Dropping the pressure in the very lightly constructed Kenda tires is REALLY not a good idea & it DEFINITELY does NOT help!! :yikes:
Not only will reducing the pressures in the OE Kendas make their already lightweight sidewalls much more prone to damage from road hazards, but it will also make their already 'less than normal strength' lightly constructed sidewalls AND the tread belts & compound FAAAAAAARRRR more prone to flexing & therefore heat damage & explosive catastrohpic failure!! :shocked:
As far as I can see, if you want improved ride, handling, & traction, then your only real choice is to fit properly constructed car tires & run them at the (lower) pressures appropriate for the load your Spyder imposes upon them. :dontknow:
MikeT, the tread doesn't 'wear down' to those triangles, but rather the triangles are there to help you locate the actual 'wear bars' that are found in the main grooves of the tread pattern - the bars that are found in the grooves where there are no corresponding triangles are actually water or ice breakers intended to help stabilise the tread blocks & to force any water or snow/ice that collects in those grooves as you drive on compromised road surfaces out of the circumferential grooves via the sipes so the tires will maintain traction!! If the water & snow/ice collect in those grooves & isn't forced out, you end up hydroplaning!! :sour:
So look for the triangles to help you locate the true 'wear bars' & if you find any bars in the grooves without the corresponding triangles, then they aren't 'wear bars'! :lecturef_smilie: