Some pro teams are now using clinchers !! - Gotta be good for us too

[giropaul]

All of my racing was done on tubs, the best of which were Clements, now probably no longer trading.  

The sound of Clement No. 1 Seta Extras on a concrete road at 140psi was awe inspiring!

They made a nice sound on wooden boards too........

and then there was the 'ping' when you gave them a flick with your finger after you'd finished pumping them up.

I think I may have assisted you with producing the "ping" at some point 

[giropaul]

PS - speaking as a purist and an anorak - silk for hard tracks, cotton for wood. Clement Sei Giorni were superb on wood.

[Exit Stage Left]

I've never raced, but in my limited experience, tubs offer superior performance and ride. For a given tyre-pressure, I think that tubs give a better natural suspension effect to the road.

It's not the tyres, it's the rims. Sprint rims are a shallow box section and are innately more flexible, clinchers have a deeper section to accept the bead, so they flex less.