That may be a good trade if they both are in equal condition. Not sure that is the case and it sounds like you really want a 625 anyway. I would pass this one up unless I could handle the 25 and it felt "right". I have both a 29-5 and a 25-2, love them both and would not part with either. This won't be the first time you've heard this here but you really need both!

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Hand tighten only