Did this trip in Dec 01 on 4 wheels - we took the "standart" route from Djanet - Mt. Tiska - Erg Admer - Afellahlah - H. Tiririne - Oued Honjad - Oued Takalous - Oued Tadant - Oued Tibeleghtaghine - TAM.
All together about 700 km , very easy terrain to drive for 4 as well as 2 wheel !
The part from GARA DEBANET to TAM ( 3 third )is NOT recommended in case of several long parts of unbelievable dusty ways through "powder flour" - very unpleasant in cars, so I think much more on 2 wheels !
If I would do this again , I would bend at GARA DEBANET to direction south to "H. In EBEGGUI" and than to north - disadvantage : 150km more!
If you are interested I can mail you the whole track in TTQV2.5 format(*.qu2)
Carpe Diem !