it will be interesting to see whether you notice a difference. I found the Racer to be sluggish. Did you replace both tires? The front matters almost as much as the rear.

I have a 349 wheelset and used a Brompton Green with great success. I've had a higher average speed with that tire than with a Stelvio+Slime liner and only 2 flats in 1500 miles.

Let us know how the tour goes.