2009 at the Hammond Barn

[Grant Bowker]

The design record lists two types of 16" rim. One is listed for 9.25x16 (HUP)tires, the other for 9.00x16 and 10.50x16.
Both are DND designs (not K-H), and are listed as having 6 inch width and 10.827 inch mounting bolt circle. (They could be K-H made and DND designed)
The one for 9.25x16 tires weighs 46 pounds per wheel, has a 5 degree rim taper, 1-1/8 inch flange height and 0.5625 inch centerline offset.
The other type for all other CMPs weighs 67 pounds per wheel, has a 1-1/2 degree rim taper, 1-1/2 inch flange height and 0.250 inch centerline offset.
The weight difference seems to be mainly because the HUP rims are made from thinner stock. It is probably possible to mix HUP and "other" CMP wheel halves and have a driveable wheel, but due to the different geometyr of the rim and the different offset I don't hink I want to make the experiment to prove it works or otherwise. My first explanation for the different offset was that the tires were the early equivalent of "wide profile", then i thought again (10.5 is wider than 9.25) (even stranger, the 9.00 cross-country tires had a wider section than the 9.25 ones - I don't understand).

Comments on Bob's theory - anything could be possible on a one-off prototype basis, but would they create a die to mark a one-off rim? Most HUP rims are 5 degree taper, not 0, that's why I think their tires are less evil to remove from the rim.
The only rims listed as Dunlop designed (as opposed to manufactured) are in the 5.00x18 size for 7.00x18 tires which had comparatively narrow .75 inch flange width, 3 degree rim taper and a bolt circle different than all CMPs but closest to the C8's rims for the 9x13 tire.