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  #1 (permalink)  
Old 03-08-2006, 04:13 PM
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Bike Year, Make, Engine: 1999 Harley Davidson Fatboy
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Bigger Rear Tire on 1999 Fatboy

Gonna do some major mods to my 1999 Fatboy this year. One of which is to go with a slightly larger rear tire on the back. I have a 130 back there now. From what I understand I can probably go up one size (140) without any trouble, two sizes (150) by grinding the lips off of the fenders and possibly trimming the belt guard(s).

First off, can anyone verify this info.?

Second, can I go bigger by going chain drive and different fender?

I plan on going with a completely different fender anyway.

I do know they make kits out there to run 200+ rear tires on Softails, but I don't want to spend $2500 on this project and I'm not really a fan of big tire bikes. I just want something that'll look good once I bob the rear fender.

Thanks in advance!
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  #2 (permalink)  
Old 03-08-2006, 04:18 PM
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Remember the Marlboro Man bike? That had a chopped fender and a stock rear wheel and tire. The tire was a Continental 130 if I remember correctly.

That bike looked cool...
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  #3 (permalink)  
Old 03-08-2006, 04:21 PM
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Hell yeah!

I just want to go a little fatter. So far 150/80/16 seems to be my limit, but I'm not even sure if that'll work with just fender/belt guard trimming.

Oh yeah, forgot to ask, will the 150 fit on Heritage spokes? I believe they're either 3" or 3.5" wide.
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Old 03-08-2006, 04:26 PM
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You will have to switch to a skinny rear belt and skinny rear pulley to go to a 150... LOTS of work for very little bigger tire... you will have to pull the primary and swing arm to switch the belt...

I think if ya switch to a chain you gan get a 180 in but you will need a wheel too...

Check out D&M conversion kits too...
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Old 03-08-2006, 04:52 PM
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This might give you a few ideas...I'm considering going to 18" spokes on my Fat Boy to replace the 16"s on there now.

http://hotrodsbikeworks.com/tech/0507hrb_tire/
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Old 03-08-2006, 05:06 PM
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Thanks for the info, but two things...

I'm want to stick with 16's because I want that beefier & taller tire look like Exile's bikes. Know what I mean?

Second they used a 160 x 18, but it's contact patch was very rounded. I'm thinking that it allows room for the tire to fit as opposed to a 150+ x 16 tire that is flatter.
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Old 03-08-2006, 06:06 PM
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Re: Bigger Rear Tire on 1999 Fatboy

Quote:
Originally posted by Candy Azz
Gonna do some major mods to my 1999 Fatboy this year. One of which is to go with a slightly larger rear tire on the back. I have a 130 back there now. From what I understand I can probably go up one size (140) without any trouble, two sizes (150) by grinding the lips off of the fenders and possibly trimming the belt guard(s).

First off, can anyone verify this info.?

Second, can I go bigger by going chain drive and different fender?

I plan on going with a completely different fender anyway.

I do know they make kits out there to run 200+ rear tires on Softails, but I don't want to spend $2500 on this project and I'm not really a fan of big tire bikes. I just want something that'll look good once I bob the rear fender.

Thanks in advance!
Alot of work going to a chain ,why not get rid of the belt guards,go with a 140 tire ,If no one rides on the back,go with a springed solo seat a bobbed rear fender mounted real close to the tire ,welded to the swing arm.
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Old 03-08-2006, 06:47 PM
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I put a 140 on the back of mine using my stock components with very little bucks. Most softail swingarms have a little space between them and the axle spacers. All I had to do was add around an extra 3/16" or so to the axle spacer on the left drive side, it was tight but I got it in there. I also used some thin pulley spacers that were used on the earlier FL models, sandwiched a couple of them between the hub and pulley, and the belt trued itself up on the outside of the trany pulley (a little wider than the stock belt) perfectly when the wheel was centered correctly.

The stock width 16" HD wheel will work fine with a 150 tire as well. HD's running 150s on several of their sportier models these days using the same wheel, but I believe the older Evo Softail frames are spaced differently than the TC's version.

I can only vouch for a 140 to still clear your stock goodies...
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Old 03-08-2006, 06:54 PM
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The clearance problem is between the tire and the wide belt...
Stick your finger between the 130 tire and the belt...

I am riding on a 130 and all I can see while riding the bike is the tank and bars... the back tire is just for the people behind you to look at...
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Old 03-08-2006, 07:15 PM
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Quote:
Originally posted by BigMikeSimpson
... the back tire is just for the people behind you to look at...
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Old 03-08-2006, 07:18 PM
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A 150 is very do-able but as others have said the belt to tire clearance is your main concern. You will have to move the rear tire to the right to get it all in there. I usaully mill .200 from the rear brake bracket and add that back to the wheel spacers on the left side. You will also need to run a .200-.250 rear pulley spacer to get the belt to clear the tire. HD runs the stock rear wheels offset .200 from the factory so in effect you are putting it back in the center. Using the bobbed fender will make it easier but we have a 160x18 under a stock rear fender on my parts guys 95 Fatboy.
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Old 03-08-2006, 07:29 PM
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Quote:
Originally posted by pushrod243
A 150 is very do-able... we have a 160x18 under a stock rear fender on my parts guys 95 Fatboy.
Like he said! Yeah, when looking at the rear wheel on my Fatboy before spacing things out for the 140, I noticed it was actually a little off center to the left, thought is was just the fender slightly out of line from the factory. After shimming the left side, it actually straightened it all up perfectly.
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Old 08-31-2022, 11:08 PM
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Quote:
Originally Posted by BigMikeSimpson View Post
You will have to switch to a skinny rear belt and skinny rear pulley to go to a 150... LOTS of work for very little bigger tire... you will have to pull the primary and swing arm to switch the belt...

I think if ya switch to a chain you gan get a 180 in but you will need a wheel too...

Check out D&M conversion kits too...
First post on the forum, and yes, I know this thread is 16 years old, but it has info pertaining to a 1998 Fatboy I'm looking to possibly buy.

I know where I can buy two separate sets of billet wheels for it. One set has a rear 18x4.25 wheel with a 150/70/18 tire, and the other set has a rear 18x5.5 wheel w/ unknown tire size as of right now. (Waiting for email response)

I know I can make the 18x4.25 wheel with the 150 tire work after reading this thread, but I'm wondering if I can get the 18x5.5 wheel with a 180 tire on it to work on a 1998 Fatboy if I switch to a chain, being I'm quoting this post that mentions a 180 with a chain will fit, but requires work.

Thanks for any advice.
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Old 09-02-2022, 09:20 AM
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It will work, but you will have to modify the rear fender or go super small fender.

It really depends on how much you want to do.

You can use this site as a reference,
https://heartlandbiker.com/collections/softail-models-1

I like them, because they give you a good view of the pictures.
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