I've recently had a couple problems with 6 speed rear set ups not shifting well that has me questioning the proper chain width for them.
One is my Bridgestone 400 that has Suntour Accushift with barcons. I used to run a Sram PC58 on it with no problems. The chain is worn and when I went to replace my LBS said to use a Sram 830 or 850 chain. He said 7/8 speed but the Sram website says 8/9 speed. The narrower chain does not work well and I resorted to an old wider one to avoid endless chatter in the rear because it just wouldn't adjust.
My other issue is with a 6 speed friction Zebrakenko with a SuperMaxy crank. The chain tends to hang between the large and small chain rings and slips. I'm assuming something wider will work better.
Bottom line - what do you folks use as replacement chains for 6 speed bikes? I've tried Nashbar in the past but their master links are a joke and don't hold.
Any suggestions for a good source or brand/model?