I might be interested as well depending on whether another ride goes or not. I've done this route before as well and I do ride a ninja 250.
For those that haven't been to the 507 before the hwy itself is a 70kph 2 lane (1 lane up one lane down) road. Please keep in mind there likely will be other bikes on the road and if enforcement is light you will likely see other bikes doing 160+ on the 507 (keep your eyes open and do not cross the center lines). You are also in Canadian Shield meaning off road jaunts will be a ditch followed by rock in many/most places.
Don't mean to scare people but as always ride within your capabilities. My last ride had 2 people go down with the one causing the crash being a noob thinking they could ride as well as the experienced riders.
As a point of reference, I found on the Ninja 250 stock tires (IRC's) 120 kph through the corners were fine. I'm on bt-016's now so if i can make it it's going to be fun.
Another note, there are no gas stations on the 507. The only one is at the bottom and after you are done at the top.
I would suggest the group break up into in essence slower and faster groups with leaders and sweep for both.
+1. good post NealT. 507 is not to be taken lightly. It is a fun road, but remember you will be sharing with other people ... potential hooligans who'll do 160+. Be aware of your surroundings and ride within your limit.
There's a Shell gas station in Bobcaygeon, and an Ultramar at the south end of 507 at Flynn's Turn.
Myself and another buddy are thinking of tagging along and meeting new people. We both used to ride 250s if that's cool, and we've met Afelotreyu before at a missisauga charity bike wash and at another UJelly's newbie ride where we helped to lead/sweep. I don't mind sweeping at all.