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Will Suntour GPX RD index with standard Shimano SIS shifters and Hyperglide cassette?

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Will Suntour GPX RD index with standard Shimano SIS shifters and Hyperglide cassette?

Old 05-01-11, 06:07 PM
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RFC
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Will Suntour GPX RD index with standard Shimano SIS shifters and Hyperglide cassette?

Thats about as succinctly I can ask it.

Want to use a GPX RD with 9-speed Shimano bar ends and a 9-speed Hyperglide cassette.

I know that DA 7400 RDs will not integrate with standard Shimano 8 speed and below because of the design of the RD and the amount of cable pulled.

What about GPX?

Thanks

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Old 05-01-11, 06:16 PM
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it should. normally if the shifter and cassette/freewheel, match the derailleur can be a different brand provided it is a index derailleur. I ran Suntour 7spd barcons and freewheel with a 600 I8 derailleur for sometime.
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Old 05-01-11, 06:32 PM
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If the bar ends are Dura Ace, I say no. The warning label says it all.

If the bar ends are not Dura Ace, I say yes. GPX RD with 9-sp Sora's.

Last edited by RobbieTunes; 05-01-11 at 06:39 PM.
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Old 05-01-11, 07:55 PM
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Originally Posted by RobbieTunes View Post
If the bar ends are Dura Ace, I say no. The warning label says it all.

If the bar ends are not Dura Ace, I say yes. GPX RD with 9-sp Sora's.
OK, Robbie, help me to understand. I thought all Shimano, including DA, were standard and compatible 9 speed on.
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Old 05-01-11, 08:45 PM
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I will say no, sort of. The problem with Shimano 7400 series Dura Ace compared to everything else Shimano is the cable pull ratio is different. So one click of an indexed shifter will pull a 7400 derailleur and another Shimano derailleur a different amount. Suntour also uses a different cable pull ratio. But, often you can get weird combos to work okay to even pretty well. Standard Shimano is 2:1 and 7400 Dura Ace and Suntour use slightly smaller ratio (don't know the numbers).

The 9 speed Shimano bar ends (model:SL-BS77) work perfect with standard Shimano rear derailleurs. I have two bikes with them, one has a Deore XT rear and the other has an Ultegra.

Last edited by redxj; 05-01-11 at 08:50 PM.
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Old 05-01-11, 09:04 PM
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Thanks. This is just what I wanted to know.
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Old 05-01-11, 09:25 PM
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You can also hub-bub to mix with DA.
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Old 05-01-11, 09:50 PM
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Originally Posted by Puget Pounder View Post
You can also hub-bub to mix with DA.
? I don't understand.
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Old 05-01-11, 10:04 PM
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I wouldn't worry about it. If your stuff is not DA, then your GPX should work just fine.
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Old 05-01-11, 10:04 PM
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Hubbub
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Old 05-01-11, 10:07 PM
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These are helpful:

https://www.ctc.org.uk/desktopdefault.aspx?tabid=3946
https://www.sheldonbrown.com/dura-ace.html
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Old 05-02-11, 06:07 AM
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Yes it should work with some fine tuning according to what I have read, Shimano 8 & 9 speed cassette spacing are close to to what Suntour freewheel/cassette spacing was but not exact. I was just researching this myself as I wanted to use Suntour derailleurs with a Shimano cassette and came across a few older threads here that members had no problems using Suntour Derailleurs with 8 speed and up Shimano Cassettes. The real problem is 7 speed and under the spacing is not close enough for this to work.

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Old 05-03-11, 12:41 AM
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Thanks for all of your help.

The only reason I am pushing on the GPS RD is because I am trying to maintain as much stock as possible on the RB-1, which is going to be a bit of a Frankenbike anyway (CF fork, 9-speed, bar ends, different wheels). I could always just skip the issue and use a Tricolor or Ultegra RD.
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Old 05-03-11, 12:57 AM
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Originally Posted by RFC View Post
Thanks for all of your help.

The only reason I am pushing on the GPS RD is because I am trying to maintain as much stock as possible on the RB-1, which is going to be a bit of a Frankenbike anyway (CF fork, 9-speed, bar ends, different wheels). I could always just skip the issue and use a Tricolor or Ultegra RD.
The beauty of the RBs were that they were kind of frankenbikes anyways. Part of the reason they were so great!
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Old 05-03-11, 05:24 AM
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Originally Posted by RFC View Post
Thanks for all of your help.

The only reason I am pushing on the GPS RD is because I am trying to maintain as much stock as possible on the RB-1, which is going to be a bit of a Frankenbike anyway (CF fork, 9-speed, bar ends, different wheels). I could always just skip the issue and use a Tricolor or Ultegra RD.
Well then I would use the shifters that match the RD if at all possible, Suntour and Shimano mixing can be a real pain to dial in. When I build a bike I try to keep the drive components matching as best I can just to avoid problems.

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