This is for 255/85R16s. I thought sure a new KM2 would be very similar in all dimension to the old MT. Especially since the BFG site say it would have a 10" casing width on 7" rims and was 33.3" tall. However, I just got the new KM2 and it seemed much narrower. At first I thought this was an optical illusion. Since I kept my old MT spare to sell, (which has already sold) I figured I measure everything. Height and casing width are similar enough. What surprised me is the tread face measurements. From measuring the widest and narrowest section of lugs I was amazed at the difference.
Old MT: 7.25" wide to 8" wide.
KM 2: 6.75" wide to 7.25"
This is a difference of 1/2" on the Narrow section of lugs and 3/4" on the widest section. I not really sure this matters, but the width in lug face is quite noticeable and makes the tire seem not only narrow, but makes the tire appear more rounded (bulgie), like the side walls are not as straight and squared off as the old MT.
Now you make ask, does it matter? The truth, I don't know. But, with physics there is always a difference due to contact patch. Will this increase pounds per square inch, decrease rolling resistance, decrease floatation.....etc. Time will tell. I just wanted to point out my findings in case this would matter to anyone else.
Old MT: 7.25" wide to 8" wide.
KM 2: 6.75" wide to 7.25"
This is a difference of 1/2" on the Narrow section of lugs and 3/4" on the widest section. I not really sure this matters, but the width in lug face is quite noticeable and makes the tire seem not only narrow, but makes the tire appear more rounded (bulgie), like the side walls are not as straight and squared off as the old MT.
Now you make ask, does it matter? The truth, I don't know. But, with physics there is always a difference due to contact patch. Will this increase pounds per square inch, decrease rolling resistance, decrease floatation.....etc. Time will tell. I just wanted to point out my findings in case this would matter to anyone else.
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