Rotor bolts weigh weenying- advice please- Ally/Ti mix of bolts.

Do you have a very low body fat percentage? 😀

I agree with njee20. Try foam grips, lighter stem, post (KCNC), bars, non-UST tyres, alu chainring bolts, lighter chainring(?), lighter chain(?), seatpost clamp(?). Plenty of places to save weight before heading for rotor bolts!

In noveau’s defence he is an astoningly fast ss rider, no stranger to the podium.

Seeing how easy it is to snap the heads off Ti rotor bolts, I’d go with three steel bolts over six Ti ones any day.

the new xtr race brakes, much better and lighter then the xt

Seeing how easy it is to snap the heads off Ti rotor bolts, I’d go with three steel bolts over six Ti ones any day.

Not if you use decent bolts/aren’t ham fisted!

Combine the brake disc / rotor and the rear sprocket (single speed)
something like a combination of this
http://www.fixedgeargallery.com/2008/nov/2/KayGarbrecht-2.jpg
http://www.fixedgeargallery.com/2008/nov/2/KayGarbrecht-4.jpg

and this
http://www.exilecycles.com/UserFiles/Image/parts/brakes/brakes2.jpg