Chain tools are a mystery to me

[Thomk]

So I would like to buy a quick link or 2 for my Giant Defy 2 2011 (9 spd compact) and Charge Mixer 2010 (Alfine 8 spd hub gears). Are there different types/sizes and how do I know which to get? Also need recommendations for a mobile chain tool to take on my commute:
This for the defy? - http://www.ebay.co.uk/itm/2-x-9-Spe...sure_cycling_bikeparts_SR&hash=item256a6a4252

 

[simon.r]

Chains come in different widths, so it's unlikley that your bikes have the same width chain. To be certain look at the chain(s) and see what make/model they are. This ebay page is as simple a guide as any. I may be over-cautious, but on singlespeed/hub geared bikes I carry a chain tool, 2 x spare links (similar to those on the linked ebay page) and a few spare links of suitable chain. My logic is that on a derailleur equipped bike you can get away with taking a few damaged links out and running a short chain, but you can't on a singlespeed. As I say, probably over-cautious, but a result of a long walk home, in very muddy conditions not long after I started riding a MTB

I like the Park Tool chaintool. Works very well IME.

 

[HovR]

Regarding getting quick links for your bikes: As simon.r said, chains come in different widths. The width of your chain depends on how many gears you have - For example a 10 speed has a narrower chain than a 7 speed to make room for the extra gears.

When buying quick links, just make sure it is described as being compatible/built for the number of gears your bike has.

EDIT: Just realized that you mentioned one of your bikes has a hub gear. This will probably mean your bike uses a single speed chain, in which case you would want a single speed quick link - Although it is not definite. If in doubt, bring the bike to an LBS and ask their opinion. They should have measuring equipment if you do not.