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PostPosted: Fri Feb 08, 2013 9:47 pm 
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Joined: Mon Feb 04, 2013 10:04 pm
Posts: 54
Hello. I am building a hillclimb bike and would like a pointer towards an appropriate rear derailler.
Requirements/conditions of use as follows:
Will take 34T cog
Only needs to accomodate a 11 tooth difference (I am using a single front ring and the 4 top cogs of an 11-34 cassette)
Friction shift, so no particular indexing required.
Price is an issue- I like to be on the sweet spot of the grams/$ scale, not the AX Lightness end of things

Anything come to mind that would work

Also, I'm also looking for a single superlight caliper- barely has to work since max speed is 6 mph and it is only used once.


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PostPosted: Fri Feb 08, 2013 10:18 pm 
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Joined: Wed Oct 31, 2007 10:32 pm
Posts: 7412
Location: Los Angeles / Glendale, California
SRAM XX or Shimano XTR + tuning

or SRAM Red 2012+ Mid-cage (+ tuning), but I believe it only goes up to 32t.

Maybe cheapest solution: buy a used (pre-2012) SRAM Red RD ($100), tune, have fibrelyte or other provider create a longer cage so you can go up to 34t.

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PostPosted: Fri Feb 08, 2013 10:44 pm 
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Joined: Fri Feb 03, 2012 5:38 pm
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Location: Sacramento, CA
I snagged an old 9spd XTR RD for about $60 that fully accomodates an 11-34 cassette, though I use it for CX. It works with 9 & 10spd Shimano just fine.

Something like this.

Exact Model is SHIMANO XTR 952 which weighs in at about 210g.

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PostPosted: Fri Feb 08, 2013 10:48 pm 
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Joined: Mon Feb 04, 2013 10:04 pm
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prendrefeu wrote:
SRAM XX or Shimano XTR + tuning

or SRAM Red 2012+ Mid-cage (+ tuning), but I believe it only goes up to 32t.

Maybe cheapest solution: buy a used (pre-2012) SRAM Red RD ($100), tune, have fibrelyte or other provider create a longer cage so you can go up to 34t.


looking at SRAM XX it lists at 190 grams which seems pretty good. How much could I expect to take off by "tuning" it?


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PostPosted: Fri Feb 08, 2013 11:15 pm 
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Joined: Sun Jun 17, 2012 3:45 am
Posts: 100
XX derailluers are already fairly "tuned", iirc all of the limit bolts are alloy, and the cable clamp bolt is ti. You might be able to shave a few grams off the body of the der, but not without some heavy dremeling.

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