The Triathlon was definitely Reynolds 501 in 1988 and 1989. Reynolds 501 was almost certainly less expensive than Super Vitus 980. It was heavier and used less expensive seamed construction. Furthermore, Reynolds was a more recognizable brand in the US, which had the largest population of the targeted triathletes.

Another factor to consider is that by that time Peugeot had abandoned the French component manufacturers and jumped on the SIS banwagon, specifying Shimano 105 on this model, thus elminating the need to spec Super Vitus in order to keep the bicycle all-French.