for a start here are some of the Welsh cyclists who competed on the track at the Empire & Commonwealth Games 1958, apologies if I've overlooked anybody:
Don Skene (Bronze Medal in 10mile Scratch/1km Time Trial/1000m Scratch Sprint))
G.Humphries (13th in 4000metre Ind.Pursuit/10mile Scratch)
D. Evans (6th in 4000metre Ind.Pursuit/10mile Scratch)
C. Rees (6th 1Km Time Tria/ 1000metre Scratch Sprintl)
WHC Bodman (1Km Time Trial/1000metre Scratch Sprint)
RW Richards (4000metre Ind.Pursuit)
next stop is to find who may have been a Welsh Viking Pro at this time, hopefully this is of help
If he was a pro he wouldn't have ridden the Commonwealth games. Only amateurs allowed in those days. It looks like around a 22" size which would narrow the riders down slightly. Not sure it is team colours. Later team bikes were Red and White but that was in the 60's. In the 50's I think they may have been Silver and Blue, like this -
http://www.classiclightweights.co.uk/br ... iders.html
Might have to look through the magazines of the period for photos.
Today is the yesterday of tomorrow.