1olbull
Riding Motor Since 1950
Steve, I think that you fouled up the math in your example a second way in that a tire has a top and a bottom, hence the height differential you provided in your example has to do with the and we're talking about altering the tire's height by manipulating tire dimensions. Fred did not change the rim radius of his wheel. He changed the diameter and section width of the tire, thus changing its height and said difference needs to be doubled because a tire sits on both the top and bottom of wheel(rim).
Please correct me if I'm wrong, because this is all pertinent not just to rider comfort, but, most importantly, it is vitally pertinent to rider safety.
Phil,
Regardless of the wheel size the final determination of axle height is the radius of the tire from axle to the ground.
The calcs in my chart include the front wheel sizes of each model and the aspect ratio of the tire.
Perhaps you were speaking of individual model comparison?
In that case, I should have compared only the front and rear axle heights of the Touring model.
ROCKET TOURING
The Rocket Touring boasts better axle geometry IMHO with the front axle .24 inch lower than its rear.
The proposed 140/90R16 front for the Touring has a 12.96" radius compared to the OEM 150/80R16 radius of 12.72".
This raises the front axle .24 inch and places it even with the rear axle.
Not too bad, but not as good as the OEM tire set up.
ROCKET ROADSTER