Bios gets reset

[whurlston]

I know. I just had to play devil's advocate.

[ACTCMS]

As I only just found out the other day, the first two digits are the diameter, the second two digits are the thickness

See that's what I like about this forum - even when you make a post which helps someone fix their problem, you still get to learn something new yourself... (there is a Trivial Pursuit question in there, dying to get out)

Actually, 2.5x20 wasn't too bad considering I estimated it from memory...