Cyclo Chain Wear Indicator

Keeping the chain on your bike in good condition is essential to keeping
everything running smoothly. Over time, the chain on your bike will
 stretch slightly and this can cause wear in the drivetrain and can be a
precursor to an annoying breakage out on the trail. 
A typical chain only needs to stretch as little as 0.75% in order to
start causing problems, so it's pretty much impossible to know the
 condition just by looking at it. That's where a chain wear tool comes 
in. It's a precision-made measuring device which allows you to quickly
and easily assess the condition of your chain, taking the guesswork out
of when to replace it.

With an RRP of £5.99, it's not an expensive bit of kit and it's the sort
of thing that everyone should keep in their tool kit.  The money that
 can be saved with a bit of preventative maintenance can run into 
hundreds of pounds.

 Carrying the 'Cyclo' brand, you'd expect this to be well made, and it 
is. It's small and light enough not to be a hassle to use, even on
'busy' bike frames, and still has a good, solid feel to it. The tool
comes in a fairly typical retail package bearing the Cyclo branding. It's a shame that there's no recycling information on the plastic as
some local authorities are very strict on the types of plastic they will 
take, but that's a small criticism.

Using the tool is very straightforward, with the instructions only
confirming what is (hopefully) fairly obvious;  Rest the u-shape on one
of the chain rollers and lower the 'spiked' end onto the chain. If the
 tool drops right into the chain, then it's time to think about replacing 

One thing that I particularly like about the shape of the tool is 
the curved ends. With some chain tools, the end that drops into the 
chain is squared off; this means that it's very much a 'yes' or 'no' 
result. The Cyclo tool will give you a more progressive result,
 allowing you to monitor any increase in wear over time, maximising the
life of your chain.

What's great: At under £6, it can save you a fortune by preventing drivetrain wear
 - Gives you progressive measurements of your chain wear 
- Small, light and tough
- All your mates will want to borrow it, and you'll look like a cool
bike mechanic 
- You don't need to be a cool bike mechanic to use it, it's a simple
tool for any bike owner

Could do better:
 Be clearer about the package recycling.

Overall:  9/10