Gravelking Slicks - alternatives??

ccand51997 wrote:Aero matters about 10 times more than weight, but for a discussion on gravel riding, I think it becomes a lot less meaningful because the average speed is lower, at least for me because I ride a lot of hills, sand and mountains. Plus, if you want a tire that rides well on gravel then it is not going to be aero.  When I used to race tri/duathlon, I averaged between 23-25 mph and aero mattered very much.  Now that I average like 11 mph in my gravel races with 6-7,000 feet of climbing, I don't worry about it much.  

NoCoGreg wrote:

Chas: do your GP 5000's measure true to size?   The 4000s II all measured much wider than the stated size (28's measured almost 32,  25's measured 28).

The 28mm GP5000 is 28mm on a 19C rim

The 28mm GP5000 is 29.3mm on a 21C rim

The 28mm GP5000 is 30.5mm on a 25C rim
The 25mm GP4000 II is 29.9mm on a 25C rim

GP4000 II sizes were calculated on a 15C inner diameter wheel 10 years ago when 15C was the common size. That is, they measure true to size on a 15C wheel. As we have all moved to wider wheels over the last 10 years, the GP4000 II tyres now measure up bigger than what is printed on the side.

Conti updated the measurements with the release of the GP5000. The GP5000 sizes were calculated on a 19C inner diameter wheel, which is a common size today, so they are true to size if your rim is 19mm wide.

Many aftermarket wheels are wider than 19C, so if your inner rim width is larger than 19C, the GP5000 will measure up wider than the number printed on the side.

smoothmoose wrote:^^^ how do you know this...where do we get this info?

It's very annoying tires manufacturers put a number on the sidewalk, then a different ETRTO....this goes for Panaracer and Vittoria at least