Dyna Duel Disc mods
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Road Captain
Joined: Jul 2006
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From: Aldergrove BC, Canada
Dyna Duel Disc mods
Planning to undertake the dual disc mods to the 06 Bob and 07 FXD -----in discussion with a well respected forum member, he mentioned going to a smaller front wheel ----- a 17" ----for improved handlng, is there anyone that has changed out the 19 to a 17 and what was the result.
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Joined: Apr 2007
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From: Davie, FL
Many different tires available in 17" vs other sizes
The tire outside diameter does not change and the reason may be just for the better choice of rubber available. We can not make tires & must rely on the different compounds and tire construction available. Ask that person if I am on the right track here and is that the intended meaning? HD just went to front tire on new baggers (17") vs older 16". Before modifying any bike do your research as it costs little for paper and lots for buying mistakes.
Road Captain
Joined: Nov 2008
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I did this on my BMW R1200GS, put on the sport bike 17" wheels (19" front originally).
By lowering the front you change the trail, by a fair amount (on sport bikes they do this by raising the fork tubes in the triple trees).
On the Beemer, it made it turn in much quicker, which I expected and like (almost twichy). Since I ride that bike almost entirely in the canyons its no issue.
Since an FXD has more trail to start with, I would think you would like the impact on steering.
You will, of course, lower the front by an inch or so, which will affect cornering clearance
. (i.e. half of the decrease in wheel diameter). Not an issue for me on the beamer.....might be on an Harley though.
I would also verify I could get matching tires front and rear, or at least know what was available. Some riders have expressed negatives to mismatching tires.
On another note, in adding the dual discs, are you changing the master cylinder as well? I thought of this on my 07 FXD, but it seemed to get awfully pricey (new front wheel, rotor, fork leg, master cylinder, brake caliper, etc).
Post some more detail when you are done.....good luck
Greg
By lowering the front you change the trail, by a fair amount (on sport bikes they do this by raising the fork tubes in the triple trees).
On the Beemer, it made it turn in much quicker, which I expected and like (almost twichy). Since I ride that bike almost entirely in the canyons its no issue.
Since an FXD has more trail to start with, I would think you would like the impact on steering.
You will, of course, lower the front by an inch or so, which will affect cornering clearance
. (i.e. half of the decrease in wheel diameter). Not an issue for me on the beamer.....might be on an Harley though.I would also verify I could get matching tires front and rear, or at least know what was available. Some riders have expressed negatives to mismatching tires.
On another note, in adding the dual discs, are you changing the master cylinder as well? I thought of this on my 07 FXD, but it seemed to get awfully pricey (new front wheel, rotor, fork leg, master cylinder, brake caliper, etc).
Post some more detail when you are done.....good luck
Greg
Last edited by gregbenner; Dec 5, 2008 at 08:27 AM.
Outstanding HDF Member
Joined: Jul 2005
Posts: 2,380
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From: NC
oh man.. another cool mod I'm seeing you dyna's do that I'd never considered back in my softail days except once or twice.. I'm betting going to two discs upfront would do super things to braking capability, huh.
A dual-disc install would be a great diy.. hint hint.
A dual-disc install would be a great diy.. hint hint.
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From: NorNev
Outstanding HDF Member
Joined: May 2008
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From: la
My dual disc and braided lines work great, go for it.
Last edited by paul s; Dec 5, 2008 at 12:31 PM.
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Joined: Apr 2007
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From: Davie, FL
Answering the tire question
Tire case study.
If you look at a Metzler catalog you could see for instance that a:
The weighs are about a pound more for the 19” vs the 17”. (19”/12.79 lbs vs 17” 11.24 Lbs.) The load capacity of the above 17” is 567 lbs vs 584 for the 19”
The 19” will weigh much more due to inertia when the load goes from static to active. Naturally, the both wheels weigh progressively more the faster you go but the larger diameter 19” will always weigh more.
The diameter difference is 26.5 millimeter = 1.043 307 086 6 inch
686 mm (19”)
633 mm (-)
--------------------------
53 mm =
2 ÷
--------------------------
26.5 mm = 1.043 307 086 6 inch
If you wished to convert over to a 17” and used these random example tires (just an example and not an a recommendation) you would need to extend your front end 1” + use a different fender (wider & less diameter) and mount it.
If you look at a Metzler catalog you could see for instance that a:
- IP Code:1124900 ME880 BIAS-PLY120/80-17 TL 61V Maximum Diameter of 633 mm
- IP Code: 1041100 ME880 BIAS-PLY 110/90-19 TL 62H 657 Maximum Diameter of 686 mm
The weighs are about a pound more for the 19” vs the 17”. (19”/12.79 lbs vs 17” 11.24 Lbs.) The load capacity of the above 17” is 567 lbs vs 584 for the 19”
The 19” will weigh much more due to inertia when the load goes from static to active. Naturally, the both wheels weigh progressively more the faster you go but the larger diameter 19” will always weigh more.
The diameter difference is 26.5 millimeter = 1.043 307 086 6 inch
686 mm (19”)
633 mm (-)
--------------------------
53 mm =
2 ÷
--------------------------
26.5 mm = 1.043 307 086 6 inch
If you wished to convert over to a 17” and used these random example tires (just an example and not an a recommendation) you would need to extend your front end 1” + use a different fender (wider & less diameter) and mount it.
Last edited by FastHarley; Dec 6, 2008 at 07:30 AM.
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