Vintage Crankset Restoration Quandary

[Walterscot]

I’m intrigued, if they are MTB specific then how come you had to retap the pedal threads from a tandem set-up? And then you’ve just thrown some BMX chat into the mix. I think a photo of the cranks would help to clear up any more confusion.

 

[Caj Remtiw]

I am sure you are aware that in the "earliest" days of Mt. biking there were Mt. bike tandems. These arms were threaded opposite than regular to be used on tandems. I am "attempting to salvage them ( make regular cranksets out of them) because they are very rare!