There are nine sport classes in para triathlon that compete in six medal events:

• PTWC1 - Most impaired wheelchair users. Athletes must use a recumbent handcycle on the bike course and a racing wheelchair on the run segment; Includes athletes with comparable activity limitation and an impairment of, but not limited to:  muscle power, limb deficiency, hypertonia, ataxia or athetosis.
• PTWC2 - Least impaired wheelchair users. Athletes must use a recumbent handcycle on the bike course and a racing wheelchair on the run segment; Includes athletes with comparable activity limitation and an impairment of, but not limited to:  muscle power, limb deficiency, hypertonia, ataxia or athetosis.
• PTS2 - Severe impairments. In both bike and run segments, amputee athletes may use approved prosthesis or other supportive devices. Includes athletes with comparable activity limitation and an impairment of, but not limited to, limb deficiency, hypertonia, ataxia and or athetosis, impaired muscle power or range of movement.
• PTS3 - Significant impairments. In both bike and run segments, amputee athletes may use approved prosthesis or other supportive devices. Includes athletes with comparable activity limitation and an impairment of, but not limited to, limb deficiency, hypertonia, ataxia and or athetosis, impaired muscle power or range of movement.
• PTS4 - Moderate impairments. In both bike and run segments, amputee athletes may use approved prosthesis or other supportive devices. Includes athletes with comparable activity limitation and an impairment of, but not limited to, limb deficiency, hypertonia, ataxia and or athetosis, impaired muscle power or range of movement.
• PTS5 - Mild impairments. In both bike and run segments, amputee athletes may use approved prosthesis or other supportive devices. Includes athletes with comparable activity limitation and an impairment of, but not limited to, limb deficiency, hypertonia, ataxia and or athetosis, impaired muscle power or range of movement..
• PTVI1 - Includes athletes who are totally blind, from no light perception in either eye, to some light perception. One guide is mandatory throughout the race. Must ride a tandem during the bike segment. A guide from the same nationality and gender is mandatory throughout the race. Must ride a tandem during the bike segment.
• PTVI2 - Includes athletes who are more severe partially sighted athletes. One guide is mandatory throughout the race. Must ride a tandem during the bike segment. A guide from the same nationality and gender is mandatory throughout the race. Must ride a tandem during the bike segment.
• PTVI3 - Includes athletes who are less severe partially sighted athletes. One guide is mandatory throughout the race. Must ride a tandem during the bike segment. A guide from the same nationality and gender is mandatory throughout the race. Must ride a tandem during the bike segment.

Both PTWC1 and PTWC2 classes compete in the same PTWC Medal Event. All the ambulant classes (PTS2-PTS5) compete in their own medal event and the three visual impaired classes (PTVI1, PTVI2 and PTVI3) compete into the PTVI medal event.

For a description of all classes please link to the IPC’s Laymen’s Guide for Paralympic Summer Sports.

World Triathlon has implemented some modifications to the classification system that was introduced in 2014 after further research was conducted to address certain aspects of the previous system. The research project is an ongoing project for both physical and vision impairments.

Access to the Classification webinars:
Para triathlon Classification Webinar part 1.
Para triathlon Classification Webinar part 2.
Para triathlon Classification Webinar part 3.