Slowman wrote:
scca_ita wrote:
On my P5-6, I use Enve 7.8 and run the Corsa Speeds Gen1 in a 25mm. The key is I am height LIMITED to 22mm. The newer Gen 2 Corsa Speeds are 24mm as is the Conti 5000 in a 25mm tire. Do you have any dimension info on the new Schwalbe Tires? I have a new set of ENVE coming this week and want to set them up tubeless.
the wider the rim, the lower the tire. so that's one thing. otherwise, i don't have a spec for you. honestly, i've not concerned myself with the height of tires, on road bikes. so i don't know.
Not exactly...at least not in the range of tire sizes and rim internal widths normally talked about. Tires of a given "size" actually increase width AND height on a wider rim (since they're mimicking a larger, truncated diameter casing) until you get to an inflection point where incremental width increases start lowering the height (with the limit being zero height when the internal width equals the casing flat width).
I had to concern myself with tire height on my 1st gen Cervelo S5 or they would rub on the fork crown and the rear wheel cutout. The worst offenders were the old GP4Ks, which not only measured oversize in regards to width, but also "tall" due to the parabolic shape of the tread mold. So...it can be a "thing" ;-)
As an example, here are a couple of quick views I did of a schematic tire/rim cross-section for the case of a tire that measures 25mm across on a 13mm internal width rim. The arc length (64.87mm) of the tire is constant. Observe what happens to both the tire width AND the tire height (above the brake track) as the rim internal width is increased to 17mm, 19mm, and then 21mm. Now, to be fair, the fact that the last 2 pics (19 and 21mm) show little change (especially as compared to the 17mm) in height means that this combo is approaching that inflection point where the height begins decreasing.
http://bikeblather.blogspot.com/