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-   -   New Calfee "Convertible" tandem at NAHBS (http://www.bikeforums.net/tandem-cycling/938256-new-calfee-convertible-tandem-nahbs.html)

DKMcK 03-14-14 04:13 PM

New Calfee "Convertible" tandem at NAHBS
 
2 Attachment(s)
Calfee was showing this tandem that converts to a single bike.

http://bikeforums.net/attachment.php...hmentid=368795
http://bikeforums.net/attachment.php...hmentid=368793

twocicle 03-15-14 01:38 PM

It took a little while to get my mind wrapped around this one. My first few reassemblies resulted in a loose screw or two ;)

Chris_W 03-16-14 04:19 AM

Wow, the braking system also flips between rim and disc brakes as you go from tandem to single bike. Now that's impressive!

DubT 03-16-14 06:51 AM

It is two different bikes, check out the paint.

DKMcK 03-16-14 07:12 AM

Quote:

Originally Posted by Chris_W (Post 16581660)
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.

twocicle 03-16-14 12:24 PM

Quote:

Originally Posted by DKMcK (Post 16581838)
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?

DKMcK 03-16-14 04:06 PM

Quote:

Originally Posted by twocicle (Post 16582617)
∆∆∆ 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.

merlinextraligh 03-17-14 06:49 AM

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.

davekeon 03-24-14 11:36 AM

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.

Krenovian 03-24-14 12:40 PM

Quote:

Originally Posted by davekeon (Post 16606628)
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.

twocicle 03-26-14 02:56 PM

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.

https://scontent-a-sea.xx.fbcdn.net/...38287490_o.jpg

twocicle 03-27-14 03:18 PM

According to the report at RoadBikeAction.com, "This bike is valued at around $25,000".

merlinextraligh 03-28-14 07:16 AM

Quote:

Originally Posted by twocicle (Post 16617551)
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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