Tag: chainring

Doval 34T fixed OCP 16% oval

After using the 30T oval on my 29er hardtail, I was convinced of the benefits that the oval chain ring brings to mountain biking: easier to rotate the cranks (no stalling) and the added traction from the lack of pulsating power on climbs. On other situations I didn’t even take notice that I was riding oval chain ring, that’s how natural it is to pedal!

So I naturally wanted an oval chain ring to my newly acquired 26 inch Specialized Enduro Comp (2011).

Specialized Enduro Comp 2011 in garage

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Doval 30T MTB3032 14% oval

After monitoring my current 2×10 (32-24 : 11-34) gear usage and comparing different oval chainrings I came to a conclusion, that Doval 30T 3032OCP would be good for my usage, but also ordered 32T 104bcd version.

  • only oval that is available for 104bcd in 30T size with the 3032 mounting system and 99.5bcd

    Doval 99.5mm bcd (image from DOVAL )
    Doval 99.5mm bcd (image from DOVAL )
  • “double oval” i.e. rapid transition to minor axis after power stroke on major axis (see mtbr forum for more pictures and details)
  • cheap and easily available from ebay

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Oval Chainrings ?

One day my trusted shop for bicycle parts ( bike-components.de ) had a banner on their site about oval chainrings and that woke my engineering curiosity:

what is this? why? science??

I started searching for information and soon discovered that there were multiple cooks in the mix and that oval chainrings could be the next thing in mountainbiking …or maybe just another gimmic?
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