BMX Bike Gets a Serious Reaming

[@askcyc]

GREAT VIDEO guys , I always insist on checking BB side before installing at least in twice at each side .. Unfortunately I have seem way too many undersized BB shells that I Use the reamer almost at the shop, better safe than sorry. One added note , Internal Micrometers are not the great at measuring ovality , thus an accurate Vernier caliper might be handy here too.

[@BBInfinite]

I demonstrate in the video how an inside mic detects opalization. Here's our position on vernier calipers: kzbin.info/www/bejne/bYK9loSAhbabjcU

[@goyacar]

Where can I get a ream like the one on the video? Can they be used on a carbon housing?

[@BBInfinite]

Yes, we use the same Park Tools setup to ream carbon and aluminum frames. Every bike shop should have this setup. www.parktool.com/en-us/product/head-tube-reaming-and-facing-set-htr-1 You will need the proper reamer for what hole size you have, and the flat, non-cutting backer.

[@TaylorSharp-o2s]

Is there way for the manufacturer to prevent this for quality control…

[@BBInfinite]

Yes, it's be easy to spot this kind of thing and solve the problem at the factory, but that would delay putting it in the box and selling to you.

[@TaylorSharp-o2s]

Do most bike shops understand this knowledge? How do we know we’re picking a quality bike shop??

[@BBInfinite]

"How do we know we’re picking a quality bike shop??" Oh boy, now that's a video all it's own that we can never make because by the end most---MOST---bike shops would not make the cut. It's more of a mindset problem than a skill problem.