Sms max length, for splitting msgs

"fred" <[email protected]>
Newsgroups gmane.comp.mobile.kannel.devel
Message-ID <000201c8059f$13019970$59e0110a@FRED42> 
The maximum length is conservatively set at 140chars in kannel.
Isn't worst case header length 11bytes ?
So really it could be set at 149length (the bleeding edge)
I really think it should be ok, 

have I missed anything?
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