They didn't stop making it, they just stopped calling it the Los Dos after 1997. It was the generic name for 26" all terrain tandems sold by Cannondale. There was an entry level model below called the MT900 Los Dos, the mid-level MT1000 Los Dos and the high-end MT3000 -- we had a '98 MT3000/great bike.
Anyway, I'd give it a try as-is with the 48x11 to see if you "need" to go larger before shelling out the coin. You probably will and if so give Larry Black of Mt. Airey Cycles a call or drop him an Email (Email: firstname.lastname@example.org
or go to their Web site: www.bike123.com
) as he might be able to steer you to some oversized MTB chain rings that are larger than 48t to extend your current crank capacity. You can also up the ante with a 110mm or 130mm crankset that will take the larger drive rings to give you a 700c-like top end using a 55t or 56t big ring.
However, you're stuck with the 26" wheels. But, don't dismay. They make some great 26" road slicks and you'll be hard pressed to know the difference in wheel size from a 700c bike once you're moving.
Again, Larry is perhaps the best tandem guy to talk to about 26" bikes. He is the proud owner of a bunch of 26" tandems including the only 26" all-carbon Calfee Tetra Tandem of about 100 or so Tetra Tandems in existence.
Last edited by TandemGeek; 10-10-07 at 07:58 AM.