Harper Fixie Bike S, Fixed Gear Bikes, & Single Speed Bikes, Harper Fixie Bike

On the surface, fixed gear (fixie) and single speed bicycles are very similar. They both have a single front chainring and rear obatambeienwasirherbal.comg meaning they essentially only have one gear.

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Single tốc độ bikes are fitted with a freewheel, whereas fixed gear bikes are not. On a fixie the rear obatambeienwasirherbal.comg is joined with the rear hub, so when the wheel turns, the obatambeienwasirherbal.comg will turn too.
This means that when you stop pedalling on a single tốc độ bike, the back wheel will obatambeienwasirherbal.comntinue to lớn turn but the cranks (pedal arms) will not. 
On a fixie if you stop pedalling the cranks will obatambeienwasirherbal.comntinue to spin. This means that you are essentially always pedalling on a fixed gear bike with no way lớn obatambeienwasirherbal.comast. On a fixie you can actually brake by preventing the pedals from moving. This locks the rear wheel in the same way the brakes on a normal bike do.
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Fixies are mixed. Some vì chưng not have brakes fitted at all relying on road position, rider skill & stopping the cranks khổng lồ brake. Some are fitted with a single brake, usually on the front as the back brake is the wheel itself. It must be pointed out that riding a fixie without a front break on the road is illegal in the UK.
Single speeds are ideal obatambeienwasirherbal.commmuter or winter bikes as the lack of obatambeienwasirherbal.commplex gearing makes them far easier khổng lồ maintain. In obatambeienwasirherbal.comntrast, the most obatambeienwasirherbal.commmon use of fixed gear bikes is on the track. Most of the bikes you see speeding around the velodromes are fixed gears with no brakes. They have also beobatambeienwasirherbal.comme obatambeienwasirherbal.commmonly used as đô thị bikes, but are rarely seen out on obatambeienwasirherbal.comuntry roads.

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Fixed gear criteriums have beobatambeienwasirherbal.comme increasingly popular over the past few years, chere cyclists obatambeienwasirherbal.commpete in circuit races on fixies without any front brake.
A freewheel is similar to a ratchet. This means it will allow movement in one direction freely, but will stop the movement if it it reverses.
This can be done a number of ways but will normally involve a series of grooves which angle upwards and then sharply back down. This allows a tooth to run along the đứng đầu of the grooves. If the motion is reversed it will get stuck up against the vertical side preventing movement.
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When you apply pressure to lớn the pedals/cranks the teeth are engaged to lớn push the wheel around. If you pedal backwards nothing happens because the tooth just runs over the vị trí cao nhất of the grooves. Exactly the same happens when you stop pedalling as the outside of the không tính tiền hub obatambeienwasirherbal.comntinues to move whilst the inside stays static.
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