I`d like to share a story now that you've shared this CHINA picture. I`m not saying this story applies across the board on all bearings made in China or any other bearings in the Norton but I`ll share what I personally studied with bearings made in China. I just spent the last quarter of last year testing bearings for tattoo equipment to reduce noise and get a more consistent amperage usage. I`ll tell you from my experience! I studied $1.00 per pc bearings that were made in CHINA and the same spec bearings made in Japan or Germany were between $5-$7.00 a pc. 10mm od and 3mm ID sealed bearing. There were no options of a better more expensive same spec bearing from China. I realize this is a lot smaller than anything in the bikes but the results blew us all away so read on if you`re interested.
THE IMPORTANT FACT IS ALL THREE BEARINGS HAD THE EXACT SAME SPECS!!! (but you will see that 1 of the 3 cheat the specs.) And the only reason this came up is because a purchaser thought he was doing good saving the company money on the same spec bearing. But after assembly, during testing it was obvious the machines were more noisy. We thought we had a bad batch and ordered another 1,500 bearings (from China). The purchaser did nothing wrong -- he was doing his job. No one got fired as a result of this experiment.. lol
With only changing the bearing and nothing else in a rotary style tattoo machine
Decibel level range 62-87 (price$1.12 CDN each)
JAPANESE and GERMAN had the same results so I will combine them.
Decibel level range 56-58 (price approx. $6.00 each CDN)
Also the JAP and German bearings use approx. 9% less amperage under the same conditions.
And the temperature was 1.20 degrees Celsius less on the Jap or German bearings after 1hr of being in use under a controlled environment.So, food for thought. PS : the tattoo machines now use only Japanese bearings.
Sorry for hi jacking your thread.