What is this bike part?

[weisan]

What is it and what does it do?

[hollowgram5]

Single speed tensioners for track dropouts

[weisan]

Thank yoy hollow pal.

[bicycletricycle]

those were made for BMX but would work on plenty of track bikes as well. I believe VG made the original spur shaped chain tensioners. Those are knock offs :)

[weisan]

Thank you tricycle pal.

[hollowgram5]

I believe Ryan is more correct than me; they do appear to be stout for bmx purposes!

[Davist]

VG (from San Jose I think) knockoffs as bicycletricycle says. You really only need one on the drive side. Looks good on your Boss Prime Time :)

[GOTHBROOKS]

i was a big fan of the primo lollipops back in 1997.

[bicycletricycle]

VG made really cool parts. I like that mid school BMX stuff.