Sorry, yes mine is one of the late model type with large rear wheels.
I disagree with the view that you need better brakes because “the chain might let go”.If a Greenfield is in use and the machine is in such a poor state of repair that the chain is likely to disintegrate then the user has significant issues with an appropriate understanding of risk. In order for that to happen a greenfield is going to be in a very poor a state of repair indeed and flat out shouldn’t be in use.
This is a bit like saying rotary mowers with swing back blades are unsafe because a blade might come off and hit you in the leg. Sure, if you don’t do routine maintenance it might happen but it’s only going to be the case in either extraordinarily unlikely circumstances or because routine maintenance has been completely neglected.
