Thanks for the links.
There seem to be a many medium aero rims that meet at an angle with the breaking surface. I would
hope that someone has tested and found that any small hit on drag there is less than the improvement
at the tire to rim junction. Or is it just another marketer's whim.
--Art
"Jeff Wills" <
[email protected]> wrote in message
news:[email protected]...
> "Mike S." <mikeshaw2@coxDOTnet> wrote in message
news:<O0zWb.61043$F15.52507@fed1read06>...
> > "Art M" <
[email protected]> wrote in message
> >
news:[email protected]...
> > > What's the rationale/aerodynamics behind some of the odd rim profiles available? Specifically,
> > > the cutaway between the spoke holes on the Ksyriums and
the
> > > inverted cross-sectional curve of Alex R390 rims (pic at
> > >
> >
http://www.nashbar.com/profile_moreimages.cfm?category=113&subcategory=1128&
> > > sku=1128&brand= ).
> > >
> > > --Art
> >
> > Dunno about the Alex rims, but the Ksyriums cutouts are for reducing
weight.
> >
> > Mike
>
> If you want to look at rim cross-sections, look through the QBP catalog, in particular:
>
http://harriscyclery.net/site/page.cfm?PageID=49&SKU=RM7530
>
> The R390 is an odd cross-section, but I'm not sure I believe the miraculous properties listed on
> the Alex site: "Lighter yet stronger than conventional road bike rims with its inside arch design,
> it also helps to reduce wind resistance. The thicker inner wall prevents rim deformation caused by
> hard braking and improves durability, the deep round inner wall prevents the rim strip from moving
> from side to side, and the inner convex design fits the rim sleeve tightly."
>
> (from
http://www.alexrims.com/oe/index.htm - click on "Road Pro" then "R390" )
>
> Jeff