Chain slipping

[uncinquesei]

I've converted my old mountain bike to singlespeed and the chain slips under strain. I've used a new singlespeed chain, new (ie not worn) 18t cog on the rear, a chain tensioner set so there is as little slack as possible. As far as I can see, the chain is appropriate for the cog? So why is it not working? Grrrr....

[47p2]

Chain alignment incorrect. You might have to change the length of the bottom bracket

[uncinquesei]

Yes, chain line is spot on; because it's a converted shimano freehub I was able to use shims to get it all straight. It would be more accurate to say it jumps or skips I suppose. Cheers

[julianm]

Have you got a mix of 1/8" & 3/16" cog/chain/chainwheel? Might explain it - or a very stiff link which hasn`t loosened up yet?

[uncinquesei]

It's a 1/8" chain with singlespeed specific chain ring and rear cogs but it might be worth a try with a 3/32" chain, who knows? I'm intrigued by the idea of a stiff link - I'll investigate that tonight, ta.

[uncinquesei]

Thread reanimation.
Have been tinkering with singlespeed set up to try and get it sorted but still struggling...
I read that chain wrap may be an issue and the tensioner pushes down on the chain rather (ie decreases chain wrap) rather than pushing up. I modified the tensioner, I've bought a half link to try and reduce the amount of tensioning required and yet....
Got on it this morning, hoping for a first ride, and every pedal stroke is "skip / skip / skip / skip". It can't be a stiff link - most of the links are skipping, it can't be the massive torque I'm applying (literally got on bike outside front door, got off next door). Is there such a thing as a cog with "deep" teeth?
It's annoying but, as is often the case with these things, I'm rather enjoying the process.

[anonymous-user]

Mine was doing this after I changed the chain and cassette, pretty obviously my front ring was seriously worn when I held a new one up against the old one.

Did you say you put a new front ring on?

[Watchman]

I had this problem with a ss conversion. Needed more chain wrap. My tensioner still pushes outward but I just kept removing chain links until I had the barest minimum I could get away with and still get the wheel off. Works a treat now.

[IroningMan]

New chain on tired chainring - chain suck?

[uncinquesei]

New chainring, new chain, new cog. Chain tensioner pushing up to increase chain wrap. The only thing I can think of is a slightly larger cog to get close to the magic gear and have sufficient tension that skipping is impossible... Hmm.... Thanks all.

[upsidedownmark]

Ok, we're clutching at straws now, but are you sure both 'cogs' and the chain are all the same pitch?