Running a 1/8 chain on 3/32 sprocket & chainring?

Id check out these:
KMC K810SL, and the one I'm using on the track... can't remember what it's called, but it's a KMC something SL, and looks to be a little less heavy duty than the K810SL. :)

Muchos Thanks yous.
I'm almost sold to the idea of running a 3/32, kmc... Using the 1/8 chain might be
to much rattling around the chainring.

I run an Izumi NP 3/32 chain and it's silent, weighs nothing, and gives off a gentle scent of lavender as you ride.

I'm after a new sproket for my fixie, for climbing hills. Always bought 1/8" sprockets in the past 'cos its the "proper" size. But I've a 1950 road bike with gears - but on the other side of the hub is a fixed threading. But I'm guessing it'd need a 3/32" sprocket to ride it fixed. So - if I buy a new 3/32" sprocket and will it work okay on my modern fixie? Then could I swap it onto my vintage bike for a bit of fixed fun??

1/8th chain will fit over 3/32 chainrings and cogs.
3/32 chain will not fit over 1/8th chainrings or cogs.
Find out what width chainring you have (vernier or dropping existing piece of chain on it) before making your purchase.

1/8th chain will fit over 3/32 chainrings and cogs.

That - put much more succinctly - is what I wanted to know - thanks!

OK, so I have a Shimano Ultegra 42T 130 BCD road chainring sitting here. I've not bought my chain or track sprocket.

Can I get a nice setup with this? If so, what specifically do I need to look out for (apart from being 3/32) when buying the chain and sprocket?

Cheers

The number of teeth on your cog is important!

Sheldon Brown's website. Make a cuppa, give it a good read to learn about gear ratios and considerations.

Make sure the water temperature is correct. 180 degrees Fahrenheit for green tea, 190 degrees for Oolong tea, 200 degrees for black tea. You'll have to experiment with steep time as this is subjective.

Also consider your biscuit choice carefully. Meditate on it.

+1

very important consideration.

Fahrenheit? That tea will be too old. Will taste shit.

Re-stock, and boil again in celsius.

I also use a Shimano 42T road chainring, in my case, a 1976 Dura-Ace one, with a 1/8" track chain and 18T sprocket to give a gear of 63" which suits the undulating terrain where I live. If you're in London, then try a 16T.

Milk and two sugars please.

Thanks! That was exactly the answer I was looking for. I just wanted to know if the chainring I have was up to the job.

It is. It is ok to mix a 3/32 chainring with a 1/8 chain and sprocket but not the other way round.

since i replaced the worn 3/32 cog with a 1/8 (all I had) and 1/8 chain, now I get the chain falling off once every few days/big bumps. chain tension still good though

is this to be expected? wanted to check before i fork out for new cog and chain

cheers for any advice!

yep, get the right size.

if your chainline is good and chain tension good it can't come off.
only my thoughts -

I've mixed & matched before with no problems - is your chainring ok?

I've been running an 1/8" chain with a 21tooth 1/8" rear sprocket and a 3/32" TA 52 tooth alloy ring for some years, and I replaced the chain yesterday. I reckon about 30,000 miles from that old chain. Can't complain about that really, as I think it was lightly used when Ioriginally fitted it. Never any jumping off probllem, just spend some time making sure the chain is running straight.

right, cheers. all good thoughts. so i have good tension and chainwheel is less than year old, little worn. so odd the chain is coming off still. chainline is good too.
arse

Check that your chain ring is still straight. Check that all the teeth on it and the sprocket are ok; if one is even slightly bent it can take the chain off. Check the chain for any stiff links.

I've been running an 1/8" chain with a 21tooth 1/8" rear sprocket and a 3/32" TA 52 tooth alloy ring for some years, and I replaced the chain yesterday. I reckon about 30,000 miles from that old chain. Can't complain about that really, as I think it was lightly used when Ioriginally fitted it. Never any jumping off probllem, just spend some time making sure the chain is running straight.

30k miles? wow.
never had more than 1k miles out of an MTB chain (I run 3 in rotation). Yet to find out how long road chains (7/8spd) last.

I've probably done about 2000 miles on the current cheap and cheerful KMC chain on my fixed, starting to think I should replace it....

A 6 year old thread with great info, who'd have thought it.

Great info indeed, just saved me from having to make a few hard bike decisions.