Hi all
Here's something I've just discovered about using NSR tires.
First the problem-- After gluing and truing NSR tires I'll find a typical car runs smoothly and accelerates without hopping. Nice! Days or weeks later I'll use the same NSR-shod car and it hops (!) without any obvious reasons.
After some some extended testing it appears the NSR tires go out of round over time. Very surprising since my Slotit tires do not exhibit this tendency at all.
I believe here's what's happening.
While installing the tire on the rim a significant amount of tire stretch happens and it takes NSR rubber some time for the tire to rebound to its relaxed state. Gluing it to the rim may stretch the tire again. Then, if you true the tire soon after gluing to the rim it does not allow the tire time to rebound to it's relaxed shape.
If the tire is trued right after glueing , yes- it will be perfectly round but days from now the tire will have shrunk back to it's relaxed shape and is now not round at all.
The solution is to re-true them again after some time- OR to delay the initial truing a bit until that relaxation has occurred.
Hope this helps. Perhaps it explains some strange car behavior you may have experienced too.
Doc
Here's something I've just discovered about using NSR tires.
First the problem-- After gluing and truing NSR tires I'll find a typical car runs smoothly and accelerates without hopping. Nice! Days or weeks later I'll use the same NSR-shod car and it hops (!) without any obvious reasons.
After some some extended testing it appears the NSR tires go out of round over time. Very surprising since my Slotit tires do not exhibit this tendency at all.
I believe here's what's happening.
While installing the tire on the rim a significant amount of tire stretch happens and it takes NSR rubber some time for the tire to rebound to its relaxed state. Gluing it to the rim may stretch the tire again. Then, if you true the tire soon after gluing to the rim it does not allow the tire time to rebound to it's relaxed shape.
If the tire is trued right after glueing , yes- it will be perfectly round but days from now the tire will have shrunk back to it's relaxed shape and is now not round at all.
The solution is to re-true them again after some time- OR to delay the initial truing a bit until that relaxation has occurred.
Hope this helps. Perhaps it explains some strange car behavior you may have experienced too.
Doc

