So if you have raced in the bay area this season you have probably seen me drop my chain in the Single Speed category, at least once. I have done 13 races so far this season and have dropped it once in every single race except for 3 or 4. I got a new Rock Lobster a few races ago (kept same wheel) and thought this would fix my problems but dropped my chain last weekend at Coyote Point. Okay no problem just needs to be tighter. Raced it this Saturday at Surf City and dropped it a whole bunch of times then dropped out of the race (this was after checking the tension with a mech before). Two mechanics looked at my bike after and said they only things they can think of are alignment and my shitty acs freewheel.
I took it to a bike shop in Watsonville, paid 12 bucks to have a spacer put in between the hub and freewheel. Took the bike out and hammered up and down everything I could find unable to drop it. Went to race the next day and warmed up super hard making sure it wouldn't drop. Then on a super bumpy part at the end of the first lap of the race, it came off again! I put it back on and kept going for 4 more laps but then got a wood staple in my rear tire and flatter out.
Things I am going to try:
PC-890 Chain - 3/32 width and 8 speed so won't flex as much and will sit tighter on chain ring and cog. This is opposed to my current 1/8 Sram PC-1.
White Ind Trials 18t Freewheel - A new freewheel will hopefully just be better quality all around. More consistent tension with less tight spots than ACS.
Check chain alignment with calipers to make absolutely certain.
With those three things I cannot imagine there is anything else I could do. Would the rear hub for some reason have an effect? I am going to be building up a new tubular rear wheel soon and am wondering if I should go with a phil hub instead of white to see if for some reason that has an effect. Can't go Chris King because I have 120mm dropouts.