7/8ths springer conversion bearing

[47str8leg]

Anyone know the part number for the timken bearing used in this set up ?

Tim

[TriNortchopz]

Need a few more details; are you looking to go from 7/8" to 1" on an ironhead? or is this 7/8 for a 45? What have ya got for bearing cups? Any measurements to share?

[47str8leg]

Need a few more details; are you looking to go from 7/8" to 1" on an ironhead? or is this 7/8 for a 45? What have ya got for bearing cups? Any measurements to share?

OEM 45 springer in a big twin OEM rigid frame. Been in there for 20 years. The bearing in it seems a little sloppy. Wondering if it was replaced at one time . It's smaller than what would be needed for a 1" neck but sloppy on the 7/8ths. Like about 15/16ths or so.

[TriNortchopz]

"bearing number L44640 7/8 NECK STEM FITS BIG TWIN NECK CUP "
see more here:
Thread: Converting 7/8" stem to 1"
"I have a nice 7/8" springer I want to use on a bobber project. Any info on getting it to work with the Big-Twin steering head"
http://www.caimag.com/forum/showthre...stem-to-1-quot

[47str8leg]

"bearing number L44640 7/8 NECK STEM FITS BIG TWIN NECK CUP "
see more here:
Thread: Converting 7/8" stem to 1"
"I have a nice 7/8" springer I want to use on a bobber project. Any info on getting it to work with the Big-Twin steering head"
http://www.caimag.com/forum/showthre...stem-to-1-quot

Yeah, that's the bearings I have in there and appear to be in good shape. Talked to a friend of mine who used the conversation kit years ago. Said he remembers not being to impressed with the fit at the time. Have to delve further into it.

Thanks for the information.

[TriNortchopz]

The dimensions for that L44640 Timken tapered roller bearing are:
inner bore of cone: 0.9375" (15/16")
outer diameter of cup: 2.0467"
The cup part #L44613

Width of cone: 0.580"
Width of cup: 0.500"
https://cad.timken.com/item/all-prod...t%20Dimensions

You just need to get a cone with the size of your springer neck stem, which I believe is 7/8".

Timken bearing cone #07087:

Bore: 0.875" (7/8")
Cone width: 0.5614"
https://cad.timken.com/item/tapered-...7087-07196-b-2

found this one on page 90 of the Timken bearing catalog:
https://www.timken.com/wp-content/up...ng-Catalog.pdf

[47str8leg]

Yeah we had measured it to the 15/16ths , which , is pretty sloppy. It's good for the bottom but I might try to see if I can get a tighter fitting dimension for the inside of the upper bearing or maybe see if a thin shouldered oil lite bronze bushing to take up some slop.
Thanks for all the specs.