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Easily the same range, or better, that full powered e bike. However, there are a couple of caveats. Jonny mentions that the power output reduces once the motor reaches a certain temp. In my experience, I can only run at 300 W for about 30 min until there is a noticeable reduction in power output. So if you have short-ish climbs, followed by a decent, you'll likely never notice as the motor has a chance to cool. If you're running something more modest, like 150 to 200 W, then expect >2000 m of climbing. I'm 180 lbs and my Slash+...

I put a 65mm stroke shock(same eye to eye) ,a 160mm fox 38,mulley wheels,shorter cranks and 35mm riser bars on mine-it's a beast downhill and very comfortable up-I ride in eco mode mostly as I'm older but my riding friends are younger and fitter on non e bikes so iit lets me ride with them on the ups.For me it works as an enduro type bike and is just heaps of fun.