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Amen this, granted i am getting older but i definitely notice the slower rolling resistance.
I should have got the gumwall kojak again but one they're not in stock anymore and two mu commute has increased from 10 miles to 20 miles and the tyres are going through their paces and having the better protection over speed is definitely worth it the trade off.
Still think it is a dick move from Brompton not supplying the smaller bike shops with the new marathon racer.
They are slow though...