New old boy with a question regarding Quick Release wheel

[mzsupa5]

What you don't realise is how energy works. When you ride a non-electric bike, you might average around 10 mph. When you fit a motor, your average speed would increase because you'd have your own 100w pedalling plus 250w from the motor, which is nearly 4 times the power. let's say that your average speed increases to 14 mph. Energy (E) = 1/2 mass times velocity squared, so would increase from 1/2 x M x 10 x 10 = 50M to 1/2 x M x 14 x 14 = 98M, which is roughly double.

That energy has to be changed into heat by the brakes in order to stop you, so if your braking is about right with your bike like it is now, you'd need two sets of brakes on each wheel to deal with your new higher energy when you have the motor. The result is that the rim brakes wear out and go out of adjustment very quickly, they wear through the rim to cause catastrophic failure of the wheel, which we've seen many times on this forum and is just a matter of time before it happens, and the braking becomes inconsistent and unreliable. It's your choice!

If you only weigh 50 to 60kg, rim brakes might be OK, but not if you weigh anything near 100kg.

I can't recall ever having to make a crash stop from 14mph, just stopping pedalling is enough to reduce speed most times thans to wind resistance. Most of my braking is to trim speed on descents so the only additional demand on the brakes is from the weight of battery and motor and this is a linear relationship (kinetic energy half MV squared ) Yes rims and brake block wear out but V brakes are pretty good and the limiting factor is going to be tyre adhesion anyway.

 

[soundwave]

or a phone zombie walks strait in front of you and am now 12% t1000

 

[saneagle]

I can't recall ever having to make a crash stop from 14mph, just stopping pedalling is enough to reduce speed most times thans to wind resistance. Most of my braking is to trim speed on descents so the only additional demand on the brakes is from the weight of battery and motor and this is a linear relationship (kinetic energy half MV squared ) Yes rims and brake block wear out but V brakes are pretty good and the limiting factor is going to be tyre adhesion anyway.

For somebody that rides/rode an MZ Supa 5 with the worst brakes and tyres ever on any motorbike, I'm not surprised that you think like that. For me, the most important thing on any bicycle or motorbike is the brakes (jointly with tyres for a motorbike).

 

[mzsupa5]

Haha yes. Now in my 50th year of on and off MZing Yes I had Pneumant tyres on my first bike. Current one has a Honda TLS front brake. Now on Dunlop and Metzler tyres. My first bike was a Lambretta which had no functioning front brake at all for 6 months as an impoverished schoolboy I had no resources to fix it. Suppose I have survived by being aware of what stopping power I have available.