POLKA BIKES AURORA
Revolution is in place! It is no longer necessary to visit the North Pole in order to see the northern lights. Aurora from Polka Bikes may be admired both at night and during the day, in the cities and in the countryside, regardless the current activity of the Sun.
So far we have ridden the advanced machines, whose capabilities we have not been using, on the roads for which they have not been adapted. We have wasted our time to adjust and repair the mechanisms that we do not need, in bicycles which we do not like. Technical progress has equipped us with dozens of complicated instruments. In concept, they are intended to make our life easier, however in practice what is happening is the opposite.
It’s about time to turn things around – we introduce Polka for Everybody!
24 months warranty for components, lifetime warranty for frame.
Frame: TIG welded, 700C; sizes 50/54/58/60 cm, cromoly 4130
Fork: TIG welded unicrown, 700C, cromoly 4130
Headset: Neco, ahead headset
Rims: Stars Circle Swift Arriv, 700C, 43 mm deep V-rim, 36 holes
Spokes: 282/284 stainless steel, brass nipples 14mm
Tires: CST, C-1406, 700*23C
Tube: CST, 700*23~25C, presta (60mm)
Front hub: Joytech, track hub, 36 holes
Rear hub: Joytech, track hub (fix/single), 36 holes, COG 16T
Grips: Kashima 110mm
Handlebar: riser, 54mm width
Stem: Ahead, 90mm, alloy
Seatpost: 250mm, alloy - 27,2mm
Chainwheel: 170mm arm, 44T
Chain: KMC, 1/8"
Pedals: VP 565, aluminium
Brakes: Tektro R315 , aluminium
Bottom bracket: Neco, 106mm
Our bikes all come with a flip-flop hub, which means they have a freewheel cog on one side of the rear wheel and a fixed cog on the opposite side. This means you get to choose whether you want to run free or fixed, and you also have the freedom to switch back and forth between fixed and freewheel anytime.
Let’s start with freewheel. Freewheel is what most riders are familiar with. If you pedal forward, you will move the bike forward. If you stop pedaling, the pedals will simply stop and you will coast, and if you pedal backwards…well, nothing much is going to happen.
Fixed gear, on the other hand, is slightly different. Fixed gear means that the motion of the pedals is directly connected to the motion of the rear wheel. If you pedal forward, the bike will move forward. If you stop actively pedaling, but the rear wheel is still turning, the pedals will continue to turn. This means there is no coasting, if that back wheel is spinning, so are the pedals. And if you apply reverse pressure to the pedals, you can slow the rear wheel, or move the bike backwards if starting from a stop.