Originally Posted by
BCRider
MUCH easier as long as there is room to hold the threads. Compare the crank arms with more modern stuff. And if they are steel arms (I have no idea what sort of bike a Sierra is) then you should compare what drilling and tapping would do with a steel arm.
The big trick will be that you'll likely need to send the arms off to someone with the set of taps or get a set and do the job yourself.
Between the holes in the arms and the rounded edge of the arms, there is not a lot of space. Even if I could find someone to enlarge the holes to fit my Speedplays, I don't think it would be possible. I am, as I said, completely unknowledgeable about bike repair beyond the very basics.
$45 is a whole lot of money for two little adaptors, but at least I know that there is an easy solution to my problem. Would that be cheaper than switching out the cranks (which I don't know how to do)?