from my experience, the 24t pully has much more even tire wear. but the 23t pully is faster (do not know the specifics as to why, but i get faster lap times with teh 23t pully--- i did numerous tests in qualifiers and compared the two). i run a 2mm split with the 23t pully. if you do not, after 8-9 minutes of driving, you will have smaller rear tires than front tires. 2mm split i have found to be perfect with the 23t pully.