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19" Drop Center Rim

Wheels, hubs and tires
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fl9018
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'51 FL Bobber
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19" Drop Center Rim

#1

Post by fl9018 » Fri Mar 15, 2013 3:31 am

I laced up a 3 1/2" wide x 19" drop center rim to a star hub. I put a brand new Avon 3.50 x 19" tire on it and it doesn't look right. Like the tire is too skinny for the rim. Does this rim really need to take a 4.00 wide tire???



RUBONE
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Re: 19" Drop Center Rim

#2

Post by RUBONE » Fri Mar 15, 2013 4:31 am

Which tire profile do you have? Factory fitment on Sportsters and FX models were that size, however if you are using a modern profile tire with short sidewalls it will look really skimpy on there.
Robbie

fl9018
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Re: 19" Drop Center Rim

#3

Post by fl9018 » Fri Mar 15, 2013 4:46 am

It's an Avon ribbed Speedmaster 3.50x 19. It looks ridiculous with the edge of the rim sticking out beyond the side wall of the tire.

caschnd1
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Re: 19" Drop Center Rim

#4

Post by caschnd1 » Fri Mar 15, 2013 7:10 am

That rim is too wide. For a 19x3.50 tire you need a 1.85" wide rim. The 3.50" wide rims are typically used with a 5.00 wide tire (16x3.50 rim for an Avon SM MK-II 16x5.00 tire). 3.50" is even too wide for a 4.00 tire. The Avon SM MK-II 18x4.00 requires a 2.15" wide rim.

Are you sure it's 19x3.50? I can't find a drop center rim in that size listed anywhere.

-Craig

Tunglegubbin
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Re: 19" Drop Center Rim

#5

Post by Tunglegubbin » Fri Mar 15, 2013 8:49 am

"This thread is useless without pitctures"

Isn't that a model K front rim? What tire did they come with?
I don't think a 5.00-19, as suggested, exist?

/Mikael

Tunglegubbin
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Re: 19" Drop Center Rim

#6

Post by Tunglegubbin » Fri Mar 15, 2013 12:52 pm

Ops! my bad, a K rim is only 2 1/4"

1950Panhead
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Re: 19" Drop Center Rim

#7

Post by 1950Panhead » Fri Mar 15, 2013 1:21 pm

Panhead rims are 16" x 3.00", the tire is 16" x 5", the tire is 2" wider then the rim.
Jerry

FlatHeadSix
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Re: 19" Drop Center Rim

#8

Post by FlatHeadSix » Fri Mar 15, 2013 2:48 pm

I've never been exactly sure about where to measure the width on those rims, inside the bead? outside edges of the bead? ? the 19" drop center rims used on the '30 to '36 VLs measure 3 1/4" across th outside edges of the bead, and those took a 19 x 4.00 tire. for whatever that's worth....
mike

58flh
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Re: 19" Drop Center Rim

#9

Post by 58flh » Fri Mar 15, 2013 3:02 pm

9018--its a nice-rim you got!,Wrong tire,that rim can take a 5 on it as long as rubber dont hit fenderbolts!-If you want a 4 on it I can tell you I never tried it!,but that avon is ridiculousely slim on sidewalls!-5 will have more meat on the side if thats to wide for you Imsure a 4would fit & give you substance if you find that from a vendor!--As was said a PIC. would help & hunt the sizing pages for different manufactureres!---Im sure AVON has a the 1 your looking for!-(call & tell them your situation!---respecfully--RICHIE!

RUBONE
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Re: 19" Drop Center Rim

#10

Post by RUBONE » Fri Mar 15, 2013 3:06 pm

Rims are measured inside the bead and are sized in standard sizes, WM0-WM3 were typical sizes used on vintage bikes with the H-D and Indian 16" rims being the exception.
And that rim is not 3.5 inside.
And yes, the flanges on that deep drop center 19 will be wide for a Speedmaster. Old type Speedmasters have a very straight sidewall. The tires that came on those rims had a different construction and actually have a bit of a step in the sidewall that allows them to open up wider near the flange and create a much more rounded profile for an improved contact patch.

fl9018
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Re: 19" Drop Center Rim

#11

Post by fl9018 » Fri Mar 15, 2013 3:18 pm

I will try to post a photo later tonight. Here’s how this whole mess began. I bought an Italian made 19” drop center rim off a late 70’s Super Glide. I then laced it up to a Star Hub so I can put it on my ’51 panhead with a wide glide front end.
The way I measured it was wrong, I measured the outside edges of the rim and came up with 3 ½”. I should‘ve measured where the bead sits in which is roughly 2 ½”. It’s hard to say what the rim width is right now because I have the tire on.
A better question to ask is what size tire was used on a late 70’s Super Glide with a front 19” laced up wheel that happens to have a drop center.

fl9018
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Re: 19" Drop Center Rim

#12

Post by fl9018 » Sun Mar 17, 2013 9:11 am

Frank's Misc 159.JPG
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VPH-D
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Re: 19" Drop Center Rim

#13

Post by VPH-D » Sun Mar 17, 2013 2:09 pm

70s XL and FX models used a 375x19 front tire. You'll need to change the rim or the tire to have it look right. If you want rib look, try Continental, the have a semi rib 19" tire that should look OK on your rim. If you don't need the Speedmaster look, then there are many choices in front tires.
VPH-D

drinner-okc
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Re: 19" Drop Center Rim

#14

Post by drinner-okc » Sun Mar 17, 2013 8:19 pm

About 6 years ago I went to a swap meet, some guys with mostly British parts had a Chrome Star Hub laced to a 2.5x19 rim with a Speedmaster, but bolted to a rear drum (with sprocket). It looked like the earlier pic where the rim stuck out past the sidewall & was ugly. I asked them what it fit & they had no clue. I offered them $25 and they took it. They had the rear backing plate & shoes in a box, I got them to throw that in. I brought it home & tore it all down & laced it to my best 16" rim. Sadly I had to cut the spokes to get it apart.

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