Re: hello all new here with a few questions :)
I just got my bike started for the first time this weekend and I am using opti 2 at 100:1. So far so good but too early to tell.
I am running a mountain bike with rim brakes on front and rear. I must say it is barely enough braking power. Anything less would feel unsafe. I think a front disc brake and rear coaster would work well.
Also about the opti 2. I bought it at a store that only sells landscape equip mostly to proffesionals and they said it makes their equip last way longer.