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Harley Riders USA Forums » Harley Davidson Motorcycle Models » Custom and Special Construction » Tire size verses rim width issues


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Old 08-09-2011, 07:35 PM Top   #1 (permalink)
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Default Tire size verses rim width issues


Okay here's one of my current di-lemmas...

I wanted an 18" x 4" custom front wheel for my Rocker. According to the Manufacturer they could only make an 18" x 3.5", but he assured me the 150 tire I wanted to mount would fit.

Problem: Today when I took it to the cycle shop, the guy there said he tried, but the tire wouldn't fit the rim width, becuz' it's too low a profile (150/60/18, Front tire).

Opinions & Recommendations sought. Should I get a 150/170/18 Rear tire, and try to have it mounted backwards ? Or should I get a 140/80/18 Rear and mount it backwards ? Or should I get a 140/70/18 Front tire and have it mounted? From my research, those appear to be my alternatives at this point.

Thanks for any & all help folks. Someday I'll get 'er done and post pics.

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Old 08-09-2011, 09:28 PM Top   #2 (permalink)
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I will be no help but looking forward to the pics...
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Old 08-09-2011, 10:38 PM Top   #3 (permalink)
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150/60 will fit on , we have done it & its no hassle. The guy is full of shit.

But you can get a higher profile 150, I'm out all day but I'll try to find you a link later as the 60 profile isn't ideal.

There are other options that sound weird but do look fat, like the 120 Conti

But avoid rears if you can, it's not an ideal solution
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Old 08-10-2011, 08:55 AM Top   #4 (permalink)
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Cant get a 150/70/18 front tire ?

A 150 should fit a 3.5" rim, but you may need to go 70 or 80 profile. I have a 140 mounted on my stock 3" back rim.
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Old 08-10-2011, 10:24 AM Top   #5 (permalink)
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Quote:
Originally Posted by sk8rod View Post
150/60 will fit on , we have done it & its no hassle. The guy is full of shit.

But you can get a higher profile 150, I'm out all day but I'll try to find you a link later as the 60 profile isn't ideal.

There are other options that sound weird but do look fat, like the 120 Conti

But avoid rears if you can, it's not an ideal solution
Pete,
I'm stuck in FSO, flight delays & lousy WIFI. I will try to find another tire / MC shop; don't have much faith in our 2 local HD dealers, and the near-by "Custom" shop is the guy who tried and said he couldn't get it to work. *Of course he called one of the local HD dealers asking for any tips on how to get it to fit, and they said they weren't sure if it could be done or not.

I love the look of this tire (150/60/18 Front). It was designed for the Honda Rune but looks like it was made for my Rocker
I will get another tire, with a higher profile, if I have to and that would work... although that's not preferred if I can locate a Talented Mechanic who can mount this puppy to this 3.5" rim.

Micah,
I'll post pics when I make some progress. You made us WAIT until you was ready to reveal your Masterpiece. I'm gonna wait until mine's rideable.

Wideglide,
*Sorry forgot your first name, I've looked but can't find any other 150- -18 Front tires. I'd take a 60, or 70, or even an 80 or 90. Just ain't found one.... although I gotta say, the 60 profile.

Gotta run, callin' my flight.
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Old 08-10-2011, 07:36 PM Top   #6 (permalink)
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Typo, I meant to type SFO, as in San Francisco Int. not FSO -

I'll be home later and start calling other places, to see if I can find someone to mount my 150/60/18 to my 18" x 3.5" rim. I'll update as things develop.

Any leads or tips to help accomplish this would sincerely be appreciated.

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Old 08-10-2011, 10:28 PM Top   #7 (permalink)
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Hey man, got in late last night. Shoot me a mail later and I'll get on it
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Old 08-22-2011, 07:46 PM Top   #8 (permalink)
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Well to close-out this thread....

I mounted a 140-80-18 Bridgestone "Battle-Axe" Rear tyre on my front rim. Because I could not find someone capable of mounting the low profile 150-60-18 om my 18 x 3.5" rim.

And although I had read in many articles that rear tyres should be mounted backwards when placed on a front rim, because rears are designed to have constant acceleration forces. After thinking about the matter in-depth, I believe that rear tyres are not only designed/constructed to take constant acceleration forces, they are equally capable, via design & construction, to take standard rolling & stopping forces. Hence the critical point (in my feeble mind - - ) is the tread pattern design. Which of course, when rolling forward would push water out to help maintain traction on wet surfaces. And therefore if mounted backwards, the tyre would instead push water in-wards and increase the liklihood of hydro-planing. So I had it mounted in the normal direction (or that's my claim, cuz' the guy mounting it forgot, and he also screwed-up and didn't mount the valve at the little painted dot too).

If anyone wants to provide their thoughts/rationale on how that's dangerous, I'm open to having it removed & remounted.
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Old 08-23-2011, 10:18 AM Top   #9 (permalink)
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no

rears are designed to take heavy loading in acceleration,, its critical.

there are some tires that can run either rotation, the Cobra for instance,

However you should shoot the tire Co an email and check,,
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