Originally Posted by
guy153
The decision to ream or not is based on the average of those two measurements because once you start pressing the cup in it will make it a bit rounder.
The average of your two measurements is 33.85 at the top and 33.78 at the bottom which should be about right, maybe a little bit tight at the bottom.
I would try pressing in the cups but carefully. If it's taking excessive force back up and reconsider.
If you did ream it first you might end up with the cups too loose because your dimensions would be about 33.8/34.1 which averages to 33.95.
Not sure how unusual a variation of 0.5mm is between the two dimensions but all the frames I've built have ended up slightly ovalised there after welding.
Hmm that makes sense, had wondered how easily the cups would deform it to round with 0.5mm difference. Still not entirely sure if it's worth getting it replaced, as I won't be able to return it as easily once I've touched it (it's a mass produced Taiwanese frame).
Originally Posted by
Canaboo
What is the material?
Sorry, should have said - chromoly.