The lightest bmx in the world is thetitanium grim reaper made by eastern. The frame weighs in at a amazing 2 pounds and the complete bike under 20.
I'd say titanium or alominium which is pretty expensive but the lightest bmx ever is the grim reaper by eastern hope this helped
The lightest bmx bike is owned by Samuel Powell. His bike ways 18.3 pounds and is built custom from the ground up. It totalled to about $2,300.
4 lbs. 1 oz.
A BMX stem is what connects the handlebars and forks to the frame.
The lightest bike for adults is probably a redline or a hyper but hypers are kind of expensive
you can buy a bmx frame, bmx parts and bmx wheels and bars from most online bmx shops.
Unbolt everything from old frame, assemble on new frame, done.
Eastern titanium grim reaper 19 lbs