Tapered headset bearing replacement, generic sizes ?

Gents,
I've got a Giant XTC 29er with a tapered headset that's a bit rumbly, however don't have the sizes of bearings etc in advance to get them odrered.
Are they a generic size etc for tapered headsets ?
http://www.giant-bicycles.com/en-gb/bik ... 342/49895/
http://www.bikeradar.com/gear/category/ ... r-11-40863
I've got a Giant XTC 29er with a tapered headset that's a bit rumbly, however don't have the sizes of bearings etc in advance to get them odrered.
Are they a generic size etc for tapered headsets ?
http://www.giant-bicycles.com/en-gb/bik ... 342/49895/
http://www.bikeradar.com/gear/category/ ... r-11-40863
Salsa Spearfish 29er
http://superdukeforum.forumatic.com/index.php
http://superdukeforum.forumatic.com/index.php
0
Posts
If it complies to the headset standards the sizes can be found on the headset standards pages and Parktools.
Parktools :?:SheldonBrown
Dropped bike at my mates for Morzine next week... he bought the bits and fitted when i was at home
http://superdukeforum.forumatic.com/index.php