need O.D. of big twin springer fork stem (at the base)

[scottmckelvey]

where the centering cone is, to at least the .00" but prefer .000". Hopefully someone has a springer laying around and a set of calipers.

Thanks in advance

[skyrider]

Wewll, went out to measure one, reached into the cabinate where I keep my micrometers...the whole fuggin wall collapsed...Guess I know what I am doing today...

two weeks ago...




after opening the cabinanet....granted I haven't opened that door in a year or more..

Worse part?

the Mic's aren't in there any more...no telling where I left the,,,

[Bigincher]

Man, I hope nothing was damaged...!
But at least we get a sneak peak at your wall art...... nice stuff..!

[Ar Amytas]

I have all that but shop is quite far away and I'm heading for surgery in the morning. ):

[skyrider]

Man, I hope nothing was damaged...!
But at least we get a sneak peak at your wall art...... nice stuff..!

I caught a 4 fin jug, just before it hit the floor, then still saved that shovel rocker box..I feel like I should compete in the olympics...(gawd I had to look humorous, glad no one was here)

[scottmckelvey]

To wrap this up, Rubone was kind enough to measure a couple. He quoted me 1.035" plus or minus a thou.

I was hoping to find a timken out of the box that would work w/o modifying the stem or neck cups (i this case I had a painted frame with timken neck cups.... and I didn't want to deal with disturbing them). Well, I guess you can't, at least not using a "Timken" (I'm not counting using a spacer over the bottom of the stem, which creates issues with the stem being too short, not to mention raising the bike an inch or so). I'm sure people have been through this 100xs over, but I couldn't find any concrete info, so I'll put it here in case anyone is looking in the future. Below are the Timken combinations that fit the stock '60+ neck cup (L44643/L44610 being stock). Even if you modified a neck cup to fit a different race, there's still not bearing that's even within .004" of the 1.035" measurement.

That said, I've converted to timkens by shaving the base of the neck stem with a file and die grinder until the L44643 fits all the way down to the crown. Other than being a little time consuming the only down side is that you can't go back to stock, but no other mods are necessary.

Dimensions (in)


Load Ratings (lbf)
Cone (Inner) Cup
(Outer) (d)
Bore (D)
Outer Diameter (T)
Width K Factor C1 C90
L44640 L44610 0.9375 1.9800 0.5600 1.56 6260 1620
L44642 L44610 1.0000 1.9800 0.5600 1.56 6260 1620
L44643 L44610 1.0000 1.9800 0.5600 1.56 6260 1620
L44649 L44610 1.0625 1.9800 0.5600 1.56 6260 1620
L45449 L45410 1.1417 1.9800 0.5600 1.58 6230 1620

[Rubone]

That said, I've converted to timkens by shaving the base of the neck stem with a file and die grinder until the L44643 fits all the way down to the crown. Other than being a little time consuming the only down side is that you can't go back to stock, as no other mods are necessary.

That was the standard method of doing that as far back as my experience with them goes, over 40 years!
Robbie