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42T or even 46T on the back will probably work with long cage RD or Wolf Tooth *link.
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30 is already low on the front. What would a MTB double achieve? 28? 26 max?
I would go bigger on the rear if the derailleur can handle it -
If it's a GRX rear derailleur it'll probably do 11-40 or 42. I have this and it's great if you're doing 10km climbs with full camping gear.
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With a RX812 rear mech they could probably go to an 11-40 or even 11-42
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I run 11-42 cassette with GRX400 without goatlink or any other hacks. Not the smoothest shifts in the bigger cogs but works whenever I need to spin up some steep stuff.
hippy
PhilDAS
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Haistelija
@kndl
Getting back to gearing: a friend has grx400 on his bike with 46/30 front paired with 11/36 which does seem easy enough and yet he wants to go even lower.
Is an mtb double the chapest way to go? Also, das that warranty front der change?