How does a hub dynamo affect handling/rolling resistance?

A hub dynamo always adds rolling resistance when the cycle is in motion, but the resistance is so minimal that you will not notice it while riding. If the hub is turning steadily at a speed over 5 km/h, the resistance is almost eliminated. If the speed is high enough, the magnets hardly engage each other, and the resistance is negligible. The great advantage of hub dynamos is that when combined with sensor-equipped lights, the lights switch on automatically. This gives greater safety and ease of use.


Which tyre sizes fit on which rims?

The rim diameter is shown on the rims: for example 622 = 28”, 559 = 26”. The tyre width will depend on the type of cycle and on which rims are fitted. Your dealer can advise you as to which tyre width is suited to your cycle and rims.


What tyre tread profile do I need for road use?

The less tread a tyre has, the lower its rolling resistance. That means that riding it will be easier than it would be with a more pronounced tyre tread. A further disadvantage of tyres with pronounced tread is that they have less grip on smooth surfaces and especially round corners. If your tyre has plenty of rubber in contact with the road it has the advantage of really sticking to the surface. But in rainy conditions the water must be able to escape from beneath the tyre, improving contact with the surface. So almost all tyres retain at least a little tread.


How should I determine the correct frame size?

At Koga, frame size is measured from the centre of the crank axle (bottom bracket) to the top of the seat tube. This measurement in centimetres is the frame size. Your selected Koga dealer can determine precisely which frame size is best for you.


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