Personal chioce an all. But 42:25 seems a big, smallest gear. But if you're not doing long climbs then it'd be OK.
I tend to do the short sharp climbs on a normal ride 50:21or 23 (naughty cross chaining). Which basically means I dont use my small ring untill I hit the mountains proper. If I had your cranks I'd want a 12/27. On the plus side Your little ring is going to be more useful for day to day riding.
Personal chioce an all. But 42:25 seems a big, smallest gear. But if you're not doing long climbs then it'd be OK.
I tend to do the short sharp climbs on a normal ride 50:21or 23 (naughty cross chaining). Which basically means I dont use my small ring untill I hit the mountains proper. If I had your cranks I'd want a 12/27. On the plus side Your little ring is going to be more useful for day to day riding.
So you might as wheel see how you get on.