Tire Question

They should be fine as long as there is no visual cracks, dry rot ect... Were they stored inside or outside? ... Get back on and have some fun... See ya there...

 

The most important question is were they stored in high temperature? If they were and have a significant amount of blueing on the tires that is the rubber's specific mixing oil compound seeping out of tire. The rubber mixture i.e. specific compound and addative oils is what gives the tire its pliability, durability, and grip potential. Rubber has a shelf life due to a natural curing process that occurs, heating and cooling is the enemy of rubber. Hence, why tire warmers are used to minimize heat cycles. Though if a tire just sits in elevated temps it will naturally cure into a brittle and hardend round hula hoop.

I actually think they would be good for street riding where most time is not spent at excessive lean angles, but being as they are 4+ years old I personally would change them out if $ permits. If not I wouldn't push them hard until all of the oil seepage is well scrubbed off, if the tires are really brittle you'll probably chunk them and need new rubber anyway. Just my 2 cents though.

 

coming back to trackdays on tires you dumped on 4 years ago probably wouldn't help with your confidence. buy yourself some fresh "sticky" tires and have that piece of mind.