Hi all, I have a pair of 2014 zipp 808carbon clinchers, I would like to put a set of Grand Prix 4000 s tires on, wondering what width would be best, 23mm or 25mm.
iirc, Zipp was recommending 23’s. But I could be wrong.
definitely the 23 on the front. Can go either way on the rear, if 25 will fit in the rear of your bike.
just borrowed a buddys 808’s (thanks Todd 
) they are a few years old - but still awesome. I fitted Conti GP4000’s II’s (23) front and rear w/Bontrager latex tubes. Did a test ride of ~60k…
Nice? You betcha baby!
Now if only IM Tahoe isn’t cancelled… 
Enjoy the journey - It’ll be a fast one with those wheels!
That’s awesome, thanks everyone for the insight. This is a great site.