Singlespeed & Fixed Gear - Chain or Hub slipping

so i have been riding a fixed gear conversion for the past 8 or so months and in the last couple of weeks i have issues with my chain or hub slipping. i can't recreate it unless i am trying to skid or push up a really steep hill. my commute is relatively hilly and it always when descending or ascending those hills. so far i have replaced the chain and the chainring and the guys at the shop seem to think that my chain tension is fine as well as my cog.

has anyone heard of iro hubs stripping that would cause this? because i can't imagine the chain doing it after all the stuff i have changed.

thanks

it could be your lockring. if you dont tighten your cog enough first time and then it gets naturally tightened by you pedalling then because the lockring hasn't been tightened in turn there is a small amount of 'give' between the cog and lockring ie the cog can slip slightly either way.

they checked that at the shop and i left it out of my original post. thanks a lot though. i may get that checked again.

loose chainring bolts

try and recreate it at home. if it is a loose lockring, you should be able to reproduce it fairly easily in a controlled setting.

my new iro premier hubs did that with the soma cog i had on, but doesnt do it with the iro cog. miniscule width difference i guess between the two that caused it to slip a bit. so maybe try a different cog, maybe an iro cog and lockring

It's the hub. I highly, highly doubt it's your chain slipping unless your drivetrain was *very* worn and *very* under tensioned.

that thing happened to me also on my new capo. On heavy movements (like up a hill or starting to sprint, or doing a skid) sometime i would get a *pop* and my crank would shoot forward or backward 1/2 or 1/3 turn. It hasnt done it in a while tho.

I had a similar sensation of something in the drivetrain slightly "slipping" or "giving" when serious force is being applied (ie: mashing up a steep incline, or while applying reverse pedal pressure when stopping or skidding). Turns out what I was feeling was flex from my ****ty fsa vero track cranks.after I threw on some 75s I didn't notice it anymore. But I also switched out a 46 chainring to a 44, so maybe there isn't as much force being applied? Not sure how that works or if this is any help.. regardless, that's my $0.02.

thanks for the input. i rode it last night trying to recreate what was going on and nothing happened until i let my guard down. sprinting out from a green light up a hill i got pitched again. so i took it into the shop and i am going to let them handle it.