J
Johan Bornman
Guest
In my hand I have a SAPIM brochure - Trust in SAPIM Spokes.
On the second-last page of the brochure, SAPIM has a graph showing the
estimated spoke life in wheel revolutions. The company's standard
double-butted spoke, the Race, has an estimated life of just under 1
million revolutions.
Let's say 1 million for argument sake, and that a wheel revolution
translates into two meters on the road. Therefore, the spoke life is
only 2 million meters or, 2000 kms. Not exactly something to brag
about.
Interestingly, but as an aside to this inaccurate estimate by SAPIM,
the company's CD-Ray product, a 2,3mm wide bladed spoke, has an
estimated life of 3,5 million "Wheel Revolutions (in cycles), as SAPIM
puts it.
Why would the company think that it's bladed spoke will last longer
than the round one? Since diameter is a difficult comparison in this
case, perhaps weight is. The bladed spoke has a weight index of 278,
whereas the round one 360. The index btw, is my invention, they weigh
278g per sample length per X number of spokes.
Johan Bornman
On the second-last page of the brochure, SAPIM has a graph showing the
estimated spoke life in wheel revolutions. The company's standard
double-butted spoke, the Race, has an estimated life of just under 1
million revolutions.
Let's say 1 million for argument sake, and that a wheel revolution
translates into two meters on the road. Therefore, the spoke life is
only 2 million meters or, 2000 kms. Not exactly something to brag
about.
Interestingly, but as an aside to this inaccurate estimate by SAPIM,
the company's CD-Ray product, a 2,3mm wide bladed spoke, has an
estimated life of 3,5 million "Wheel Revolutions (in cycles), as SAPIM
puts it.
Why would the company think that it's bladed spoke will last longer
than the round one? Since diameter is a difficult comparison in this
case, perhaps weight is. The bladed spoke has a weight index of 278,
whereas the round one 360. The index btw, is my invention, they weigh
278g per sample length per X number of spokes.
Johan Bornman