stu wrote:BRR is now testing grip. At least static wet grip, starting with road tires. IMHO interesting and useful but grip depends heavily on details so YMMV.
Their data is potentially misleading on a level road.... introduce a little camber to the equation and you get "interesting" data that is probably useless.
You might get a more useful test by measuring acceleration, slip angle, etc. using a quadracycle on actual roads. However grip will vary with small changes in the surface so getting repeatable results would be a challenge. IMHO the BRR slip tests resemble their rolling resistance tests in being helpful for some kinds of comparisons.
stu wrote:IMHO the BRR slip tests resemble their rolling resistance tests in being helpful for some kinds of comparisons.
I think this is the correct approach. It's too difficult to make definitive statements about something as dynamic as a tire, especially on mixed media and conditions.
I'm not sure if it's possible to test this in a such a way that the result will be meaningful in a real-world context. Too many variables at play that interact in ways that are hard to quantify but can have dramatically different outcomes.
