C2B wrote:
For races I'm running a Flo disc/90 or disc/30 depending on wind conditions. The latex tubes are going into the race wheels. I've got 23mm Continental 4000 S II's on them. I basically went with what Flo used in their original wind tunnel testing. I'll have one test ride before race day with the latex tubes. For commuting, on the same bike, I've got Shimano RS10's with Gatorskins and an extra a kevlar insert with butyl tubes. A few years ago I read a bunch of threads here and even with my size factored in everything seemed to indicate I should be running pressure in the 90's. I started out around 90psi, then 95psi, then 100psi and then said f' it and jumped to 110psi. The problem was that I kept pinch flatting at the lower pressures. From the 90 to 100psi experiments over 6 months I probably pinch flatted at least 6 times, always with the tell tale snake bite holes. Once I jumped to 110psi I never pinch flatted again, but did keep getting occasional flats from small sharp rocks, glass, etc. so then I added the extra kevlar and haven't flatted since on a commute. The guys at the bike shop were thoroughly confused when I kept flatting on Gatorskins. I even changed out the tires at one point in case I got a bad set and it kept happening.
I've never flatted in a race, but it is the commuting experience that has me pumping the race setup to the same pressure.
We're way off topic, but here goes anyways.
It sounds like you thought things through pretty well and approached it rationally. The big difference between your RS10 wheels and the Flo wheels (assuming they are the recent version) is that the inner width of the Flo wheels is ~1/3 larger. It will be a bit harder to get pinch flats at the same pressure on the Flo wheels, so it's safe to say you could lower the pressure for a better ride and *likely* faster rolling on real-world roads on the Flo wheels.
Since you're going to ride once or twice on your race wheels with new tubes before relying on them in a race, it would be a good time to test pressures too. If you're running the same size 23 tires front and rear (sounds like a road bike) maybe try 10% less pressure in the front to account for different weight distribution? You could start with your 110 rear and 100 front to see how that works. Maybe even drop another 5 psi front and rear? Going down to 90f and 100 rear could be pushing it too far at 230. Going to a 25 rear somewhere in the future probably won't affect aerodynamics to any noticeable degree and you could run both tires at the same pressure to give you slightly more comfort and better rolling out back.
If you're on the previous generation Flo's, I think that advice still holds as the inner width was around 17mm as opposed to the 15mm of the most recent Shimano RS10's.
