I'm planning to resole my Katana Laces for the second time. I'm debating between 4mm or 5mm XS Edge rubber. Theyre an all around shoe for me, and that said I most enjoy climbing vertical walls that require a lot of edging, and some crack and overhung sport and a little slab as well. I was leaning toward the 4mm for extra sensitivity on small edges, however the resoler suggested I may want to go with 5mm to stiffen the shoes back up a bit. Does anyone have any input?
I use 5mm for gym shoes, as it does seem to help with keeping the downturn as well as stiff (I'm heavy) and allow them to take more abuse, but I'm not sure I would do it for a pair you like to climb outside with. I believe 4mm is what they came with, so you would lose a little sensitivity. Inside, I don't really care. But if this seems like it may be the last resole your shoes will be able to take, I say experiment.
I just got a pair of Katanas back from Yosemite Bum, and I have to say I really like the evolve rubber. I got the Trax SAS and it feels insanely sticky on granite and still edges just as good as the original vibram XS edge rubber.