Putting 29-inch wheels on a Porsche is not usually a good idea. But when the Porsche in question is a bicycle, that’s a different matter. There are actually two bikes from Porsche Design: the aluminum-frame S and the carbon-fiber-frame RS. The former has an 11-speed Shimano gearset, while the latter enjoys a 20-cog setup. Just like the cars, shift action, braking, weight and handling have all been taken into account. The buyer must take into account a rough price of $4,775 for the S or $8,540 for the RS.