You have to use the correct installation kit, if you research this stuff you will find most Harley wheels interchange, here is an example of the same wheel fitting nearly all Dyna's from 200 to current.
If you can use the same install kit on the 00-05 Dyna AND the 00-07 Softail, obviously the wheel hub is the same.

With Harley you have to be able to read between the lines for interchangeability.

44560-08

16" Rear


Fits '00-later XL (except XL1200X and '11 XL883L) and '00-'05 Dyna® models (except FXDWG).

MSRP US $1,249.95


44566-07

IN-STORE PURCHASE ONLY Contact dealer for pricing and availability.

17" Rear


Fits '00-'07 FXSTD and '06-later Dyna® models (except FXDF and FXDFSE/2).

MSRP US $1,249.95

Wheel installation kit:
43854-08a
rear, 3/4" axle.
$69.95
Fits ’00-’04 XL models, ’00-’05 Dyna models, ’00-’07 Softail
models, and ’00-’01 Touring models.

 

I had to edit what I said before in my original post on the front: I wrote that you can use the narrow 1" bearings with the OEM 1" axle spacers but that is wrong! You need to use the wheel spacers for the 25mm axle with the narrow 1" bearings, my spacers for the 25mm front axle slipped over my 1" axle so I know they would work. I did, however, use the 25mm axle and spacers with the '09 front wheel because the seller just so happened to include it with the wheel. You might find a used 25mm axle washer, nut and spacers cheaper than replacing the bearings and having them installed, unless you have the proper tools to do the install. I would not advise using the 25mm axle on the rear because the brake caliper bore is 1" and it is too loose a fit.

Spacers and axles are the same for the '06/'07 OE mags and Wire wheels and also the same for '08 up mags and wire wheels as far as the SG-SB-Custom and LR are concerned. FB and WG are obviously different for the front and the FB and '10 up WG different on the rear as well.

 

There is no kit going backwards from 25mm to 1". You can get a kit to fit the 1" bearing wheels to the 25mm wheel which is simply a spacer that goes under the narrow bearing, etc.

 

Sometimes it is just not worth the effort to explain, the kits come with multiple spacers and other parts, that is how you adapt the particular wheel to a particular bike/axle.

 

There is nothing to explain, there is no kit to fit a 25mm axle wheel to a 1" axle wheel because there is no narrow H-D 1" bearing. The H-D chrome switchblade wheel, '08 up, is a perfect example of a wheel that is 25mm axle only because it was machined for the narrow 25 mm bearing and they made that same wheel that fit a 1" axle in '06/'07. So if they made a kit to retro fit a 25mm axle to a 1" axle it would be listed for that wheel. You run into the same problem with the OEM '08 up wheels. That is what I am trying to convey.
http://www.harley-davidson.com/gma/g...bmLocale=en_US

 

To install an '09 Fat Boy rear on my '07 Street Bob I used the wide 1in. bearings. Had a machine shop trim the stock outside axle/wheel spacers to fit. I didn't need to replace my rear brake caliper with one for a 25mm axle.
The wider rear wheel required other custom changes, too.

 

Well, why would you fit a 25 mm caliper bracket to a 1" axle anyway?
By the way, in '08 H-D went with a 2 piece floating caliper and an integrated brake switch/banjo bolt @ the master on the rear in place of the fixed one piece caliper. So if you did want to use the 25mm axle on the rear of a pre '08 you would need the Axle-Spacers-Caliper-Caliper Bracket-Brake line and switch/bolt and you can not simply rebuild the '08 up caliper by replacing the piston o-rings, you have to replace each of the pistons.

 

The 25 mm and 1 inch bearings can be swapped. The wheels interchange. If you put 1 inch bearings in a 25 mm rim, or vice versa, you're golden. Exterior daimeter is same. Your axle and bearings will work. You'll have to make sure you have the right shims and spacers.

 

So you have personally done this?
The diameter is the same but the width is 6mm wider for the 1" bearing and the '08 up wheels are not machined to the same depth to accept the wider bearings. Now you can use the Narrow 25mm with a 1" bearing wheel if you use the H-D wheel kit or a 1" x 52mm x 21 mm bearing that is floating around on e-bay.