it wont make a huge difference to put a smaller width tyre on, your only talking 10mm on the widest part and thats right on the edhes and i guess your not using it on full lean.
i have run tyres on my bike from 110s to 150s as long as the profile is not too big or small no problems.
the first number is the width in mm eg 110/80 is 110mm 150/70 is 150mm
the second number is the % of the width in profile so a 100/80 is 100mm wide and 80mm high. a 150/70 is 150mm wide and 105mm high a 140/80 is 140mm wide and 112mm high
hope this helps. remember different conditions mean different tyre sizes would be recommended anyway. for sand you want a big wide tyre to give a big foot print but for snow you would want a skinny tyre to cut through it.
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