Quote:
Originally Posted by pb and h
Maybe, I could have stated things differently, I do not have the instruments to measure the breaking distances, cornering, traction in rain/wet roads nor the harshness of the ride. Do you?
It seems that you are insinuating that I need an education, that which I have though it is not with tires but in chemistry.
Again, I am only stating my experience since I lack the above instrumentation nor do I plan on obtaining that info. People must make their own decisions; usually based on experience and knowledge which is what I have based my driving habits/conditions on.
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if u have a degree in chemistry good 4 u!!! i found orgo to be challenging (but doable !!). then u should be trained in the scientific method and know about objectivity (even lawyers will not represent themselves in court!)
i do recall learning about vulcanization of rubber in chemistry class not english class!
as for instrumentation hmmmmmm.......of course i do and so do u!!!!!
to measure breaking distances that depends if u are using a sledge hammer or pry bar, jk
to measure braking distances use your speedo
1. set your cruise to whatever benchmark speed and start braking (full slam, if u don't feel abs pulse do it again) at whatever benchmark place i.e a stick in the mud
2. then place a marker where u stopped, (use a different stick!!)
3. repeat with different set-up
4. analyze data
NOTE: keep variables at a minimum i.e. let your brakes cool between tests, do multiple tests and don't do 1 test on a sunny day then the next when it's snowing duh!
as for cornering, u do have to be a competent driver for this
1.pick you favorite on-ramp and see how fast u can go (read the speedo)
2. repeat with different set-up
3. analyze data
or
a safer method would be using a skid pad (a large vacant parking lot) and see how fast u can drive around in circle (mark out a narrow track) or have a friend use a stop watch and time how fast u can go
all the above can be repeated in different weather conditions
as for harshness...this is purely subjective and is so easy to "feel" u have to be unconscious not to be able to tell that 30psi is rougher than 40psi, but if u must.......
1. tape a cup, a bowl, or ideally a paper towel roll vertically placed, and put in a ping pong ball or whatever similar
2. pick a rough road that is paved (remember to keep your variables to a min so don't do this on say a sandy road, a hard packed gravel road is fine)
3. mark out a benchmark course (in a straight line)
4. drive through said course on cruise (the same speed)
5. see how high the ball bounces
6. repeat with different set-ups
7. analyze data
note: you could start out with a short length of tube and see if the ball bounces out (more trials the better), if the ball falls out then try a longer tube (higher length) then see repeat and see what length of tube the ball stays in
or
better still use a toilet paper roll and see how fast u can go before the ball bounces out then repeat with different settings and see what speeds u can go before the ball bounces out
science isn't about "what instrument u have or have not" but what instruments u can build or an experiment u can design with the materials u have around u
what kind of accelerometer do u think Isaac Newton used to determine his formulae of gravity or what kind of calculator do u think he used to co-invent calculus?
the Wright brothers were bike mechanics that built and designed there own wind tunnel (i think maybe the first)
the best instrument is your brain
. . . Calculators aren't really useful or necessary for understanding calculus except perhaps where one wants to do a complicated definite integral. Measurements for classical mechanics can often be done with modest equipment as you've indicated. Quantum physics and low temp physics are another matter entirely (not that either have anything to do with cars other than quantum p for semiconductors. 
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