I think the chain will need another link to fit the 50T on.. maybe.
I've always ran 13-50 in my bikes. I find it just tightens up the ratios enough to keep it on song a bit easier and avoid having to knock back to 1st too often.
In saying that I'll be giving 13-48 a red hot go on my 18. If they make the extra powaaah they claim they do it should be aye OK.
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