- Vire sized length, tooth size and V-angle
- Vire 6 has lower RPM than 7/12; hence bigger flywheel pulley, longer V6 adjuster; hence bigger belt
- Tested durability
- Always nice to have a spare onboard
- Easy to fit, others slightly the wrong size create difficulty fitting or premature failure
Please check pulleys inline and smooth or you may get premature wear. Ask me for advice if in doubt.