But is it really a mix of SRAM force with Shimano when your just using (basically) a truvativ crank thats been avaliable for ages...
This is not the same as a Truvativ crank unlike what many think, the SRAM Froce crank is a compeltely new crank.
The difference between the Truvativ Rouleur Carbon crank and the new SRAM Force crank is actually very easy to tell because the Truvativ Rouleur Carbon has carbon crankarms with an alloy spider.
SRAM Force on the other hand has a one peice right crankarm+spider in carbon.
That's the reason why the new SRM crankset is based on Truvativ Rouleur Carbon and not SRAM Force, becuse it's easier to just replace the alloy spider with the SRM unit, which you can't do with SRAM Force.
Truvativ Rouleur Carbon is also available with black spider, but unlike SRAM Force it's still an alloy spider.