Just got around to doing this, 200 g off each wheel is worth 15 s on a 10 km, 10% climb at 275 W. Balls.
If you're a weakling like me though at 100 W it's 40 s.
(disclaimer: I have no idea what power I do)
Probably closer to 275W than 100W. Unless you have spectacularly low gearing.
@Brommers started
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Just got around to doing this, 200 g off each wheel is worth 15 s on a 10 km, 10% climb at 275 W. Balls.
If you're a weakling like me though at 100 W it's 40 s.
(disclaimer: I have no idea what power I do)