UKC

Hi all, 

Brought a brand new Beal Joker 9.1mm 60m rope the other day thinking it was the same as the rope I already had, so I could use them as half ropes due to the Joker being a unicore rope. The new rope (blue) feel thinner than the rope I have now which I believe is the Joker 9.1mm as well. 

If anyone is able to assure me they are the same rope or tell me they are different and what rope the (yellow) one is would be brilliant. the Yellow rope is definitely a Beal rope, as its rope bag it came with is Beal. I just can't remember the model

(Please view my gallery to find the picture of the ropes).

It might be the same.  Ropes do fatten up with age.  It doesn't matter for use as half ropes - you can use ropes of quite different diameters as half ropes absolutely safely provided the belay plate isn't restricted

Use them as half ropes, they don't have to be the same diameter.

Another answer is that your older rope may just have fattened up as ropes do with use.

Most probably your original rope was a Beal Joker from several years ago, when they were 9.8 (?) mm and the new one is the newer thinner model.

Ah okay, I did think maybe the 9.1mm might be a revised version. Cheers for all the feedback guys

Joker has always been 9.1mm. 

But as others have said, it will became fatter due to wear. My old (now long rerired) Joker (per unicore) was actually fatter than a new 9.8 Beal Diablo (unicore).

Oh wow, was that down to use or it was genuinely fatter from the start?

From use... but to be honest, rope diameters are no different than the length... So they might be a tad different than what you expect from the numbers...