Originally Posted by BikeWise1
This is only true because most people don't pay attention to details. There are two different 10 speed ampules. The 7800 and the 7801. They are not compatible. Using the wrong one will cause the chain to fail.
I recently bought shimano 10 speed pins from PBK. When checking out their supersize picture of the product, prior to order, I specifically looked for CN-6600 compatibility. Right to go, so I ordered. Well actually NO, when they arrived they were CN-7800 pins which do not have the 3 groves on the brake off end.
After emailing them they have actually credited my CC & I still have the pins. Seemed silly as they did not even sell CN-7800 chains.
Edit:- Just checked their site & now they currently do not offer any 10 S shimano pins.