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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 03-14-14, 04:13 PM   #1
DKMcK 
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New Calfee "Convertible" tandem at NAHBS

Calfee was showing this tandem that converts to a single bike.


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Old 03-15-14, 01:38 PM   #2
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It took a little while to get my mind wrapped around this one. My first few reassemblies resulted in a loose screw or two
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Old 03-16-14, 04:19 AM   #3
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Wow, the braking system also flips between rim and disc brakes as you go from tandem to single bike. Now that's impressive!
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Old 03-16-14, 06:51 AM   #4
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It is two different bikes, check out the paint.
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Old 03-16-14, 07:12 AM   #5
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Wow, the braking system also flips between rim and disc brakes as you go from tandem to single bike. Now that's impressive!
The second photo is a different bike Calfee was displaying to show the "single" configuration.

The unfortunate thing is that the front section will not fit into a 26x26x8 S&S case for travel.

This was my favorite at the show.
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Old 03-16-14, 12:24 PM   #6
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The unfortunate thing is that the front section will not fit into a 26x26x8 S&S case for travel.

∆∆∆ I don't quite get that. The front section looks smaller than a normal coupled Calfee tandem like ours which fits into two cases.

What is it with the front section that makes the convertible too large to fit into a standard S&S case? Is the headtube too long?

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Old 03-16-14, 04:06 PM   #7
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∆∆∆ I don't quite get that. The front section looks smaller than a normal coupled Calfee tandem like ours which fits into two cases.

What is it with the front section that makes the convertible too large to fit into a standard S&S case? Is the headtube too long?
I did not measure it but the rep there said it took an oversize case and would not fit in the 26x26 case when I asked. I'm with you though, it looks like it would work.
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Old 03-17-14, 06:49 AM   #8
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Cool exercise in what's possible, but would anybody really want one? If you can afford this bike, you likely can afford a regular Calfee, and a nice single bike, niether of which will have the design compromises necessary for this convertible.

Only use I could see would travelling where you wanted the ability to ride a single and a tandem and didn't want to bring 2 bikes. That would appear to be a very limited application.
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Old 03-24-14, 11:36 AM   #9
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Calfee Convertible Tandem

I own one of the Calfee convertible tandems. The bike fits into one S&S 10 inch case (or 12 inch if you prefer) and one Tumi 30 inch suitcase. My existing coupled tandems (Litespeed and Lynskey Helix) both fit into 2 10 inch S&S cases.
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Old 03-24-14, 12:40 PM   #10
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I own one of the Calfee convertible tandems. The bike fits into one S&S 10 inch case (or 12 inch if you prefer) and one Tumi 30 inch suitcase. My existing coupled tandems (Litespeed and Lynskey Helix) both fit into 2 10 inch S&S cases.
I'd love to see a photo of the coupled Lynskey Helix tandem to understand how the couplers are integrated into the helix tubing which is anything but round.
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Old 03-26-14, 02:56 PM   #11
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I was giving this some thought and realized it could work out ok for the captain as a single, but typically not for the stoker to do the same due to frame size needs, ie: the front top tube length, stem, bar width and height, would all be wrong.

For the captain riding it as a single, the main issue I see is in using the stoker cranks for the single bike. If both captain & stoker use the same crank lengths, then great, no problem. However stoker cranks are often shorter than the setup needed by the captain. For example, I can ride with 172.5-175mm crankarms, while my stoker uses 170mm arms and no way I would want to use those... ie: I can't see myself climbing Mt. Ventoux using 170mm cranks! Awkward workarounds could be 1) pack an extra set of triple cranks, or 2) setup same-side drive and use a triple crankset (wider spacing than a double) for both riders - then move the captain's to the rear section for single riding. If you didn't care about the crankarm lengths, then you're good to go with all the components used on the tandem.


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Old 03-27-14, 03:18 PM   #12
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According to the report at RoadBikeAction.com, "This bike is valued at around $25,000".
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Old 03-28-14, 07:16 AM   #13
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According to the report at RoadBikeAction.com, "This bike is valued at around $25,000".
i think there's a little hyperbole in there. You can get a Dragonfly frame with couplers for $10,000, and a Triple convertible to a double for $12,000.

I would bet the cost of this frame would fall between the two. Built up with Rolf wheels, Di2, and lightning cranks that doesn't come up to $25,000, but then again its RBA.
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