Just ordered an S works SL2 frameset, bike has already arrived at LBS just waiting to be built up. Unfortunately due to funds will be built up using existing Ultegra group, but soon to be upgraded to Dura Ace possibly '09 version, Barmac and Kysrium Premium SL's complete the build. What sort of weight should i expect? Also what is difference between MOndo and Mondo s works tyres, which are lighter or more durable. Finally, forgot to ask at lbs is rear derailleur hanger replacable? I was looking at Roubaix vs Tarmac, I know roubaixs was replacable, but after test rides etc and viewing forum here changed mind at last hour to the Tarmac (worried if i got roubaix i would have regretted not getting the Tarmac, as reported as faster, stiffer and nearly as comfortable).