Hi,

I am currently riding an XC MTB with 27.5 x 2.1 tyres (54-584).

I seem to be using my bike more on the roads than off-roads over the last couple of months.
I am considering replacing the tyres to a more road friendly condition, however I still would like to go off-road every now and then as well. On a scale of 1 - 10. I would travel on the road maybe about 6 or 7

I am considering the Schwalbe Big Ben(27.5 x2) at this point.

Is it better;

-If i replace my rear tyre with the Big Ben and keeping my front knobby tyre as it is. I am assuming this would improve my speed on the road and maintain grip for some off-roading?

OR

-Should I replace both the tyres? Would I still be able to go off-road every now and then?

I am also looking for some other alternatives to the Big Ben, any suggestions would be helpful