Joined: Jan 2009
Posts: 44,127
Likes: 6,343
From: New York, NY, and High Falls, NY, USA
Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem
I would keep the size. Tire choice isn't great, but you're not going to turn this bike into a racing bike.
I put 26" CR-18's on a three speed with pleasing results.