if 7 speeds is enough. I have odd tastes in cassettes and am experimenting for a future bike build. Current idea is
13-14-16-18-21-28-36. I was wondering what derailleur I would need. Since I have several Vx-GTs I thought I'd give it a shot. Man it just worked perfectly!

7 speeds and the truth right here.

No issue at all climbing this on a 1971 Raleigh professional.
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Old 01-10-23, 12:32 PM
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That is the "AIG" of bailout gears!
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Old 01-10-23, 12:35 PM
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So its like Shimano Megarange, just beats that? Cool experiment
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Old 01-10-23, 12:39 PM
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There is no better cheap derailleur ever made to rival the shiny cheapness of the VXs.

Amazing little guys.
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Old 01-10-23, 12:45 PM
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Is this a1X or 2X ?
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Old 01-10-23, 12:48 PM
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Originally Posted by 3speedslow View Post
Is this a1X or 2X ?
It'll be a 2x where I have 26-44 in front. The 44 will be in position to use all 7 gears the 26 will be restricted to the 28 and 36.
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Old 01-10-23, 12:49 PM
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What chain ring(s) do you have up front?
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Old 01-10-23, 12:52 PM
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Originally Posted by Bad Lag View Post
What chain ring(s) do you have up front?
See above.
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Old 01-10-23, 12:58 PM
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Originally Posted by 52telecaster View Post
It'll be a 2x where I have 26-44 in front. The 44 will be in position to use all 7 gears the 26 will be restricted to the 28 and 36.
So is your chainline inboard a little bit compared to what is considered normal? Curious for the details since your gearing experiments are consistently interesting and mirror what I need in the hills where I live. Thanks!
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Old 01-10-23, 01:09 PM
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I love this setup. Suntour VX-GT is the best. I would love to read more about how you built this freewheel.

Please show us your Crankset, Chainrings and FD also.
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Old 01-10-23, 01:12 PM
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Originally Posted by noobinsf View Post
So is your chainline inboard a little bit compared to what is considered normal? Curious for the details since your gearing experiments are consistently interesting and mirror what I need in the hills where I live. Thanks!
Yeah the granny will be as close to the frame as possible.
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Old 01-10-23, 01:15 PM
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Originally Posted by vonfilm View Post
I love this setup. Suntour VX-GT is the best. I would love to read more about how you built this freewheel.

Please show us your Crankset, Chainrings and FD also.
Just in the experimental stage but the cassette is cobbled together from a 7 speed cassette and spacers with cogs from other cassettes. Since it's friction shifting there is wide latitude for using different cogs.
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Old 01-10-23, 01:36 PM
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Originally Posted by 52telecaster View Post
Just in the experimental stage but the cassette is cobbled together from a 7 speed cassette and spacers with cogs from other cassettes. Since it's friction shifting there is wide latitude for using different cogs.
The amazing thing is that my SunTour (and very Japanese; I presume JIS) Supberbe shifters work well with no modifications on a later, 9-speed Campagnolo (I resume ISO) drivetrain. I don't know how that happened but I'll take it.
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Old 01-10-23, 01:37 PM
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Originally Posted by 79pmooney View Post
The amazing thing is that my SunTour (and very Japanese; I presume JIS) Supberbe shifters work well with no modifications on a later, 9-speed Campagnolo (I resume ISO) drivetrain. I don't know how that happened but I'll take it.
Kismet!
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Old 01-10-23, 02:08 PM
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The Suntour Vx-GT RD works really well with the Racheting Power Shifters. I put those together on one of my wife's bikes and she really likes the combo.
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Old 01-10-23, 02:21 PM
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Originally Posted by daverup View Post
The Suntour Vx-GT RD works really well with the Racheting Power Shifters. I put those together on one of my wife's bikes and she really likes the combo.
Suntour barcons are my go to. Same thing really.
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Old 01-10-23, 03:01 PM
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Huret Duopar with its unique 2 stage pulley cage could handle a spread like this I believe. I got rid of my eco-duopar since that upper pulley squealed for lack of lube and I could find no way to service it.
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Old 01-10-23, 03:03 PM
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Good to know, Thanks!
Tim
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Old 01-10-23, 03:19 PM
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Originally Posted by masi61 View Post
Huret Duopar with its unique 2 stage pulley cage could handle a spread like this I believe. I got rid of my eco-duopar since that upper pulley squealed for lack of lube and I could find no way to service it.
I have an eco but it's a bit rarer so I'd rather not use it. Great derailleur though.
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Old 01-10-23, 03:51 PM
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It's amazing how "right" Suntour got it 50 years ago.

We don't see a lot of the "show your favorite derailleur for touring" or whatever threads these days- but the V-GT Luxe was THE dominant RD for 15 or so years- up until the M730 XT units- and might even have more range than those SGS units.
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Old 01-10-23, 03:52 PM
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I am not surprised that this works well, since 14-34 was a very common Nishiki 5-speed freewheel during the 1970s, and the SunTour VGTs of the day handled it with aplomb.

What really surprised one of my coworkers was that the old VGT I gave him worked well on his daughter's indexed Shimano 7-speed setup, better than the original Shimano she had destroyed in a crash.
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Old 01-10-23, 03:59 PM
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Originally Posted by John E View Post
I am not surprised that this works well, since 14-34 was a very common Nishiki 5-speed freewheel during the 1970s, and the SunTour VGTs of the day handled it with aplomb.

What really surprised one of my coworkers was that the old VGT I gave him worked well on his daughter's indexed Shimano 7-speed setup, better than the original Shimano she had destroyed in a crash.
It indexed?
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Old 01-10-23, 04:08 PM
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Originally Posted by John E View Post
I am not surprised that this works well, since 14-34 was a very common Nishiki 5-speed freewheel during the 1970s, and the SunTour VGTs of the day handled it with aplomb.

What really surprised one of my coworkers was that the old VGT I gave him worked well on his daughter's indexed Shimano 7-speed setup, better than the original Shimano she had destroyed in a crash.
Before indexing- why would Suntour have put a barrel adjuster on a RD? Never made sense to me- but just knowing that it has actually worked for people is astonishing to me.
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Old 01-10-23, 04:14 PM
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Originally Posted by The Golden Boy View Post
Before indexing- why would Suntour have put a barrel adjuster on a RD? Never made sense to me- but just knowing that it has actually worked for people is astonishing to me.
Get rid of effect of cable stretch?
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Old 01-10-23, 04:19 PM
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Originally Posted by masi61 View Post
Huret Duopar with its unique 2 stage pulley cage could handle a spread like this I believe. I got rid of my eco-duopar since that upper pulley squealed for lack of lube and I could find no way to service it.
Warm up both, maybe in the sun or with a hair dryer, Duopar and lube of choice, maybe even Phil grease drizzled in and left to soak usually does the trick in these sort of cases.

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