danallen

Are single cogs, such as 14 tooth Shimano road gear, generally findable, or do you have to buy a whole cassette. Only two of my gears are worn.

FBinNY 

In theory, the smaller, loose sprocket should be replaceable, however Shimano prefers selling cassettes to be single sprockets.

I've heard that some can be found, and maybe later post will give you a source. Otherwise, consider them hen's teeth.

dedhed

Probably going to have to go to Ebay.

​​​​​​https://www.ebay.com/itm/32456915490...BoC77YQAvD_BwE

alcjphil

The smaller the cog, if used most often, the faster it will wear out. If your 14 tooth cog is the smallest, you may be talking about a freewheel not a cassette. They are not the same thing

70sSanO

Good advice. I’ve used eBay for a number of individual cogs over the years for older freewheels and various era cassettes. It is more hit or miss these days, but they can be found.

John

Bill Kapaun

IF this is a 2x5 combo, a 5 speed rear will be a Free Wheel, not cassette.
Freewheel or Cassette?

https://www.performancebike.com/sunr...RoCKIEQAvD_BwE

DiabloScott

Exactly why the OP should convert to FG… then replacing one cog becomes trivial.

2_i 

Well, if you look at sources of individual Shimano cogs, there are surprisingly many vendors of these on AliExpress and some of those vendors venture onto Ebay and Amazon. Then, in parallel, there is this thread developing, that started with counterfeit Shimano pedals and evolved into one about counterfeit Shimano parts in general.

70sSanO

One thing I will add, make sure the cog is designed for the tooth gap.

Shimano has designed cogs for a 1t change and 2t(+) gap. If the cassette is 12t-14t you’ll want more than one ramp on the cog.

There will be a slight hesitation using a 1t gap cog in a 2t+ application.

John

3alarmer 

.
...generally , people just buy and replace the whole cassette cluster, as well as the chain, at roughly the same time.

CliffordK

You can find parts diagrams for most Shimano cassettes. Search Google with the part number followed by PDF.

That will give you a part number which may help with your search. Unfortunately not a lot of US companies sell individual sprockets online.

EBAY or Amazon as mentioned above may help your search.

If it is a freewheel, it will be hard to find individual sprockets.
For a cassette, if the desired sprocket is part of a common carrier, or riveted group of sprockets, then Shimano won't sell an identical replacement single sprocket. But a 3rd party brand might work.

But, if it is loose sprocket, then you should be able to find the part number.

First position and second position sprockets usually have a built in spacer. Third position and greater sprockets are generally flat. Anyway, that built in spacer will be "speed" specific, and a difference to look for.

For flat sprockets, 10s and 11s will both be 1.6mm, and may be similar enough to use.

Shift gates could be slightly different for non-exact matches.

danallen

Nice work finding those singleton gears. This is going to help me out, thank you!

danallen

QUOTE=alcjphil;22672880]The smaller the cog, if used most often, the faster it will wear out. If your 14 tooth cog is the smallest, you may be talking about a freewheel not a cassette. They are not the same thing[/QUOTE]







Three years ago, I got this cassette new, with a new Shimano cn-6701 10 speed chain. Recently, the chain broke at two points. Then I lost a section of the chain, so I had to get a new chain.

The new chain skips on the two gears I replaced. Replacing those two cogs

I didn't know single gears are available. So, instead, at my LHS, picked up a whole Shimano 10 speed cassette. Shimano exquisite manufacturing, except it's heavier than I am accustomed to


Smallest cog on my cassette is 11t. The cassette is Ultegra 11-28. I cannot remember what att the tooth counts are, but the small gears are 11, 12, 13, 14, 15, ... After that I don't remember.


​​​​​​​

danallen

10-speed freehub, 2009 Ultegra, 6600 series

tFUnK

Over the years I've found mine from a number of different sources. Most recently, I've gone the AliExpress route. The shifting may not be as precise as a direct replacement from Shimano or SRAM but I've not been bothered by it - I think the shifting is fine. My reason for finding these one-off cogs is not for wear replacement, but to get a different gear spread. I don't like the 15-17-19 jumps, am trying out 15-16-18 currently.

danallen

What does it mean to convert to FG Fixed gear?

danallen

I have never seen nor heard of a 2x5

70sSanO

Fifty plus years ago road bikes were called 10 speeds. A freewheel with 5 cogs and 2 chainrings equaled 10 gear combinations. A 10 speed was a road bike.

Forty plus years ago they went 12 speeds, and 35, or so, years ago road bikes went to 14 speeds; although the higher speed reference never became synonymous with being a road bike.

With an increasing number of speeds, triples, mtbs, hybrids, the 10 speeds moniker for road bikes died.

To accurately describe a drivetrain the chainring(s) X freewheel/cassette identifier has been adopted. Hence 3x9, 3x10…, 2x7, 2x8…, and 1x10, 1x11… designators.

When you talk 10 speed road bike, some people associate that with the traditional 10 speed (2x5). This thread went off track because unless you are running a single chainring, which most would identify as a 1x10, you don’t have a 10 speed road bike. You are running a 10 speed cassette.

That said, cassette cog count has become an identifier of sorts, i.e., running 10 speed Ultegra, or 11 speed 105.

John

DiabloScott

A FG is a single-speed (one chainring, one cog), except the wheel and crank are FIXED together - ie no coasting - . Lots of different reasons why folks like FG riding, but it's a fun way to modify an older bike to a new purpose. It solves the problem of matching freewheels to hubs and shifters.

Bill Kapaun

Maybe if you paid attention?