Bottom bracket spindle length question

I've got a problem with a Trek Pilot 1.2 (2006).
The BB needs replacing and i'm not sure what spindle length I need. I've ordered a new BB removal tool which hasn't arrived yet so I can just look at the one that needs replacing.
The bike has a 68mm shell and a Bontrager Select triple chainset.
Does anyone know what size i need? Also how do I find this kind of info? Shimano is good for the tech docs but I can't find info on other makes.
Thanks
The BB needs replacing and i'm not sure what spindle length I need. I've ordered a new BB removal tool which hasn't arrived yet so I can just look at the one that needs replacing.
The bike has a 68mm shell and a Bontrager Select triple chainset.
Does anyone know what size i need? Also how do I find this kind of info? Shimano is good for the tech docs but I can't find info on other makes.
Thanks
Got to get up to get down
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It is possible that the ends are not symetrical, but if they are equal length then its simply 68 x D for your BB size (such as 68 x 113 for example).
See http://www.sheldonbrown.com/bbsize.html
http://www.sheldonbrown.com/bbsize.html
Sheldon lists 113mm for all Bontrager square taper versions and 118 for the ISIS triple.
Personally I would wait and get the old one out and measure just to be sure.
Pretty good price, this BB should last for years.
and a few of the much lighter UN71/72/73
I forgot to say, the BB is splined (ISIS).
I'll have a go at measuring it whilst in the shell. See if it agrees with old Sheldon Brown's listing.
it will be one of 3 length and most likely be 118mm for a tripple
see
http://www.bikeradar.com/forum/viewtopic.php?t=12737715
Parktools :?:SheldonBrown