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Old 05-01-2009, 10:16 AM   #1
JLeather
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Default HD (probably sportster) frontend specs?

Got an aftermarket frame I'm mocking up in my garage at the moment and trying to figure out what neck it's got. I believe it's a sporty neck cause it's 6 7/8 long. it's not the removable bearing-cup style, it's just one piece of tube with a tapered race pressed in at each end. What HD frontends fit it (bikes and year-ranges)? I'm not up on which ones had what length stems and all?

Second question, since I think it's a sporty frontend. I need a frontend that's about 33.5" from the top of the tube to the axle. What is the stock-length of a sporty tube frontend so I know how much over-stock I need? I'd prefer to run a later-model dual-disc setup with a spoke front wheel (like an early 80's IH frontend) if it's gonna fit. Thanks guys, and pardon my ignorance on stock HD parts.
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Old 05-01-2009, 12:46 PM   #2
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Default Re: HD (probably sportster) frontend specs?

Are any numbers stamped into the parts?
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Old 05-01-2009, 01:54 PM   #3
Destralo Roach
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Default Re: HD (probably sportster) frontend specs?

He just has the frame, need's info on what front end to use, I would say 35mm would work, any year, but the dual disc was from 78-82 after you get one for about $250 then you can see if you need to lower the front or get new shorter tubes....................
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Old 05-01-2009, 05:27 PM   #4
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Default Re: HD (probably sportster) frontend specs?

Duh, that is what I get for talking a day off work. My brain shuts down.

What is the berring cup diameter, or can you see a part number on the edge of cup?

My wife's sporty is an 88 and it has a 7" neck so as far as neck length you should be good getting a front end up to 91. That does not account for the internal bearing size.

Last edited by Canadian_Bagger; 05-01-2009 at 05:38 PM.
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Old 05-01-2009, 05:53 PM   #5
Destralo Roach
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Default Re: HD (probably sportster) frontend specs?

The last front end that will work on the shorter neck is 1981, the 82-03 will fit a big twin bolt on, the shorter wont.....Roach.
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Old 05-01-2009, 09:14 PM   #6
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Default Re: HD (probably sportster) frontend specs?

Ah-ha. See, that's what I needed to know since I don't have any HD frontends in my stash. A sporty frontend up to '81.

Now, to further complicate matters, what if I wanted a 39mm frontend? A wide-glide is too wide for this bike, but isn't there some kind of mid-glide in between that and a narrow-glide? Are there any years of those that would fit, or would I have to get sporty wide-glide conversion trees to do it?
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Old 05-01-2009, 10:21 PM   #7
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Default Re: HD (probably sportster) frontend specs?

Don't get all fucking confused here, and make things more complicated than they are. It would have saved a lot of guesses if you'd have at least given the frame manufacturer, or a picture of the neck itself would have sure helped.

The neck you probably have is the FLT/FXR/late Softail style, that doesn't have seperate neck cups. Aftermarket frame manufacturers have been doing this style neck for a long time.

The races you probably have installed in the neck right now are probably Timkin #L 44610. Drop a set of Timkin neck bearings #L 44643 in your neck, and run any H-D 1" stem front end you want to. Trust me.
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Old 05-02-2009, 06:39 AM   #8
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Default Re: HD (probably sportster) frontend specs?

The neck is on an Amen frame made in the late 70's. I'll snag a pic of it when I get a chance. The races in it came that way when I bought it, so I don't know if there are any numbers on it or not.
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Old 05-02-2009, 08:42 AM   #9
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Default Re: HD (probably sportster) frontend specs?

And like I said, the neck is set up for the 35mm sporty neck, the bigtwinn neck witch I went out and mesured on my shovel and a roadking(dont use the reversed triple tree geomitry of the RK for reference) that is in my garage right now was 7" from flang to flang, the Ironhead sporty 52-81 uses the slightly shorter neck...........you can use the 39mm but make shure that you can slide a 1" neckstem in your frame, you would have to use a spacer ON TOP to make it work bolt on, never space your tripletree on the bottom!!

.........................................Roach.
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