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@Bartroll
Not sure if this is the correct place to post this but:
In 2 weeks there's a Fixed Gear UpHill TT. 2km ~ 7% with around 200m 10% and some other parts around 9%.
I've, 50, 48, 53, 34t chainrings. 34t is 9-10sp
I've 14, 16, 17t cogs
I'd use 34x16 but not sure if too spiny+175mm cranks´
My best time on that climb is around 7:05, 15km/h avg 26.3km/h top after 50km.