ok had to do a little digging on this one. went to Ron Eyers to find the bearing part number and came up with 2 different bearings...one for the top and one for the bottom. come to find out the bearings are the same...just different races. PN 9116A and 9116 prospectively. they crossed over to Bearing part number HR320/28XJ which I then used to find the technical info on the bearing and came up with a inside diameter of 28mm and an outside DIA of 52MM... IMHO I wouldn't worry about our shaft size to much...but worry about what bearings will fit into our Necks...and then find a bearing that would fit both the stem and the neck...would make things much easier that way
Vulcan VN1500A will fit, but the tang at the lower end of the VN750 steering head for the steering lock will have to be ground off. The 1500A front end is a narrow-glide copy; dunno if the stem size is the same as the Narrow-glide, tho.
It dosn't matter if the stem is smaller. You could just make up the differance with a bushing 2.46mm thick or find a bearing with a inside dia. of 1" or 25.4mm. and fits the inside of the neck. As for length of the stem, if it's to long just cut it to length and rethread.
It may be a moot point. If what I measured this morning is right, a HD stem will be too short for a VN neck. The HD springer I have had a stem about 7-1/2" long ( the stem is missing, I measured from tree to tree). My VN 750 measured up to be about 8-1/2: tree to tree. After fitting bearings and lock nuts etc. the HD stem will be too short. The problem is I don't know if this springer is Sportser or Big Twin, IIRC there is a difference in stem lengths between the two..
Some one could verify my dimensions if they have access to a HD front end.
If you have a bare neck handy could the neck on the bike be shortened enough to fit the stem?
Also, you want to use only tapered roller bearings in a neck. Straight rollers can not be adjusted for preload.
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