Quote Originally Posted by Voicecoil View Post
The C rating is the amount of radial play available when cold - C1 is the least, C5 the most, C3 is in the middle obviously and seems pretty common. The reason for the larger play is to allow for expansion when the bearing heats up I think??
I was just looking at bearings on the CNC4YOU website and was wondering what the difference is/was between the C ratings that they sell. Saying that though, and with reference to you saying that C5 was the max, their cheaper option seems to be a C7 and it seems the average difference between their C3 & C7 varieties is about a tenner. So... Is it normally worth paying the extra?

Cheers