The perfect addition to your U-Lock arsenal, the Kryptonite KryptoFlex Cable provides 4 feet of additional locking space. With a double-looped braided steel construction, run the cable through your wheels and frame, then secure the cable to the shank of your U-Lock for a formidable system to defeat even the most determined thieves.
The KryptoFlex 1004 Cable measures 4 feet long by 10 mm diameter.
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Mfg PartNum: 210818
This cable is nicely flexible, of reasonable weight, and is robustly made. Within the security limitations of a cable, it is a quality product.
I use it in conjunction with a U-lock when the available locking points will not permit the shackle to be closed. I put the U-lock around the rear wheel within the rear triangle and use the cable to complete the reach. Less than ideal but sometimes necessary. At least the bike is immobilized.
It is easier to carry than many similar cables as it has a velcro strap, so I can attach it many different ways.
I use it in combination with a heavy u-lock, and it is long enough to secure one wheel or the other. Maybe in ideal situations it could grab both wheels. I used to have a 6' version of this cable, and I liked that better because I could always loop through both wheels and the u-lock.