Ignore Sachs' input
,he's trying to sell you on 3 german tires-now who'da thunk it.
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I can't speak for the metzler 6 days,it may be the cat's arse,I've never used it.I have used Continental and metzler in the past and was very unhappy with all of them-of course,i haven't used every model either.
I really don't care what country a tire comes from,so long as it works.If I had the bucks and desire to change rear tires every ride,I'd run a Dunlop 756.The problem is,the edges wear quickly and when they do,performance drops of dramatically-not so with the S12.It wears but maintains performance when worn down.
Unless you ride the same track,I don't know how you can target one type of terrain.A typical ride around here will consist of granite,shale,sand,clay and goo.That's why I want a tire that performs well everywhere-maybe not the best for a given situation,but best all around.
I buy an s12,something else,another s12,something else and so on-always looking for a better skin.
New England terrain is about the same as NS so I expect an S12 would suit you well.
If you decide to get one,make sure it's an S12 XC.The XC's are a little harder and wear a little better-though both are great.
Your 250 has a 215 rim so a 110(130 michelin) is what you want.A 120(140M) will give you slightly better traction with slightly less cornering ability.It's not enough to be a big deal either way.
I have a 51 rear sprocket on mine and the clearance is the same as all the 110's I've had of other brands.
Whatever you decide,give us a RR.(btw,I run 12psi in mine)