These are not for use with a Derny - Derny racing only requires a slightly raised gear from that normally used for track racing. Riders at Palmer Park Stadium, Reading which has regular Derny racing and has hosted the National Derny championships the last two years are only using about a 95in gear behind Dernys. 85-88in gear is the normal for this track otherwise. These rings are either for roller racing or for paced racing behind the big motors.
Hilary Stone, Bristol, England
Martin Coopland wrote:
> I have picked up a couple of unusual Campag chainrings, they are double
> shouldered ones for 1/8th chains. They have a huge amount of material around
> their outer edge. One is a 61 tooth and the other is a huge 66 tooth. I think
> they are for use with a derny and that's why I wanted one for my "Derny"
> project, but would like to sell the other, so that I can progress the
> project! You can have which ever you want, $85 including post.