Sounds like someone modified it for a track crankset. I've done that to an early Dura Ace crank on my beater fixed gear.
Roy "got a 151 crank on the Cinelli" Drinkwater Lititz "more rings on the way, thanks Ben", PA
Mark wrote:
> However, according to your method, the cranks are closer to 151s. The
>actual measurement came out to about 11mm, and not 10. I neglected to
>mention that the shoulder on the drive side arm has been ground down. What
>are the possible reasons that a crank arm would be modified like this? Newer
>bottom bracket?
> My continued thanks to you and the other reading, contemplating, and/or
>responding list members...