The traditional route ridden for many years. Traffic on Renfrew 508 has become heavy and Buckshot Lake 300 which starts at Ashton is a better choice for the ride to Vennachar.
Calabogie to Plevna 93km has hard climbing and no commercial services. Riders may be asking for water from cottagers.
This version returns through Lanark because the Pizzeria has been reliably open to 23hrs. But, then uses 6km gravel on Baptist Church Sideroad.