Originally Posted by
A.Winthrop
Hi,
.
For the record I'm adding a 1983 Centurion Pro Tour. Its
serial number is N3A2083. It's full specs, taken verbatim
from a 1983 Centurion catalog, are below. Its geometry is
the same as the Pro Tour listed in the 1984 Centurion catalog
at
www.sheldonbrown.com/centurion (end of article). The
only differences are G and H in the table that accompanies
the labeled frame diagrame. The '83's angles are 73 degrees;
the '84's are 72 degrees.
Well, here's the finished product nearly a year and 4 months since A.Winthrop's post.
As I've related in the "Vintage Rides" thread, this build was a bit of a struggle. The LBS cracked the original cartridge bearing hub by trying to wedge the wrong size replacement in it. I wanted to keep the original derailleurs (which were both Suntour Cyclone MKII as they came to me, though I replaced the beat originals with a couple in nicer condition), but change the chainrings to a more useful wide range setup. The BCD on the SR Aerox is an odd 118, but I was able to locate an NOS 40T ring thanks to the ubiquitous SR Apex crank. Sadly, the FD would have nothing to do with a 52/40/28 setup, so back to the half-step gearing with the 46T middle ring. The brakes were a nightmare, due to the narrow spacing of the canti bosses up front. I couldn't get the originals to work with modern pads, so I went through about 3 other sets of brakesets until I stumbled on a set of blue anodized Dia-Compe 987s. To my 80's sensibilities, they don't look half bad! Then I went through three more sets of brake pads to minimize the brake squeal from the front. On a positive note, looks like the Dia-Compe's could handle a conversion to 700c from the original 27" rims.
At any rate, here you have it. Other modifications are Nitto Technomic stem, Nitto Mod 176 bars, Tektro R200a brake levers, Avocet Touring I saddle, 6 speed Suntour freewheel 14-28 (guess it's a Pro Tour 16 now?), new Sram PC-850 chain, and Malibu blue brake cable housing.
Oh, and I returned shifting duties from the supplied Suntour barcons to the spec'd Suntour Symmetric levers. This is one
smooth shifting friction system!