From Retrovelo:

Retrovelo decided to take their Ponyvelo chassis and equip it with the legendary Schlumpf 2-speed bottom bracket gear box and thus create a 2-speed turbo Otto Duo. OTTO DUO is not for jelly legs – a “muscle-style” steel pony, made for a quick traffic light race. You’ll have a little smell of stud – but propelled by muscularity and not horse power. Also it is combined with Swiss understatement – reliable as Swiss clockwork, the kick with the heel does the trick to the wheel. You’ll shift the second gear as if you would spur your pony.

Specification

Frame size: 50cm (19.7″) / 52 cm (20.5″)

Frame type: Frame for 24″ wheel set

Brakes: Disc brakes and eccentric bottom bracket

Gearing: 2-speed SCHLUMPF “speed drive” bottom bracket gear box

Brakes: Avid BB7 disc brakes front and rear

Saddle: Selle Vintage Rolls

title=”Velorution: Frame bag” href=”http://www.velorution.biz/shop/retovelo-frame-bag/?s=retrovelo%20bag&st=shopp” target=”_self”>A frame bag is available for this Retrovelo bicycle.