brakemeister

it would be a shame to add an IGH internal gears to the helios SL .... weightwise anyhow...
dont use the word compact because it messes peeps up.... they usuaqlly have a huge gap double chainring, which the medium/small cage derrailleur in combination with short chainstays will not work on any foldy .... think adding an adapter and change the front sprockets... like go from a 53 to a 55 and add a 50 or 49/maybe 48 to the inner one.. any more difference and u run into shifting problems....
and keep the weight down on this classic lightweight