What spoke key / nipple size?

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Hi, I want to buy a spoke key that will work on both my bikes (2009 Giant XTC 3 & 2008 Trek 1.5) but I don't know which one or which size for that matter. I don't know what size nipples/spoke they have, I'm presuming its a standard size (I'm guessing European) for both so what is the exact size spoke key I need to get. I had been looking at the following:

€3.21 http://www.probikekit.com/display.php?code=T0043
€7.16 http://www.chainreactioncycles.com/Models.aspx?ModelID=17510
€8.36 http://www.chainreactioncycles.com/Models.aspx?ModelID=12340
€5.97 http://www.chainreactioncycles.com/Models.aspx?ModelID=19098

seamus

Don't know how you can tell tbh.

I got one of these guys though:
http://www.wiggle.co.uk/p/Cycle/7/Park_Tools_Triple_Spoke_Key/-1210826560/

And it worked on two different sets of wheels, with two different nipple sizes for me.

Chips Lovell

Did you get any technical documents with the wheels? They'd often have that listed. If not, try the manufacturers website.

Aside from that, don't buy cheap spoke keys. I've ruined nipples with them. The four sided ones are best.

barrabus

i got one in my lbs with 6 different sizes on it ...