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Changing Wheel Sizes

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Old Jul 20, 2019 | 10:50 PM
  #1  
Redneck PaPa's Avatar
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Default Changing Wheel Sizes

I have a 2002 DWG that is mainly stock. I have, however, shortened the rear shocks by 2 inches. Stock 16"rear wheel and 21" front. I recently bought a set of Mags that came off of a 2001 Super Glide (got a good deal on them). 16" rear and 19" front. I have many questions!!! Can I mount a 110/90/19 on the rim without any side bulging problems? Does anyone have an idea what this will do to my handling? I know that going with a smaller wheel and tire will bring the front of my bike down some. Will this make it steadier at speed?
Any help is appreciated.
 

Last edited by Redneck PaPa; Jul 20, 2019 at 10:52 PM. Reason: Im a stickler on punctuation.
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Old Jul 21, 2019 | 09:53 PM
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Yes, you use a 110/90-19 on that 19 x 2.15" rim.

There a few threads on here of people moving to the 19" from their 21" wideglides whether it was a FXDWG or FXST


When you lower the front only, you decrease the "Trail"... That can reduce "Steadiness" (your word )


To add:
If you didn't know already, you'll need Custom Wheel Spacers and a Rotor Spacer to install that Narrowglide wheel in those Wideglide forks.

.
 

Last edited by multihdrdr; Jul 22, 2019 at 12:11 AM.
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Old Jul 22, 2019 | 05:20 PM
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Will the fact that I have 2 inch shorter shocks on the back have an effect on the trail now. As it sits now, the back of the frame (seat area) is lower than the front. If I've done my math correctly my center axle height with the other wheel and tire will be 1.75 inches lower then I am now. In my head, I'm thinking that should put me back to factory settings but lower to the ground.
 
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Old Jul 22, 2019 | 05:33 PM
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Originally Posted by multihdrdr
Yes, you use a 110/90-19 on that 19 x 2.15" rim.

There a few threads on here of people moving to the 19" from their 21" wideglides whether it was a FXDWG or FXST


When you lower the front only, you decrease the "Trail"... That can reduce "Steadiness" (your word )


To add:
If you didn't know already, you'll need Custom Wheel Spacers and a Rotor Spacer to install that Narrowglide wheel in those Wideglide forks.

.
When you lower the front only, you decrease the "Trail"... That can reduce "Steadiness" (your word )


multihdrdr, will the fact that the shocks that are on the rear now are 2 inches shorter than stock have an effect on the trail?

In my mind, and if I've done the math right, my center height with the 19-inch wheel and tire on will be 1.75 inches shorter than it is right now. I think this will bring the set up of the bike close to what it was before I shortened the shocks, but closer to the ground.
 
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Old Jul 22, 2019 | 10:03 PM
  #5  
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Every time you move one of the suspension components (shocks) up or down your changing the steering characteristics of the bike. Depending on how much you move, it may have no effect, it might have a positive effect or if might have a negative effect....In my experience I have found that doing both front and back at the same time gave me better results then just dropping the *** end...
 
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Old Jul 22, 2019 | 10:05 PM
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Originally Posted by Redneck PaPa
I have a 2002 DWG that is mainly stock. I have, however, shortened the rear shocks by 2 inches.
Why? That will only increase the steering rake and trail, and reduce the cornering clearance, of a motorcycle that already has too much rake and trail, and too little cornering clearance.

Stock 16"rear wheel and 21" front. I recently bought a set of Mags that came off of a 2001 Super Glide (got a good deal on them). 16" rear and 19" front. I have many questions!!! Can I mount a 110/90/19 on the rim without any side bulging problems?
There are no good road tires available in 16", 19", or 21" sizes. This is the year 2019- there's no need to use bias-ply tires. We've been using tubeless radial tires in 17" sizes for many many years now.

Does anyone have an idea what this will do to my handling? I know that going with a smaller wheel and tire will bring the front of my bike down some. Will this make it steadier at speed?
Any help is appreciated.
If your motorcycle suffers from a lack of directional stability, it is not caused by any of the geometry, wheel, or tire numbers that have been discussed. The stock 2002 FXDWG has a wheelbase of 66.1", 32 degrees of steering rake, and 5.1" of trail. That would be the equivalent of the directional stability of the TI Asia super tanker. Any lack of stability on that motorcycle, is not caused by the geometry- it is either caused by attempting to use the handlebars as an attachment point (due to lack of proper formal rider training and/or the ergonomic problems inherent to the design deficiencies of the motorcycle) and/or by the lack of rigidity caused by the flaccid mild steel tubular frame and fork.
 

Last edited by XRX; Jul 22, 2019 at 10:06 PM.
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