On a recumbent you cannot use your arms during climbs. On a regular bike, when you pull your handlebars, that force adds up to that of your legs. On a recumbent it doesn't.
It is called regrression tot the mean, and predicted some while ago
On a recumbent you cannot use your arms during climbs. On a regular bike, when you pull your handlebars, that force adds up to that of your legs. On a recumbent it doesn't.