Front tire 90/90/19 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 24 (permalink) Old 04-18-2008, 08:15 AM Thread Starter
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Front tire 90/90/19

Hey guys, local Harley Shop 50 miles away only has a Dunlop 90/90/19 handy that I could put on my bike...well, they do have a 100/90/19 Maxxis but I don't like it.

Okay, so stopping power and rubber on the road for cornering would be reduced somewhat. Any real problem I should consider if I go with the 90/90/19?

I'm thinking I'd like to find a car tire for the rear when the time comes and when the power is churning the narrower front might be more agreeing...and find an easy groove to slice.

Boy, gotta be a rear car tire out there somewhere. What about the old "English Fords," anyone know of any car that used a 3 1/2 or 4 in. rim? Anyhow, east coast, west coast, overseas, Timbuktu, and then I still have the Southern hemisphere, after that...I can go see the Gods about it.

Oh yeah, back, if I go with a 90/90/19 front tire is it a sure fire death wish or not much of a problem?
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post #2 of 24 (permalink) Old 04-18-2008, 10:58 AM
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With a 100/90-19 our speedometer are about 5-10% off on the low side. A 110/80-19 makes them pretty accurate. With a 90/90-19 your speedometer is going to be even more off

As far as handling, that can vary by tire so it's hard to tell 100/90-19 by different manufacturers will corner and grip differentlt based on composition.

As far as the rear tire and using a car tire.. IF you do go with one look for something along the lines of a volkswagon tire. Bear in mind that car tires handle different then motorcycle tires especially in the area concerning the sidewall. They usually do not flex as much on cornering but do have more surface contact on the straights

Dianna
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2000 VN750 Sere (Serendipity)
1990 GL1500 (Ole Blue)
1986 VN750 EVie (project bike, heavy custom)
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post #3 of 24 (permalink) Old 04-18-2008, 02:38 PM Thread Starter
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Cool! Unless I can uncover any overwhelming concern I think I will go with the smaller front tire. Always been more of a chopper type guy anyway. Hopefully, a 90/90/19 will also be on the low, low side since tickets are rather expensive.

On using a car tire for the rear...google found a 165R15 will fit a 4" to 5.5" Rim...I'll start checking around at some old salvage yards, some of those guys probably have seen a lot of car rims in their lifetime.

Last edited by one2; 04-18-2008 at 02:46 PM.
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post #4 of 24 (permalink) Old 04-18-2008, 03:00 PM
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Mounting a car tire on the rear and mounting a car rim on the rear are two completely different animals, unless you know some trick to hooking up the rear brake and the final drive to just any rim..
Plus you can't go too wide or you run the risk of the tire rubbing against your swingarm.
I would think you would be looking for a tire that would fit on your existing rear end and rim

Dianna
Conway, AR
Patriot Guard Rider
2000 VN750 Sere (Serendipity)
1990 GL1500 (Ole Blue)
1986 VN750 EVie (project bike, heavy custom)
VROC # 11628 / 25000-H
ARVROC # 12 Coordinator and Crowd Control
OKVROC # 18 (H)
TNVROC # 45 (H)
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post #5 of 24 (permalink) Old 04-18-2008, 03:52 PM
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so, on our bikes with the 100/90, the speedometer will read 50 but we are really going about 45-47 mph? or do I have that backwards? it will read 50 and we wille be traveling at 52-55 mph? and it will be more accurate with the 110/90? hmm.. I may have to borrow my buddy's gps for a short ride...

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post #6 of 24 (permalink) Old 04-18-2008, 04:03 PM
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with the 100/90 if the speedo is saying 50 you are probably closer to 45-47. with a 110, if the speedo says 50, you are probably doing 50 or darn close to it

Dianna
Conway, AR
Patriot Guard Rider
2000 VN750 Sere (Serendipity)
1990 GL1500 (Ole Blue)
1986 VN750 EVie (project bike, heavy custom)
VROC # 11628 / 25000-H
ARVROC # 12 Coordinator and Crowd Control
OKVROC # 18 (H)
TNVROC # 45 (H)
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post #7 of 24 (permalink) Old 04-18-2008, 09:22 PM Thread Starter
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Quote:
Originally Posted by Dianna View Post
I would think you would be looking for a tire that would fit on your existing rear end and rim
Yes, that's what I meant. I'm thinking there are a lot of different cars in the world, and if an old, old salvage yard guy ever remembered seeing any extra narrow (3 1/2 - 4" wide) Rims on any car I could start looking at tires that would fit such a vehicle, if there is one. When I go back to the bike shop I'll take some measurements of the rear tire and see how close it can be gotten to in car size.
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post #8 of 24 (permalink) Old 04-20-2008, 08:50 AM Thread Starter
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Maybe if I keep searching "Darkside Tires" I might run across a VN750 owner that has already converted the rear tire...or at least tried to do so. 165R15 will fit a 4" Rim...but a 3 1/2" Rim...Problem?

Tire Size Comparison

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
165/80-15 5.2in 12.7in 25.4in 79.8in 794 0.0%
150/80-15 4.7in 12.2in 24.4in 76.8in 825 -3.7%

And since I've read a 170/80-15 will fit the VN700:

Tire Size Comparison

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
165/80-15 5.2in 12.7in 25.4in 79.8in 794 0.0%
170/80-15 5.4in 12.9in 25.7in 80.8in 784 1.2%

http://www.miata.net/garage/tirecalc.html

Last edited by one2; 04-20-2008 at 09:02 AM.
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post #9 of 24 (permalink) Old 04-21-2008, 09:08 PM
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Quote:
Originally Posted by one2 View Post
<snipped>
And since I've read a 170/80-15 will fit the VN700:

<end snip>
I've been running a 170/80-15 on my 750 for something over 10K miles now; just replaced the first one, a Dunlop 404, with a Metzler ME880. I like the Metzler much better than the Dunlop; doesn't try to hang up in the parallel-to-the-road expansion joints like the Dunlop did.

A 170 is about the max that will fit a 3" rim safely; Honda switched to a 170 from the original 160 on the Shadow Spirit, I think it was, a few years back. Several BUBF riders went to a 170 a few years ago; that's how I knew it would fit, the only holdback being whether or not it would rub on the VN750 swingarm (it doesn't). The BUBF (VN1500A) uses the same tire sizes and rim widths as the VN750.

Jim

J.D.
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'95 Vulcan 750 "Therapy II",
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post #10 of 24 (permalink) Old 04-24-2008, 08:35 AM Thread Starter
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Comparing the two sizes the car 165/80-15 seems smaller all around than the motorcycle 170/80-15 tire. Would be interested to find out if this is true in an actual comparison. Maybe the mid-girth and Rim to Rim lip distance would make it unsuitable for replacing the 170 with a car 165 on a 3 1/2 Rim.


Specification***Sidewall****Radius**Diameter**Circ umference***Revs/Mile

165/80-15******5.2in*****12.7in****25.4in****79.8in****** *794 0.0%
170/80-15******5.4in*****12.9in****25.7in****80.8in****** *784

Difference: 170/80-15 is 1.2% bigger than 165/80-15.
---

Also, found I can order a 100/90-19 ME 880 online and shipped cheaper than the Dunlop 90/90-19 at the local Harley shop. Being a cheap-o, I'll probable order the better tire at a better price online. I've probably got a couple of seasons before I will need to replace the rear, so no hurry there, and I should know a little more of Darksiding the VN700 by then.

Noticed I was low on oil (Unknown brand in bike) yesterday while out riding. Came home and installed new filter and went with Shell's Rotella T 15W-40...for diesels they think...read some good stuff about this new "Triple Protection" oil though.
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