Metzeler Sportec M5 tyres aren't exactly soft compound tyres, they are med-soft. But it's true that they have less of a life w.r.t. others, but again, it comes with a level of performance like no other. If you believe in the saying, "Compromise on one aspect is biased on the need for the other", then it is pretty justified
.If one needs a set of tyres just to commute and tour, Metzeler Roadtec is a good option, and then there's the Pirelli AngelST (pure awesomeness
).It's not actually recommended to up/down size the stock profile of the tyres on the respective bikes. There can be minor to major cons rather than pros allow if one does that ignoring the cons completely. Normal mileage drop, raised or lowered height, mass centralisation is disturbed, misalignment, top end or acceleration issues (minor to major), etc...
Pros could be top-end/acceleration improvement, better grip during touring/cornering (depending on the structural profile of the tyre), comfort, etc..







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