"ok sorry i shouldve specified. i own a 97 900rr and ive been working on wheelies. i find the colder it gets that when i drop the clutch it just spins out instead of poping up to hit the balance point. so that's why i'm looking for decent grip ;p 250's lack the power to burn out well in my opinion. usually its an accident "

FWIW - in cold weather (under 45f) doing wheelie practice - drop the rear pressure
to around 20 psi - you'll get a larger contact patch less likely to break out on ya

 

if you have the means and place to do it, do a good long hard fast straight line run on the interstate, high speed will warm the tire up quickly, also, the left right left right swerve at low speeds helps to warm up the tires. And like stated, lower the pressure of your rear tire, and tighten the suspension in rear and softer in front.

 

Swerving is ineffective for generating heat in motorcycle tires. It's been proven. Increasingly hard braking / acceleration is the 2nd most effective means.

Tire warmers is 1st