400bhp
Guru
Its hard going on a 25 up winnats and I wouldn't choose that gearing for it. . But winnats is one climb I dont like.Just to personally give me some common denominator, how are you on Winnats Pass with the 25? I presume it's a compact too? I'm running a 34/25 lowest gear at the moment as my bike came with that cassette but I find Winnats unpleasant with that gearing. I'm interested in the fact you felt the Stelvio was OK on a 25 but maybe you dance up Winnats too!
Mentally, years ago (late 80s) I tried and failed to get up it on a 42-18. It was the only climb that I couldnt do at the time. Still haunts me...
Stelvio, in my honest opinion isnt that hard. Its well sheltered, the road surface is good and I would say maxes out no more than 15%. The hardest bit is the last 3km.