A4 scale = 70%

Oval EGGrings custom cycle chainrings

Oval EGGrings allow you to pedal more effectively, powering your legs in greater comfort. They offer you real advantages in the following situations:

• climbing hills
• maintaining traction on slippery surfaces offroad
• overcoming the bobbing effect on suspension bikes

But you don't get something for nothing - an oval chainring simply allows you to pedal more smoothly and to work harder when you demand more power.

How Ovals work

As you turn your pedals, you encounter two dead-spots where you can achieve very little output. You will notice them when pedalling slowly up a hill - the cycle lurches forwards in spurts corresponding to each stab on the pedals, slowing down each time your feet pass the dead-spots.

Ovals reduce this effect by providing a lower gear to speed you through the dead-spots. You spend longer in the power-stroke, where your legs can push the hardest, which means you can pedal more powerfully too.

Power-stroke This is where your legs can push hardest. In this position an Oval acts like a larger chainring, giving you a higher gear.		Dead-spot Little useful work can be done here. An Oval acts like a smaller chainring, the lower gear helping you through to the next power-stroke.

Climbing hills

Have you noticed how your pedals always stop at the dead-spots when you grind to a halt on a steep hill? An Oval will help you pedal through them, keeping you going while you've still got some energy left.

Gain more control

An Oval gives a smoother power transfer to your wheel, reducing the stop/start effect which causes wheelspin on slippery surfaces and the bobbing effect which occurs on some suspension bikes.

Prices and how to order

Please see the EGGring pages for pricing details.   Click here to order.

© Chris Bell, 2004

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HIGHPATH ENGINEERING Cornant, Cribyn, Lampeter, Ceredigion, SA48 7QW, Wales, UK phone / fax:  +44 (0)1570 470035  (UK office hours only) email: