Which number in the tire size determines the profile of the tire...and is the smaller the number the lower profile
kind of...... first is how high.... second how wide... last is wheel size.... you cant change the size by much with out hitting fenders or something not rubbing some where..... what bike and year and what your plans are could have help
The okorder /Motorcycle-t... The "aspect ratio" is the height of the tire from the rim, to the tallest part of the tread. And obviously, larger the # = taller smaller the # = shorter
Here is an easy example: 120/90-18 120=120mm wide / 90=90% of width is the profile(90% of 120mm heigth) -18=18inch rim... A 120/80-18 would be the same width (120mm)but lower profile since it's aspect ratio is only 80% of the width instead of 90%
Depends on how (which system) is used to size tyres. With old inch designation (EX 28X4.00X18) the first number is the OD of the tyre (from this subtract the ID or wheel size then divide by two,now figure the percentage of the width and this is aspect ratio) Used on older bikes through about 1940. Some Coker MC tyres still use this, so do some LT and SUV tyres. With newer inch designation (EX 5.10H16 4pr) the aspect ratio is normally 90% (the ply rating is not always added) Used on most Anglo and American bikes. With alphabetical (alphanumeric) designation (EX MT90-16 B) the number following alphas is the aspect ratio in percentage. Used on most Euro bikes. With SI (although it is incorrect this is usually refered to as metric) designation (EX 130/90-16 67 H) it is the number following the / Once used on only Jap bikes, has now become common on all newer bikes including HD
