, sometimes called rolling friction or rolling drag, is the force resisting the motion when a body (such as a tire) rolls on a surface. The primary cause of pneumatic tire rolling resistance is hysteresis
. Hysteresis is the time-based dependence of a system’s output on present and past inputs. It has been identified in many other fields, even including economics and biology.
I got to thinking about rolling resistance and hysteresis recently thanks to both the recent Silca Journal entries
on the subject but also recent cycling trips I’d been on. The trips had some tough terrain but ultimately make my life easier. Friends, family and even clients see the (bike) time on the road and think it may negatively impact professional output. But they’re wrong.
“every time we lowered pressure, he went faster” - Josh Poetner
In Silca’s blog posts, Josh introduces Impedance as a form of resistance caused directly by surface roughness. “Imagine trying to start from a stop on cobbles, trying to ride over wash-board or a cattle grate, or rolling full steam off of nice pavement onto a stretch of gravel and feeling your speed drop while your watts climb.” This is the same as leaving an office job to start your own company or consistently kicking off new projects, too much PSI and your eyes will pop out. Finding the right pressure is key.
So seeing through the images of the brutal terrain in the Rapha Prestige Bohemia
& Eroica Limburg
rides (both at 95psi 700x25), I did over the weekend, there are business relationships, long term friendships and plain old headspace gained on the road. This directly correlates to diminishing hysteresis in my personal and professional life.
“It never gets easier, you just get faster” - Greg LeMond
Props to Josh at Silca for proving exactly what Impedance (hysteresis) can mean for rolling optimally on the road. In an economic context it helped me better understand why taking steps to relieve pressure at work enables me and the whole team to go faster!
As always, thanks for reading!