Almost witnessed an HD wreck just now


MCs can indeed stop better than cages. Testing has shown an MC (even a police Harley) can develop greater than 1.0g stopping.
Cars on average develop .75g. Some of the spendy ones are up in that 1.0 range as well.
Where the rub comes into play is that the "average" motor rider only develops about .55g to .65g due to the of lack of skill.
ABS brings that same "average" ride up ro .75g to .85g. That is why it is so critical that ABS be on motors.
Mass and rubber actually have little to do with stopping because coefficient of friction (tire to roadway) is a valueless number ratio of µ=F/W (mu = Force/Weight).
Mass = Weight / gravity so since gravity is a constant, simply using the vehicle weight divided by the Force (through the center of mass) that it takes to slide a vehicle with brake locked tires.
Changes in rubber, aerodynamics, etc are very minor and insignificant for calculations (hydraulic brake systems). Air brake systems and hard high mileage tires found in large commercial vehicles are a different ballgame and develop roughly 75% to 85% that of other vehicles.

I hope this helps . . .
 
Reactions: idk

I would say with ABS the beginner to intermediate can stop as well as a cage.
An expert rider w/o ABS can easily stop sooner than a car.
In testing I have seen some cars hit .9g to 1.0 g.
I have seen way more motors hit 1.0g to 1.2g.
BTW - this is from 30 mph to 60 mph testing.