The 1993 Balance ST640 is a 21 pound a triathlon/road bike with a steel Tange Prestige TB frame. The ST640 is a is a lighter bike at around 20 pounds. It was released in 1993 and costs $1,249 brand new. The ST640 is fully rigid.
The ST640 comes with Shimano 600 Ultegra STI components, including an aluminum SR stem and Shimano 600 Ultegra STI shifters.
The ST640 has 8 speeds and has a Shimano derailleur.
It comes with tires (622mm x 20mm) and Araya CT-19 rims.