How steep is it? Use the SkyMounti Inclinometer for an accurate grade measurement. Works like a carpenter's bubble level. Measures up to 20% up or down. Dependable as gravity - no batteries Measures Steepness of Ascents and Descents Fits 31.8 mm diameter bars. Supplied with rubber sleeve to allow fitment to old school 25.4 - 26.0mm dia handlebars. Scale: -20 - +20% grade Made in Germany Note: We caution you against reading the inclinometer when you're descending a 20% grade. (Seriously, we have to tell you this?)