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Tandem Cycling A bicycle built for two. Want to find out more about this wonderful world of tandems? Check out this forum to talk with other tandem enthusiasts. Captains and stokers welcome!

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Old 01-21-09, 04:54 AM   #1
evan&sue
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Cannondale RT2

Well we finally upgraded from our Raleigh 26" to a Cannondale RT2! A big investment in AUD but one we are mostly happy with given the weight difference alone.

A couple of concerns:
1) The bike came with Truvativ Crankset and should have been Gossamer. We are still waiting for the replacement! Perhaps this relates to number 3 below???
2) We melted the fancy brake cable set up (linear) on the rear discs and had to have it replaced with standard cable after our first 4km downhill road run. We melted the outer on to the inner!
3) We can't seem to get the rear cassette settled. One click does not change but seems to leave the chain in limbo. It's very noisy. A second click seems to change it although uphill under pressure, after more than 5 full rotations, it skips again. No matter how many adjustments, it doesn't seem to be right.

Tandems are few and far between in Australia so we don't have many experts. We are very lucky to have our LBS helping us along with the expertise of a pro rider and Australian champion. However, we need some tandem specific knowledge.

Tandemgeek or Zona??? Any advice please.
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Old 01-21-09, 07:19 AM   #2
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For #3 check your derailleur hanger alignment. It requires a special tool but the process is identical to a single bike.
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Old 01-21-09, 11:07 AM   #3
the desert fox
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re issue #2, how did the cables melt? could it have touch the disc itself?
i imagined that you would melt the red cap on the actuating arm first before the heat creeps up the cable housing.
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Old 01-21-09, 03:38 PM   #4
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Given that the tandem is not new (?), look for frayed cables inside the STI shifter. That can cause the problem you describe. The constant flexing from straight to wrapped around the shift drum, causes fraying right at the end of the lifetime of the cable. Tight or twisted chain links can cause some of the problems you describe. Also look for a loose cassette lockring.

People will laugh at me for saying this, but the best way to set the indexing for the shifters, even on a Cannondale, is with the bike fully loaded and at operating temperature. You do it while you are riding. The long bike bows a little under weight and distorts your perfect static, unloaded index setting. Also, the steel cable and the aluminum frame expand and contract at diffferent rates with varying temperature. Yes, I have two aluminum tandems, including a Cannondale. The problems you describe are greater than would be expected owing to loading and temperature changes.
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Old 01-21-09, 04:01 PM   #5
evan&sue
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Yes, the tandem is brand new. It also came with an Ultegra rear derailleur which should be XT we believe and this may be the biggest problem with the rear cassette. We'll try the suggestion for the hanger alignment and if this doesn't work, we might suggest Cannondale supply the XT rear derailleur so we can try that.

As for the melting of the brake cable, the heat transferred from the disc down into the cable and melted the rubber casing causing the brakes to lock on. The result was a 4km climb at 10% with the brakes on! We've reverted to standard brake cable and haven't had any problems.
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Old 01-21-09, 04:06 PM   #6
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It usually takes me a couple of rides for a new shifter cable to get seated in before it settles down and shifts correctly. During those first rides I'm always taking slack out of the cable so it shifts properly. Could this be the problem?
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Old 01-21-09, 05:04 PM   #7
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I wonder if this may have something to do with it.

Sorry! its the IRD 11-34 cassette question again

Seems that Cannondale may have spec'd the IRD cassette.

For 2009 http://www.cannondale.com/bikes/09/cusa/model-8RT2.html

For 2008 http://www.cannondale.com/bikes/08/cusa/model-8RT2.html

Just another option to possibly check.

PK
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Old 01-21-09, 08:37 PM   #8
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hi evan&sue,
i am also thinking of getting the RT2 but i haven't seen a photo except for what appears to be the marketing photo of the bike online. i hope you can post some photos. i've been doing some reading here for awhile now but not much is written about the 2009 Cannondale tandem line-up. thanks in advance.
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Old 01-22-09, 05:26 AM   #9
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What is the cassette on the rear?

On our Trek T2000 the bike shop replaced the XT with an Ultegra long arm derailleur after an accident (which is really only a mid length derailleur).

This works ok for us becuase I run with a 12-27 cassette anyway (so far have not had to walk any hills).

I believe if your cassette has sprockets larger than 29, you will probably need the XT/XTR long arm derailleur which is designed for the larger range.

As for disk brakes, I am personally glad Trek still use V-Brakes and Calipers. We put an Avid road disk on as a 3rd brake and burnt it out after 1 month. After that, I can't be bothered putting on another disk (although someone has given me a full metal mechanical disk with dual pivot pads to try).

Last edited by thebearnz; 01-22-09 at 01:39 PM.
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Old 01-22-09, 07:10 AM   #10
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Truvativ makes the gossamer crankset.

--jim
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Old 01-22-09, 11:52 AM   #11
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Would remove the cables/housing and look for burr on cable housing or fraying/kink in cable. Then run cables through a block of canning wax to lubricate and then install.
Look for issues with rear derailleur: proper alignment and jockey rollers/teeth. Also check for a tight link on your drivechain.
Never been over-enthused with discs and have no expertise there.
Takes a while to get a new bike settled in; enjoy riding TWOgether down under!
Pedal on!
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Old 01-22-09, 08:21 PM   #12
PMK
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Quote:
Originally Posted by Jim Bonnet View Post
Truvativ makes the gossamer crankset.

--jim

FSA should be making the Gossamer, while Truvative makes Elita.

http://road.fullspeedahead.com/fly.a...layout=product

Hope you get it all dialed in.

PK
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Old 01-24-09, 02:38 AM   #13
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For an 11/32 rear cassette you will need a long reach rear deraiiler such as XT and I do not think that Ultegra is. The crank set change is not really a problem and I would much rather have a Truvativ (Made by Sram) than an FSA crank anytime- but that is only my experience. I have had two FSA cranksets cause problems and use the Elita on the road bike with no problem.

I have never really understood why Cannondale spec disc brakes on the road bike but there is not a problem with them-normally.

Hope you get the teething problems sorted so you can get out and enjoy the Tandem. May take a bit of sorting- but get the shop to help you there.
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Old 01-24-09, 12:02 PM   #14
Jim Bonnet
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Quote:
Originally Posted by PMK View Post
FSA should be making the Gossamer, while Truvative makes Elita.

http://road.fullspeedahead.com/fly.a...layout=product

Hope you get it all dialed in.

PK
doh! you are right..
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Old 01-26-09, 04:44 AM   #15
evan&sue
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We have had the rear derailleur realigned and it is much better - not perfect but definitely an improvement. We've also adjusted the cables.

The comments about the rear derailleur are interesting as we are running an 11-32 with Ultegra but it should be XT. We are wondering if we will continue to have issues because of this. We will do some more investigation.

Thanks everyone.
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