Download SKC chrome extension. Calculates your "Steven Kruijswijk Coefficient" for Strava rides and shows it on your Strava ride page. and install in your Google chrome browser. This is Direct SKC Crx download for Chrome it is also called SKC offline CRX for chrome Download. This SKC is used to Calculates your "Steven Kruijswijk Coefficient" for Strava rides and shows it on your Strava ride page.