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  #1  
Old 5th September 2021
The crack The crack is offline
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Sportster/Buell Model: XLH883
Sportster/Buell Year: 1988
Sportster/Buell Model #2: Electra Glide
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Other Motorcycle Model: Rz350, GSXR1100N,
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The crack is an unknown quantity at this point
Default Wheel ID

Just bought a project and I don't think these wheels are stock. Any chance that anyone knows what or where these rims and hubs come from or the manufacturer?





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  #2  
Old 9th September 2021
decman decman is offline
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Sportster/Buell Model: 1200S
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Sportster/Buell Year #2: 1988
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Looks like an Akront wheel, it will say it someplace if it is.
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  #3  
Old 9th September 2021
84rzv500r 84rzv500r is offline
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Default

Quote:
Originally Posted by decman View Post
Looks like an Akront wheel, it will say it someplace if it is.
that would be my guess too... they used to have a oval yellow sticker on them... agreed it should be stamped in the rim someplace...
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1999 XL 1200 Sport RX, SE 7500 ignition, SE air filter, DynoJet, K&N, Cone Engineering 2:1 pipe, Storz Steering damper, with 2012 XR1200X perf forks, 3.5 x18" wheels front and rear, Galfer stainless lines, XR1200 4 piston front calipers, 18" dunlop trailmax mission 120/90 and 140/80 rear XR1200X perf shocks with 1" lift blocks...

1983 XR-1000S to XR-1000RX Project Build Thread
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  #4  
Old 17th September 2021
Big Al's Avatar
Big Al Big Al is offline
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Sportster/Buell Model: XLH1200
Sportster/Buell Year: 1989
Other Motorcycle Model: Harley FLH1200
Other Motorcycle Year: 1974
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They look like Italian Borrani rims to me - Harley used them on 1970s XL and FX models.
The identification marks and H-D part number should be inside the rim where the tire bead sits.
Care has to be taken with some of these rims though, as H-D had these rims made to only take their 'safety' Goodyear tires, and were slightly undersize for other tire brands, leading to tire slip and possible blowouts.
The hub, sprocket and rotor look like racing items, maybe for flat track, etc...

https://scontent-man2-1.xx.fbcdn.net...c4&oe=616B7BBA

https://scontent-man2-1.xx.fbcdn.net...04&oe=61692948
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  #5  
Old 17th September 2021
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Big Al Big Al is offline
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Copied from one of the many warning web posts on some H-D Borrani rims...
"I've always liked the look of 18 and 19 inch rear wheels better than 16s. But there's something different and possibly dangerous about the Harley 18 and 19 inch rims from the '70s that I'm not sure most people are aware of. These rims are CM profile rims.

What does that mean? CM is the engineering term for the size and shape of the rim and bead seat. WM is an earlier designation, and it means more than just a width, (WM3 = 2.15" etc.,) but a specific size and shape. Current rims are MT or TL profile, at least in those sizes. The problem with the CM profile is that it's .075" smaller in diameter than the others at the bead seat.

Here's what Dunlop says about it. "Fitment to Harley-Davidson 18-inch and 19-inch CM contour rims may result in slippage or air loss. Harley-Davidson 18-inch and 19-inch CM contour rims are not compatible with Dunlop tires" Harley's recommendation to owners of bikes with CM contour rims is to replace the rims or wheels when the tires wear out. My boss, a Harley dealer since the late '60s (in a family owned dealership open since '62) tells me I'm not to even sell tires to guys I know have these rims on their bike, even if they want to mount them themselves. Harley Service Bulletin M-731 dated 6/20/78 deals with this issue.

How to identify these rims: This actually applies to steel rims of the same era as well. The Aluminum rims have a square drop center, a 2.50" bead width, and one of the following numbers stamped in them.

Number Material Size Hub/Brake

43005-70 steel 18" steel spool rear drum
43008-70 aluminum 18" steel spool rear drum
43002-70 steel 19" '64-72 style front drum
43010-70 aluminum 19" '64-72 style front drum
42998-74 aluminum 19" aluminum hub front disc
43018-73 steel 19" aluminum hub front disc

I have also heard of some Lester cast wheels being made to the CM rim profile, however Harley cast wheels are not CM rims.

You can also measure. Measure the circumference of a known good rim (say a WM3 x 18) against one of these and there's almost 1/4" difference at ther bead seat. .075(difference in diameter) x pi = .236".

The problem: If you look at the cross section of a tire bead like a foot, normally the whole bottom of the foot and the back of the heel are in contact with the rim. In the case of a normal tire on a CM profile rim, only the toe and the back of the heel are in contact, and the bottom of the heel is about .037 away from the rim. Less contact means more chance for the tire to slip on the rim. Since these are all tube type tires, the tube moves with the tire and the valve stem rips out of the tube, instant flat tire.

The only tires ever made for CM profile rims were Goodyears, marked "for taper bead base only" and are all at least 25-30 years old by now, not to mention impossible to find.

So it's Harley's, Dunlop's, and probably all the other tire manufacturers recommendation that you don't run these rims with normal tires on your scoot. But some people do and will anyway, including me."
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