Originally Posted by
Chandne
Hope this is not a repeat from my side but anyway, I picked up 5-6 4000s to stock up. The 5000 (per the rep) is slightly lighter, slightly faster, and has a touch less puncture resistance. It is also sized accurately, unlike the 4000s. So the 25 will run very close to 25 in the 5000, while the 4000s run 27 or even 27.5. I measured them really close to 27 and 27.5 on two diff rims.
Unfortunately I can vouch for them being a tad less puncture resistant. It may have just been an unlucky couple of rides, but I had 4 flats in the same amount of rides back to back. I love the GPs though so I'm definetly sticking with them, just had to add some tire liners (I know I know) for a bit more peace of mind.