I'd be interested in hearing peoples experiences with this. Opinions vary greatly
Basically, with the all travel on the 09 forks:
1 spacer = 100mm travel
2 spacers = 80mm travel
Now, the RS site lists the all travel options as 80mm/100mm/120mm and there are a lot of OEM 120mm Rebas out there on 09 bikes.
Merlin claim the forks they sell can't be extended to 120mm.
TF Tuned say they can.
Fisher said they didn't sell any 120mm Rebas other than the Maxle lite version. They acknowledged the existence of OEM 120mm forks but they didn't have anything to do with them so couldn't comment but did say the 120mm travel was acheived by "foregoing the all travel mechanism completely"
To me it seems logical that no spacers = 120mm travel however there are rumours of certain 09 forks having shorter stanchions meaning you can't remove the spacers completely.
I'm crying out for a set of 120mm forks and there are so many good deals on 09 Rebas at the moment but I'm wary of buying a 100mm model and finding I'm stuck with it at that travel!