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Old 06-14-12, 08:39 AM   #1
logan70389
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Double to Triple Converison Compatibility

Hey,
I just bought a Serrota Ti double crank Ultegra bike and am converting it to a triple crank Ultegra. It currently has 6600 series components. It seems the 6700 components are easier to find and cheaper in some cases. I've looked at the compatibly charts and read the forums and it seems that the following combination is valid. Please let me know if you see any problem in this setup or if you see where I am changing something that does not require changing:

shifters - 6600 (new triple shifter required on left)
crank - 6700 triple (new)
front derailer - 6700 (new)
rear derailer - 6700 long (new)
bottom bracket - 6600 (existing)
chain - SRAM 1051 (new)
cassette - 6600 (existing)
brakes - 6600 (existing)

Thanks in advance
Tom
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Old 06-14-12, 10:50 AM   #2
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The only problem I see is if you install the new chain on a cassette with appreciable miles. You are very likely to have skipping problems.
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Old 06-14-12, 10:58 AM   #3
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Like above, I'd start out anew, with a fresh cassette and chain.
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Old 06-14-12, 03:11 PM   #4
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Thanks for the quick responses!! Is replacing the cassette more of a good practice - or is it common to see a skipping problem? I've been riding for about 20 years - through 3 or 4 bicycles and I've replaced the just the chain a couple times here and there by itself. I've not seen this problem before - although I've heard this. My riding buddy had his chain skipping on climbs not too long ago. After some observation, we determined it was in his chain rings. We replaced his chain and all the chain rings (3) and he has been problem free since then. I have nothing against changing the cassette - I just want it to be worth the dollars.
Thanks
Tom
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Old 06-14-12, 03:18 PM   #5
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if you have gone thru a couple chains already, time is probably right
to replace the cassette ..
just, normal, as the wear on teeth has happened..

Rohloff, the chain Company has a service reference tool
to check that wear, but that may just be more expense,
telling you to spend the money for the new cassette anyhow.

many Bike shops would have one of those wear test tools.

Last edited by fietsbob; 06-14-12 at 03:23 PM.
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Old 06-14-12, 03:50 PM   #6
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Thanks - I'll do the measurement
Tom
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Old 06-14-12, 08:34 PM   #7
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The front derailleur needs to be a triple.
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Old 06-15-12, 08:42 AM   #8
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yep - I ordered a triple for the FD
Thanks
Tom
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Old 06-15-12, 09:09 AM   #9
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Wouldn't a cheaper & easier as you need fewer parts option have been to get a GS rear mech, 5700 or 6700 & a SRAM 11-32 cassette & a new chain?

This would give you the same or close as ratios as most triple setups with the WiFLi type rear end, and be a whole lot cheaper that your proposed option!
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Old 06-15-12, 04:47 PM   #10
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Quote:
Originally Posted by jimc101 View Post
Wouldn't a cheaper & easier as you need fewer parts option have been to get a GS rear mech, 5700 or 6700 & a SRAM 11-32 cassette & a new chain?

This would give you the same or close as ratios as most triple setups with the WiFLi type rear end, and be a whole lot cheaper that your proposed option!
I'm very interested in this option-- so if anybody has experience with a large SRAM cassette with a similar Shimano set up I hope they'll chime in.

But I gotta ask... What is WiFLi?

--Tom in SoCal
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Old 06-15-12, 07:00 PM   #11
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WiFLi is a SRAM trademark http://www.sram.com/sram/road/technologies/wifli_tm in very simple terms it's using the larger ratio cassette to replace the triple crank.

I've been playing with this, using a PG1050 11-32 & Shimano 105 (5700) GS RD and did a very hilly ride yesterday, and it was nice to have the 30 / 32 rather than the 27 max I previously had with a 12-27t.
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Old 06-15-12, 08:03 PM   #12
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I thought that the GS rear derailleur will have the same spec. for cassette large sprocket capacity as the non-GS road derailleur. The longer cage is only intended to have greater take up capacity for the triple chain ring. I'm not saying it won't work with the 32t sprocket, but just that it is no more likely than a regular short cage rear derailleur.

Please correct me if I'm wrong.

I put a Deore XT RD on my wife's Tiagara 9 speed setup and it works great with a 34t cassette.
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Old 06-16-12, 06:27 PM   #13
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Very interesting proposal. I should have posted before I purchased a large chunk of the components!! That is a great link
Tom
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