Good quality if slightly heavy all steel BioPace SG inner chainring for triple chainsets, likely to last a lifetime of use! BioPace was designed to offer the rider a more effective pedal stroke, it was reasonably short lived but came back with a vengeance in the mid 2000s when the bike industry had run out of new things to invent. The oval chainrings supposedly put more power into the top part of the pedal stroke thus making you faster and/or making it easier.
- 28 tooth
- For 3/32″ chains
- 74 BCD
- Steel
- BioPace SG oval ‘technology’
- Late 80s/early 90s
- Made in Japan