They are selling them on ebay and claiming they gave been used in Europe for years and are great chains. Wanted to see if anyone had any first hand experience. I dont race my bike but do ride spiritedly on the street. Here is alink

http://cgi.ebay.com/ebaymotors/ZX-12-ZX-14-ZX12-ZX14-Swingarm-Extension-Package-CYC-_W0QQcmdZViewItemQQhashZitem27bc4837e9QQitemZ170662574057QQptZMotorcyclesQ5fPartsQ5fAccessories#ht_3818wt_941

* Last updated by: cbibb on 7/3/2011 @ 2:06 PM *

never heard of it. I checked with the drag racing set at bikeland and the only two recommended were EK ZZZ or DID chains.