Does anyone make a higher performance 27" tire? By "performance" I am thinking of a high thread count more flexible side walled tire like the Compass high thread count tires.

I am asking to avoid the switch from 27" to 700c rims on a vintage bike. The rims have already been replaced from the original sew up tubular rims to a clincher rim.

I have ridden the Panaracer tires and find they are excellent all round tires that are nearly bomb proof, but this was a racing bike back in the day, therefore the sew up rims, and I would like to keep the 27" but get a tire with greater performance.

Any thoughts or suggestion welcome.