Tire Sizing - how many out there stray outside the specs? - Victory Forums - Victory Motorcycle Forum
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post #1 of 28 (permalink) Old 10-24-2017, 12:38 PM Thread Starter
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Default Tire Sizing - how many out there stray outside the specs?

Hey all, so since I bought my bike in Jan of this year with 5700 miles on it and about 1/2 the tread gone.. it now has 11,500 and looks like time for it's (my) first tire change..

I noticed the guy that had it before me had put what looks to be a larger tire on the rear when I compare them to what in my service manual..

2005 Victory Vegas 8-Ball
Service Manual:
Rear - Dunlop D417 180/55-B18 74V

Actually on the bike:
Rear - Dunlop E3 200/50 R18 76H

**Ignoring front for this discussion since the front tire is to spec***

But for the rear I'm wondering.. I've never witnessed any rubbing or odd feeling/smell that would indicate the tire is hitting the swing arm or rubbing after tire warm up however it is rather close... I realize it's very stupid to ask anyone on this forum to stray from anything that the service manual tells you.. since we obviously realize you make that decision solely at your own risk.. but I'm wondering since I've driven this bike with no issues for 5000ish miles would/could it be safe to say that I can slap another one of these "out of spec" but slightly wider and "cooler" looking tires right back on..? or did I just get lucky and I'm asking for trouble if I cont with this out of spec setup; should I go back to the 180...? The guy did chop the back fender a bit so the rear tire is slightly more visible than the ave Vegas - this is truthfully the only reason I'm asking this.. worried the bike will look odd with a skinny back tire that's more exposed.

looking for advice and what others out there have possibly done in similar situations/scenarios.



Thanks

2005 Victory Vegas 8 Ball
S&S Air Intake
FMB Chopper Custom Drag Bars - 4" straight rise, 2" pull back
Dead Creek Cycles Solo Swing Arm Bag
Conquest Customs - Ground Pounder Exhaust
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Port Saint Lucie Florida
Been riding for 21 years
Previously Owned Bikes:
Suzuki GS750E (1st Bike)
Honda Aero 750 (2nd)
Triumph Daytona 675 (3rd)
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post #2 of 28 (permalink) Old 10-24-2017, 01:46 PM
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I've got a car tire on back and a rear tire on front...so I know you're not asking me.
BBob, streetdoc432 and SkInM4N like this.

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post #3 of 28 (permalink) Old 10-24-2017, 01:49 PM
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But in all seriousness...if you don't see any evidence of the tire rubbing on the swing arm and you've ridden the shit out of it - I don't see why you couldn't just keep on keepin' on.

But I'd look real close.

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post #4 of 28 (permalink) Old 10-24-2017, 02:36 PM
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Bike came with a 180/60R16 but I installed a 180/65B16. No issues.
(waiting for the "OMG bias and radial, oh noes!" crowd)



2013 XCT, Boardwalk Blue w/ Vicwrapz
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post #5 of 28 (permalink) Old 10-24-2017, 03:00 PM
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A 200mm tire is designed for a 6" rim. By putting it on your 5" rim it will wear funny as it is being 'pinched' by the rim and it won't really be 200mm wide once mounted and rounder in profile than designed.

Visually, the 200 tire will not look any wider than a 180... the difference in tire width is 20mm and the rim is pinching the tire by 25mm...

You can do a radial rear and a bias front no problem. Some bikes come from the factory like that. It is not advisable to use a bias rear and a radial front.

2006 Victory Kingpin
Lloydz 116" Stroker/Big Bore, .495 Cams, Torque Tubes Airbox,
RPW Thor Pipe, Lloydz ECU Flash, PC-III, PTS (-2), Rivera
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Last edited by half_crazy; 10-24-2017 at 03:11 PM.
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post #6 of 28 (permalink) Old 10-24-2017, 03:18 PM
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Quote:
Originally Posted by half_crazy View Post
It is not advisable to use a bias rear and a radial front.
I've heard this many times, but never really found out the 'why'. I chose it because it has a higher load rating. Why is it ill-advised? (not being a smart ass, trying to learn something here...)



2013 XCT, Boardwalk Blue w/ Vicwrapz
S&S Cams, Lloydz filter & ATS +3, PCV, UD pulley, Alto Red Eagle clutch plates
Madstad Windshield, 5000K HID, TriOvals, Memphis Shields wings, Ultimate seat
JVC KD-X35MDT, PBR300X4, Polk DB6502, DaytonAudio ND140-4 rear
HyperLites, LED driving lights, Lloydz dyno 105+H and 117+T
Arlen Ness blinkers, KlockWerks KlipHanger bars, Avon grips

Spectro Golden 4 20w40 for Victory L.SG424, Kury Sabertooth LEDs
THE FEW, THE PROUD, THE OBSCURE. TTWFO2
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post #7 of 28 (permalink) Old 10-24-2017, 03:37 PM
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Quote:
Originally Posted by broggyr View Post
I've heard this many times, but never really found out the 'why'. I chose it because it has a higher load rating. Why is it ill-advised? (not being a smart ass, trying to learn something here...)
Do you have a radial up front?

A radial front and bias rear has been known to create dynamic instability. Even on cars, this has been a rule of thumb for a long time.

You can get radials with an 80 load rating....

2006 Victory Kingpin
Lloydz 116" Stroker/Big Bore, .495 Cams, Torque Tubes Airbox,
RPW Thor Pipe, Lloydz ECU Flash, PC-III, PTS (-2), Rivera
Primo Clutch Spring, 31 Tooth Pulley w/Buell Belt.
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post #8 of 28 (permalink) Old 10-24-2017, 04:36 PM
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Quote:
Originally Posted by half_crazy View Post
Do you have a radial up front?

A radial front and bias rear has been known to create dynamic instability. Even on cars, this has been a rule of thumb for a long time.

You can get radials with an 80 load rating....
I do have a radial up front. The rear has a load rating of 81, which is why I selected it.



2013 XCT, Boardwalk Blue w/ Vicwrapz
S&S Cams, Lloydz filter & ATS +3, PCV, UD pulley, Alto Red Eagle clutch plates
Madstad Windshield, 5000K HID, TriOvals, Memphis Shields wings, Ultimate seat
JVC KD-X35MDT, PBR300X4, Polk DB6502, DaytonAudio ND140-4 rear
HyperLites, LED driving lights, Lloydz dyno 105+H and 117+T
Arlen Ness blinkers, KlockWerks KlipHanger bars, Avon grips

Spectro Golden 4 20w40 for Victory L.SG424, Kury Sabertooth LEDs
THE FEW, THE PROUD, THE OBSCURE. TTWFO2
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post #9 of 28 (permalink) Old 10-24-2017, 05:49 PM
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I'd say run the same you have now if you didn't have any problem. Sure looks better than a skinny tire. Of course, being a bit pinched doesn't give you the full 200 effect, but still better I'm sure.

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post #10 of 28 (permalink) Old 10-24-2017, 05:51 PM
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Quote:
Originally Posted by broggyr View Post
I do have a radial up front. The rear has a load rating of 81, which is why I selected it.
The OEM rear tire is 80 load-rated. The 81 load-rating only adds 27 pounds more weight capacity in exchange for a stiffer and heavier tire with a bias ply carcass. Is it worth it?

2006 Victory Kingpin
Lloydz 116" Stroker/Big Bore, .495 Cams, Torque Tubes Airbox,
RPW Thor Pipe, Lloydz ECU Flash, PC-III, PTS (-2), Rivera
Primo Clutch Spring, 31 Tooth Pulley w/Buell Belt.
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